WO1997041868A1 - Oral contraceptive - Google Patents

Oral contraceptive Download PDF

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Publication number
WO1997041868A1
WO1997041868A1 PCT/US1997/007074 US9707074W WO9741868A1 WO 1997041868 A1 WO1997041868 A1 WO 1997041868A1 US 9707074 W US9707074 W US 9707074W WO 9741868 A1 WO9741868 A1 WO 9741868A1
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WO
WIPO (PCT)
Prior art keywords
days
combination
administered
estrogen
progestin
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PCT/US1997/007074
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French (fr)
Inventor
Michael Jay Gast
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American Home Products Corporation
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Priority to AU28158/97A priority Critical patent/AU2815897A/en
Publication of WO1997041868A1 publication Critical patent/WO1997041868A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/565—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids not substituted in position 17 beta by a carbon atom, e.g. estrane, estradiol
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/565—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids not substituted in position 17 beta by a carbon atom, e.g. estrane, estradiol
    • A61K31/567—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids not substituted in position 17 beta by a carbon atom, e.g. estrane, estradiol substituted in position 17 alpha, e.g. mestranol, norethandrolone

Definitions

  • oral contraceptives consist of a combination of a progestin and estrogen that are administered concurrently for 21 days followed either by a 7 day pill free interval or by the administration of a placebo for 7 days in each 28 day cycle.
  • the most important aspects of a successful oral contraceptive product are effective contraception, good cycle control (absence of spotting and breakthrough bleeding and occurrence of withdrawal bleeding), and minimal side effects.
  • Combination oral contraceptives have traditionally acted by suppression of gonadotropins.
  • the progestin component is primarily responsible for contraceptive efficacy through inhibition of ovulation, and other peripheral effects which include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation).
  • the estrogenic component intensifies the anovulatory effect of the progestin, and is also important for maintaining cycle control.
  • Levonorgestrel is the biologically active moiety of racemic norgestrel. It is strongly progestational, has no inherent estrogenic activity, is antiestrogenic, and possesses good biologic activity. The contraceptive effects of levonorgestrel are manifested throughout the hypothalamic- pituitary-gonadal-target organ axis.
  • Ethinyl estradiol is the estrogen most frequently used in combination OCs.
  • the dosage of EE in marketed OC formulations has been steadily reduced from that found in earlier OCs.
  • Thromboembolic mortality decreased when the amount of synthetic estrogen in OC formulations was reduced from 100 ⁇ g to 50 ⁇ g.
  • a significant reduction in fatal myocardial infarctions was reported for women using OCs with 30 ⁇ g of EE rather than 50 ⁇ g of EE. [Meade TW. Br Med J 280:1157 (1980)].
  • progestin/estrogen combination is administered either as a fixed dosage combination (monophasic) or as biphasic or triphasic regimens in which the dosage of the combination is varied either once or twice throughout the menstrual cycle.
  • the progestin/estrogen combination is typically administered for 21 days followed by either a 7-day pill free period or the administration of a non-contraceptive placebo (or iron supplement) for 7 days.
  • 3-ketodesogestrel (3-KDSG), desogestrel (DSG), levonorgestrel (LNg), gestodene (GTD), norgestrel (NG), and norethindrone (NE) are typically used as the progestin while ethinyl estradiol (EE); 17 ⁇ -estradiol, and mestranol are typically the estrogenic components.
  • Erlich German Patent DE 4,104,385 CI and U.S. Patent 5,280,023 discloses sequential contraceptive regimens consisting of the administration of an estrogen which effects a disturbance of follicle stimulation, followed by the administration of a combination of a progestin/estrogen in a dose at least adequate to inhibit ovulation.
  • the regimen is administered for a total of 28 days per cycle. It is preferred that the estrogen is administered for 5-14 days per cycle and the progestin/estrogen combination is administered for 23-14 days per cycle, so that the total administration is for 28 days per cycle.
  • Specific regimens include (a) 4 mg estradiol for 7 days followed by 21 days of the combination of 1 mg norethisterone acetate and 4 mg estradiol; (b) 2 mg estradiol valerate for 7 days followed by 21 days of the combination of 2 mg chlormadinone acetate and 4 mg estradiol valerate; and (c) 20 ⁇ g EE followed by 18 days of the combination of 150 ⁇ g LNg and 20 ⁇ g EE.
  • Regimen (c) in Erlich provides a total steroidal load of 2.7 mg of LNg and 560 ⁇ g EE per 28 day cycle.
  • Lachnit (PCT Publication WO 95/26730) discloses bridged regimens consisting of the administration of a combination of a progestin/estrogen combination (50 - 125 ⁇ g LNg and 10 - 40 ⁇ g EE) for the first 23-24 days of the menstrual cycle followed by the administration of an estrogen (2 - 40 ⁇ g EE) for 4-10 days for a total administration of at least 28 days per cycle.
  • the use of 100 - 300 ⁇ g drospirenone and 10 - 40 ⁇ g EE as the 23-24 day progestin/estrogen combination is disclosed.
  • Lachnit also discloses a triphasic plus bridging regimen (4-9 days, 4-9 days, 9-13 days, and 28 days for the three phases and estrogen phase, respectively) in which a combination of 50 ⁇ g LNg and 20 ⁇ g EE are administered in the first phase, a combination of 75 ⁇ g LNg and 25 ⁇ g EE are administered in the second phase, a combination of 100 ⁇ g LNg and 20 ⁇ g EE are administered in the third phase, and 10 ⁇ g EE is administered in the estrogen phase.
  • Other progestins disclosed include GTD, DSG, 3-KDSG, DRSP, cyproterone acetate, norgestimate, and norethisterone.
  • Moore discloses bridged triphasic regimens consisting of the administration of a combination of 10 - 50 ⁇ g LNg and 5 - 20 ⁇ g EE from days 1-7 of the menstrual cycle; of 50 - 75 ⁇ g LNg and 5 - 20 ⁇ g EE from days 8-14 of the menstrual cycle; of 75 - 125 ⁇ g LNg and 5 - 20 ⁇ g EE from days 15-21 of the menstrual cycle; and 5 - 20 ⁇ g EE from days 22-28 of the menstrual cycle.
  • WO 95/17194 discloses contraceptive regimens which consist of the administration of a combinaton of a progestin (50 - 75 ⁇ g GTD, 75 - 125 ⁇ g LNg, 60 - 150 ⁇ g DSG, 60 - 150 ⁇ g 3-KDSG, 100 - 300 ⁇ g DRSP, 100 - 200 ⁇ g cyproterone acetate, 200 - 300 ⁇ g norgestimate, or >350 - 750 ⁇ g norethisterone) and an estrogen (15 - 20 ⁇ g EE or 2 - 6 mg 17 ⁇ -estradiol) for 23-24 days per cycle.
  • a progestin 50 - 75 ⁇ g GTD, 75 - 125 ⁇ g LNg, 60 - 150 ⁇ g DSG, 60 - 150 ⁇ g 3-KDSG, 100 - 300 ⁇ g DRSP, 100 - 200 ⁇ g cyproterone acetate, 200 - 300 ⁇ g
  • Upton Upton (EP Patent Specification 253,607 Bl) teaches the use of low dose progestin/estrogen combinations for combined hormone replacement therapy and contraception in climacteric women.
  • Climacteric women are defined in Upton as pre- menopausal women around 40 years of age whose hormone levels are waning. The climacteric woman still ovulates (albeit may have irregular ovulation), but she still experiences many of the symptoms of the hypoestrogenic menopausal woman, such as insomnia, hot flushes, and irritability.
  • Upton teaches the administration of a 23-26 day monophasic regimen of progestin/estrogen followed by a pill free or placebo interval of 2-5 days; with 24 days of progestin/estrogen administration followed by a 4-day pill free or placebo administration being preferred.
  • Upton teaches the use of a progestin selected from 25 - 100 ⁇ g LNg, 10 - 70 ⁇ g GTD, 25 - 100 ⁇ g DSG, 25 - 100 ⁇ g 3- KDSG, and 85 - 350 ⁇ g NE used in combination with an estrogen selected from 500 - 2000 ⁇ g 17 ⁇ -estradiol, 8 - 30 ⁇ g EE, and 15 - 60 ⁇ g mestranol.
  • Upton Based on relative potencies, Upton teaches that a dose of 75 ⁇ g LNg is equivalent to 35 ⁇ g of GTD, 75 ⁇ g of 3-KDSG or DSG, and 250 ⁇ g NE and that a dose of 1000 ⁇ g of 17 ⁇ -estradiol is equivalent to a dose of 15 ⁇ g EE and 30 ⁇ g mestranol. Upton also teaches that NG may be substituted for LNg, but at twice the dose.
  • Sartoretto (Clinica e Terapeutica 3: 399 (1974)) discloses a monophasic contraceptive regimen consisting of the administration of a combination 100 ⁇ g LNg and 20 ⁇ g EE for 21 days.
  • Lachnit-Fixson U.S. Patent 3,969,502 discloses biphasic progestin/estrogen combination regimens in which a combination of 50-125 ⁇ g LNg and 25-35 ⁇ g EE are administered for 10-12 days in the first phase and 100-350 ⁇ g LNg and 30-50 ⁇ g EE are administered for 10-12 days in the second phase. Placebo is administered for 5-7 days following the administration of the contraceptive steroid regimen.
  • Lachnit-Fixson U.S. Patent 3,957,982 discloses triphasic 21-day progestin/estrogen regimens in which a combination of 40-90 ⁇ g LNg and 20-50 ⁇ g EE is administered for 4-6 days in the first phase, 50-125 ⁇ g LNg and 30-50 ⁇ g EE is administered for 4-6 days in the second phase, and 100-250 ⁇ g LNg and 25-50 ⁇ g EE is administered for 9-1 1 days in the third phase. It is preferred that the first, second, and third phases are 6, 5, and 10 days, respectively.
  • Bennick U.S. Patent 5,418,2278 discloses triphasic regimens which consist of the administration of a combination progestin/estrogen in a 6-8 day phase, a second 6-8 day phase, and a third 6-8 day phase, with it being preferred that the three contraceptive steroid phases be 7 days each.
  • the first contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 150 ⁇ g DSG and an estrogen at a daily dosage equivalent to 20 - 25 ⁇ g EE;
  • the second contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 125 ⁇ g DSG and an estrogen at a daily dosage equivalent to 20 ⁇ g EE;
  • the third contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 100 ⁇ g DSG and an estrogen at a daily dosage equivalent to 20 ⁇ g EE.
  • Placebo is administered for 7 days following the 21 -day contraceptive steroid period.
  • the progestin may be 3-KDSG, DSG, LNg, or GTD.
  • Bergink U.S. Patent 5,262,408 discloses a 24 day triphasic combination regimen in which the first 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 100 ⁇ g DSG and an estrogen at a daily dosage equivalent to 25 ⁇ g EE, the second 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 125 ⁇ g DSG and an estrogen at a daily dosage equivalent to 20 ⁇ g EE, and the third 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 50 ⁇ g DSG and an estrogen at a daily dosage equivalent to 20 ⁇ g EE.
  • the three phases be 8 days each.
  • a placebo may be administered for 4 days, the 4 day interval may be pill free, or a progestin at a dosage equivalent to 25-35 ⁇ g DSG may be administered.
  • Boissonneault U.S. Patent 4,962,098 discloses triphasic progestin/estrogen combinations in which the amount of the estrogenic component is increased stepwise over the three phases. Contraceptive steroid combinations are taken for 4-7 days during the first phase (5 days being preferred); for 5-8 days during the second phase (7 days preferred); and for 7-12 days during the third phase (9 days being preferred). Following the administration of 21 -days of the contraceptive steroid combination, placebo is taken for 7 days. For all three phases, 0.5-1.5 mg of norethindrone acetate is used in the progestin, with 1 mg being preferred. 10-30 ⁇ g EE is used in the first phase, 20-40 ⁇ g in the second, and 30-50 ⁇ g in the third phase.
  • Pasquale U.S. Patent 4,921,843 discloses combination progestin/estrogen contraceptive regimens which contain 0.5 to 1 mg of progestin and an estrogen having a dose equivalent to 10-40 ⁇ g of EE.
  • NE, LNg, D-17 ⁇ -acetoxy-13 ⁇ -ethyl-17 ⁇ -ethinyl- gon-4-en-3-one oxime, and 19-nor-17-hydroxy progesterone ester are disclosed as progestins, with NE being preferred.
  • Specifically disclosed regimens include a uniphasic regimen (2 days of placebo, 5 days of 20 ⁇ g EE, and 21 days of a combination of 500 ⁇ g NE and 35 ⁇ g EE); a uniphasic regimen (2 days of placebo, 5 days of 40 ⁇ g EE, and 21 days of a combination of 500 ⁇ g NE and 35 ⁇ g EE); and a triphasic regimen (2 days of placebo; 5 days of 20-40 ⁇ g EE; 7 days of a combination of 500 ⁇ g NE and 35 ⁇ g EE; 7 days of a combination of 750 ⁇ g NE and 35 ⁇ g EE; and 7 days of a combination of 1 mg NE and 35 ⁇ g EE).
  • Pasquale U.S. Patent 4,628,051 discloses triphasic progestin/estrogen combination regimens in which contraceptive steroid is administered for 21 days. Contraceptive steroid combinations are taken for 5-8 days during the first phase (7 days being preferred); for 7-1 1 days during the second phase (7 days preferred); and for 3-7 days during the third phase (7 days being preferred). In all three phases, an estrogen at a daily dosage equivalent to 20-50 ⁇ g EE is administered in combination with a progestin having a daily dosage equivalent to 65-750 ⁇ g NE in the first phase, 0.25- 1.0 mg NE in the second phase, and 0.35-2.0 mg NE in the third phase.
  • a specific triphasic regimen discloses the administration of 35 ⁇ g EE in each of the three 7-day phases in combination with 0.5 mg, 0.75 mg, and 1.0 mg in the first, second, and third phases, respectively.
  • a second specific triphasic regimen discloses the administration of 35 ⁇ g EE in each of the three 7-day phases in combination with 50 ⁇ g, 75 ⁇ g, and 100 ⁇ g in the first, second, and third phases, respectively.
  • a third specific triphasic regimen discloses the administration of 35 ⁇ g EE in each of the three 7-day phases in combination with 25 ⁇ g, 35 ⁇ g, and 50 ⁇ g in the first, second, and third phases, respectively.
  • Lachnit-Fixson U.S. Patent 4,621,079 discloses triphasic 21-day progestin/estrogen combination regimens in which a combination of 40-70 ⁇ g GTD and 20-35 ⁇ g EE is administered for 4-6 days in the first phase; 50-100 ⁇ g GTD and 30-50 ⁇ g EE is administered for 4-6 days in the second phase; and 80-120 ⁇ g GTD and 20-50 ⁇ g EE is administered for 9-11 days in the third phase. Placebo is administered for 7 days following the 21 -day contraceptive steroid regimen. Pasquale (U.S.
  • Patent 4,530,839) discloses triphasic 21-day progestin/estrogen combination regimens in which a dose of 20-50 ⁇ g EE is administered in all three phases in combination with a contraceptively effective daily dose of progestin in the first phase, 1.5-2 times that dose of progestin in the second phase, and 2-2.5 times the first phase dose of progestin in the third phase.
  • Each of the three phases is 7 days long.
  • a specific regimen discloses 20-50 ⁇ g EE in combination with 500 ⁇ g LNg, 750 ⁇ g LNg, and 1 mg LNg during each of the three 7-day phases, respectively.
  • Edgren U.S. Patent 4,390,531 discloses triphasic 21-day progestin/estrogen combination regimens in which a dose of 20-40 ⁇ g EE (or another estrogen in an equivalent dosage) is administered in all three phases in combination with 0.3-0.8 mg NE (or another progestin in an equivalent dosage) for 5-8 days in the first phase, twice the dose of NE for 7-1 1 days in the second phase, and the dose of NE being the same as in the first phase for 3-7 days in the third phase. It is preferred that each of the three phases is 7 days. Placebo is administered for 6-8 days following administration of the contraceptive steroid combination.
  • a specific regimen discloses a first phase of 7 days of 0.5 mg NE in combination with 35 ⁇ g EE, a second 7 day phase of 1.0 mg NE in combination with 35 ⁇ g EE, and a third 7 day phase of 0.5 mg NE in combination with 35 ⁇ g EE.
  • Oettel (EP 628,312 Al) discloses combination contraceptive combinations containing the combination of three components: a biogenic estrogen (estradiol, estrone, or estriol), a synthetic estrogen (EE or mestranol), and a progestin (LNg, desogestrel, progesterone, norethisterone acetate, DSGT, chlormadinone acetate, gestodene, or cyproterone acetate).
  • the combination is administered for 21 days followed by the administration of placebo (or pill free) or an estrogen on days 22-28 of the cycle.
  • Oettel (EP 696,454 A2) discloses a three phase contraceptive regimen in which the first phase consists of the administration for 3-4 days of a composition containing at least one biogenic estrogen; the second phase consists of the administration for 20-22 days of at least one biogenic estrogen and at least one progestin (progesterone, DGST, desogestrel, 3-KDSG, GTD, LNg, norgestimate, notethisterone, norethisterone acetate, dehydrogestrone, chloromadinone acetate, cyproterone acetate, medroxyprogesterone acetate, or megestrol acetate); and the third phase consists of the administration for 3-4 days of a composition containing at least biogenic one estrogen.
  • progestin progesterone, DGST, desogestrel, 3-KDSG, GTD, LNg, norgestimate, notethisterone, norethisterone acetate, dehydroges
  • This invention provides a bridged monophasic combination progestin/estrogen oral contraceptive regimen for females of child-bearing age that provides effective contraception, good cycle control, and minimal side effects while greatly reducing the total contraceptive steroid administered (particularly the estrogenic component) per 28- day cycle.
  • the low dose progestin/estrogen combination is administered for 23-25-days per cycle followed by the administration of an estrogen for the remaining 3-5 days of the cycle.
  • Administration of the contraceptive progestin/estrogen combination is begun on the first day of menses (day 1), and continued for 23-25 consecutive days. Following the 23- 25-day administration period, an estrogen is administered for 3-5 days to assist in maintaining good cycle control. The total administration during each cycle is 28 days.
  • this invention provides a method of contraception which comprises administering to a female of child bearing age a combination of a progestin at a daily dosage equivalent in progestational activity to 40-125 ⁇ g levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 ⁇ g ethinyl estradiol for 23-25 days beginning on day 1 of the menstrual cycle. Following the 23- 25-day period, an estrogen at a daily dosage equivalent to 5-15 ⁇ g ethinyl estradiol is administered for 3-5 days. The total administration during each cycle is 28 days.
  • progestins include, but are not limited to levonorgestrel, norgestrel, desogestrel, 3-ketodesogestrel, norethindrone, gestodene, norethisterone acetate, and norgestimate. It is more preferred that the progestin is levonorgestrel. When levonorgestrel is used as the progestin, it is preferred that the daily dosage of levonorgestrel is 40-100 ⁇ g.
  • Preferred estrogens include, but are not limited to ethinyl estradiol; 17 ⁇ - estradiol; conjugated estrogens, USP; estrone or a salt thereof; and mestranol; with ethinyl estradiol being more preferred.
  • ethinyl estradiol is used as the estrogen during the first 23-25 days of the cycle, it is preferred that the daily dosage of ethinyl estradiol is 10-15 ⁇ g, with 15 ⁇ g being more preferred.
  • the daily dosage of ethinyl estradiol is 5-15 ⁇ g, with 15 ⁇ g being more preferred.
  • the daily dosage of 17 ⁇ -estradiol is 1-3 ⁇ g.
  • Preferred salts of estrone include, but are not limited to the sodium and piperate salt.
  • conjugated estrogens USP are used as the estrogen, it is preferred that the daily dosage is 0.3-5 mg, with a daily dose of 1.25 mg conjugated estrogens, USP being equivalent to a daily dose of 15 ⁇ g ethinyl estradiol.
  • the progestin/estrogen combination be administered for 24 days beginning on day 1 of the menstrual cycle, and following this 24-day period, it is preferred that the estrogen be administered for 4 days.
  • the following daily dosages of a combination of levonorgestrel and ethinyl estradiol are preferred for contraception when administered for 23-25 consecutive days beginning on the first day of menses, followed by the administration of ethinyl estradiol for 3-5 days.
  • the total administration during each cycle is 28 days. It is preferred that the dose of ethinyl estradiol during the 3-5 day period be the same as the dose of ethinyl estradiol that was administered during the 24 day period, or lower.
  • the combination progestin/estrogen contraceptive be administered in unit dosage form i.e., tablet or pill, with each unit providing the entire daily dosage. It is preferred that the progestin and estrogen are admixed together in the same dosage unit. Such dosage units can be prepared by conventional methodology that is well known to one skilled in the art. In each dosage unit, the contraceptively active progestin and estrogen are combined with excipients, vehicles, pharmaceutically acceptable carriers, and colorants. For example, the following illustrates an acceptable composition of a contraceptive progestin/estrogen combination of this invention.
  • the estrogen be administered in unit dosage form i.e., tablet or pill, with each unit providing the entire daily dosage.
  • unit dosage form i.e., tablet or pill
  • each unit providing the entire daily dosage.
  • dosage units can be prepared by conventional methodology that is well known to one skilled in the art.
  • the estrogen is combined with excipients, vehicles, pharmaceutically acceptable carriers, and colorants.
  • excipients, vehicles, pharmaceutically acceptable carriers, and colorants for example, the following illustrates an acceptable estrogen composition of this invention.
  • Ethinyl estradiol 15 ⁇ g Microcrystaline Cellulose Lactose, NF, Spray Dried Polacrillin Potassium, NF Magnesium Stearate
  • This invention also provides a contraceptive kit adapted for daily oral administration which comprises a total of 28 separate dosage units.
  • a contraceptive kit adapted for daily oral administration which comprises a total of 28 separate dosage units.
  • 23-25 dosage units each consisting of a combination of progestin at a daily dosage equivalent in progestational activity to 40-125 ⁇ g levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 ⁇ g ethinyl estradiol.
  • the remaining 3-5 dosage units contain an estrogen at a daily dosage equivalent in estrogenic activity to
  • the daily dosage arrangements are preferably arranged in a blister pack or in a dial pack type tablet dispenser. Specific referred progestins and estrogens and the specifically preferred dosages of each combination dosage unit are described above.

Abstract

This invention provides a method of contraception which comprises administering to a female of childbearing age for 28 days per menstrual cycle a combination of a progestin at a daily dosage equivalent to 40-125 νg levonorgestrel and an estrogen at a daily dosage equivalent to 10-15 νg ethinyl estradiol for 23-25 days beginning on day 1 of the menstrual cycle, followed by administering an estrogen at a daily dosage equivalent to 5-15 νg ethinyl estradiol for 3-5 days.

Description

ORAL CONTRACEPTIVE
BACKGROUNDOFTHEINVENTION
The vast majority of oral contraceptives consist of a combination of a progestin and estrogen that are administered concurrently for 21 days followed either by a 7 day pill free interval or by the administration of a placebo for 7 days in each 28 day cycle. The most important aspects of a successful oral contraceptive product are effective contraception, good cycle control (absence of spotting and breakthrough bleeding and occurrence of withdrawal bleeding), and minimal side effects. Combination oral contraceptives have traditionally acted by suppression of gonadotropins. In addition, it appears that the progestin component is primarily responsible for contraceptive efficacy through inhibition of ovulation, and other peripheral effects which include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation). The estrogenic component intensifies the anovulatory effect of the progestin, and is also important for maintaining cycle control.
Since the introduction of oral contraceptives (OCs) over a quarter-century ago, research has been directed toward developing preparations that minimize the potential for side effects while maintaining efficacy and normal menstrual patterns. The first- generation OCs contained more progestin and estrogen than was necessary to prevent conception. Adverse hemostatic and metabolic changes, clinical problems, and side effects were associated with these high-dose preparations. In 1978, the World Health Organization (WHO) recommended that the focus of OC research should be the development of products containing the lowest possible dose levels of estrogen and progestin.
The first reductions in steroid content in a combination pill were focused on estrogen because it, rather than progestin, was thought to be related to the most serious side effects. Reduction in progestin content followed, as evidence mounted that lowering progestin intake might lower the risk of cardiovascular complications such as stroke and ischemic heart disease. [Kay CR, Am J Obstet Gynecol 142:762 (1982)]. However, this evidence was not as clear as that implicating estrogen in thromboembolic disorders. [Inman WHW, Br Med J 2:203 (1970); Stolley PD, Am J Epidemiol 102:197 (1975)]. The need for a balance between estrogens and progestins to rninirnize adverse effects on carbohydrate metabolism and on lipid and lipoprotein levels was also recognized. [Bradley DD, N Engl J Med 299:17 (1978); Wynn V, Lancet 1: 1045 (1979)]. Researchers then found that the synergistic action between progestin and estrogen in a balanced ratio successfully inhibited ovulation at low levels of both components.
Research into low-dose progestins was advanced significantly by the development of norgestrel (Ng) and levonorgestrel (LNg). Levonorgestrel is the biologically active moiety of racemic norgestrel. It is strongly progestational, has no inherent estrogenic activity, is antiestrogenic, and possesses good biologic activity. The contraceptive effects of levonorgestrel are manifested throughout the hypothalamic- pituitary-gonadal-target organ axis.
Ethinyl estradiol (EE) is the estrogen most frequently used in combination OCs. In attempts to fulfill the WHO objective, the dosage of EE in marketed OC formulations has been steadily reduced from that found in earlier OCs. Thromboembolic mortality decreased when the amount of synthetic estrogen in OC formulations was reduced from 100 μg to 50 μg. Subsequently, a significant reduction in fatal myocardial infarctions was reported for women using OCs with 30 μg of EE rather than 50 μg of EE. [Meade TW. Br Med J 280:1157 (1980)].
In keeping with the goal of reducing the total steroidal dosage, while maintaining contraceptive efficacy, good cycle control, and minimizing side effects, numerous regimens have been developed in which the progestin/estrogen combination is administered either as a fixed dosage combination (monophasic) or as biphasic or triphasic regimens in which the dosage of the combination is varied either once or twice throughout the menstrual cycle. In these regimens, the progestin/estrogen combination is typically administered for 21 days followed by either a 7-day pill free period or the administration of a non-contraceptive placebo (or iron supplement) for 7 days. In these regimens, 3-ketodesogestrel (3-KDSG), desogestrel (DSG), levonorgestrel (LNg), gestodene (GTD), norgestrel (NG), and norethindrone (NE) are typically used as the progestin while ethinyl estradiol (EE); 17β-estradiol, and mestranol are typically the estrogenic components.
Several examples of attempts at reducing the total steroidal dosage are provided below. Erlich (German Patent DE 4,104,385 CI and U.S. Patent 5,280,023) discloses sequential contraceptive regimens consisting of the administration of an estrogen which effects a disturbance of follicle stimulation, followed by the administration of a combination of a progestin/estrogen in a dose at least adequate to inhibit ovulation. The regimen is administered for a total of 28 days per cycle. It is preferred that the estrogen is administered for 5-14 days per cycle and the progestin/estrogen combination is administered for 23-14 days per cycle, so that the total administration is for 28 days per cycle. Specific regimens include (a) 4 mg estradiol for 7 days followed by 21 days of the combination of 1 mg norethisterone acetate and 4 mg estradiol; (b) 2 mg estradiol valerate for 7 days followed by 21 days of the combination of 2 mg chlormadinone acetate and 4 mg estradiol valerate; and (c) 20 μg EE followed by 18 days of the combination of 150 μg LNg and 20 μg EE. Regimen (c) in Erlich provides a total steroidal load of 2.7 mg of LNg and 560 μg EE per 28 day cycle.
Lachnit (PCT Publication WO 95/26730) discloses bridged regimens consisting of the administration of a combination of a progestin/estrogen combination (50 - 125 μg LNg and 10 - 40 μg EE) for the first 23-24 days of the menstrual cycle followed by the administration of an estrogen (2 - 40 μg EE) for 4-10 days for a total administration of at least 28 days per cycle. The use of 100 - 300 μg drospirenone and 10 - 40 μg EE as the 23-24 day progestin/estrogen combination is disclosed. Lachnit also discloses a triphasic plus bridging regimen (4-9 days, 4-9 days, 9-13 days, and 28 days for the three phases and estrogen phase, respectively) in which a combination of 50 μg LNg and 20 μg EE are administered in the first phase, a combination of 75 μg LNg and 25 μg EE are administered in the second phase, a combination of 100 μg LNg and 20 μg EE are administered in the third phase, and 10 μg EE is administered in the estrogen phase. Other progestins disclosed include GTD, DSG, 3-KDSG, DRSP, cyproterone acetate, norgestimate, and norethisterone.
Moore (DE 4313926 Al) discloses bridged triphasic regimens consisting of the administration of a combination of 10 - 50 μg LNg and 5 - 20 μg EE from days 1-7 of the menstrual cycle; of 50 - 75 μg LNg and 5 - 20 μg EE from days 8-14 of the menstrual cycle; of 75 - 125 μg LNg and 5 - 20 μg EE from days 15-21 of the menstrual cycle; and 5 - 20 μg EE from days 22-28 of the menstrual cycle.
Spona (PCT Publication WO 95/17194) discloses contraceptive regimens which consist of the administration of a combinaton of a progestin (50 - 75 μg GTD, 75 - 125 μg LNg, 60 - 150 μg DSG, 60 - 150 μg 3-KDSG, 100 - 300 μg DRSP, 100 - 200 μg cyproterone acetate, 200 - 300 μg norgestimate, or >350 - 750 μg norethisterone) and an estrogen (15 - 20 μg EE or 2 - 6 mg 17β-estradiol) for 23-24 days per cycle.
Upton (EP Patent Specification 253,607 Bl) teaches the use of low dose progestin/estrogen combinations for combined hormone replacement therapy and contraception in climacteric women. Climacteric women are defined in Upton as pre- menopausal women around 40 years of age whose hormone levels are waning. The climacteric woman still ovulates (albeit may have irregular ovulation), but she still experiences many of the symptoms of the hypoestrogenic menopausal woman, such as insomnia, hot flushes, and irritability. Upton teaches the administration of a 23-26 day monophasic regimen of progestin/estrogen followed by a pill free or placebo interval of 2-5 days; with 24 days of progestin/estrogen administration followed by a 4-day pill free or placebo administration being preferred. Upton teaches the use of a progestin selected from 25 - 100 μg LNg, 10 - 70 μg GTD, 25 - 100 μg DSG, 25 - 100 μg 3- KDSG, and 85 - 350 μg NE used in combination with an estrogen selected from 500 - 2000 μg 17β-estradiol, 8 - 30 μg EE, and 15 - 60 μg mestranol. Based on relative potencies, Upton teaches that a dose of 75 μg LNg is equivalent to 35 μg of GTD, 75 μg of 3-KDSG or DSG, and 250 μg NE and that a dose of 1000 μg of 17β-estradiol is equivalent to a dose of 15 μg EE and 30 μg mestranol. Upton also teaches that NG may be substituted for LNg, but at twice the dose.
Sartoretto (Clinica e Terapeutica 3: 399 (1974)) discloses a monophasic contraceptive regimen consisting of the administration of a combination 100 μg LNg and 20 μg EE for 21 days.
Lachnit-Fixson (U.S. Patent 3,969,502) discloses biphasic progestin/estrogen combination regimens in which a combination of 50-125 μg LNg and 25-35 μg EE are administered for 10-12 days in the first phase and 100-350 μg LNg and 30-50 μg EE are administered for 10-12 days in the second phase. Placebo is administered for 5-7 days following the administration of the contraceptive steroid regimen.
Lachnit-Fixson (U.S. Patent 3,957,982) discloses triphasic 21-day progestin/estrogen regimens in which a combination of 40-90 μg LNg and 20-50 μg EE is administered for 4-6 days in the first phase, 50-125 μg LNg and 30-50 μg EE is administered for 4-6 days in the second phase, and 100-250 μg LNg and 25-50 μg EE is administered for 9-1 1 days in the third phase. It is preferred that the first, second, and third phases are 6, 5, and 10 days, respectively.
Bennick (U.S. Patent 5,418,228) discloses triphasic regimens which consist of the administration of a combination progestin/estrogen in a 6-8 day phase, a second 6-8 day phase, and a third 6-8 day phase, with it being preferred that the three contraceptive steroid phases be 7 days each. Bennick discloses that the first contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 150 μg DSG and an estrogen at a daily dosage equivalent to 20 - 25 μg EE; the second contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 125 μg DSG and an estrogen at a daily dosage equivalent to 20 μg EE; and the third contraceptive steroid phase consists of a progestin at a daily dosage equivalent to 75 - 100 μg DSG and an estrogen at a daily dosage equivalent to 20 μg EE. Placebo is administered for 7 days following the 21 -day contraceptive steroid period. Bennick discloses that the progestin may be 3-KDSG, DSG, LNg, or GTD. Bergink (U.S. Patent 5,262,408) discloses a 24 day triphasic combination regimen in which the first 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 100 μg DSG and an estrogen at a daily dosage equivalent to 25 μg EE, the second 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 125 μg DSG and an estrogen at a daily dosage equivalent to 20 μg EE, and the third 7-9 day phase consists of the administration of a progestin at a daily dosage equivalent to 50 μg DSG and an estrogen at a daily dosage equivalent to 20 μg EE. It is preferred that the three phases be 8 days each. Following the 24 day contraceptive steroid administration, a placebo may be administered for 4 days, the 4 day interval may be pill free, or a progestin at a dosage equivalent to 25-35 μg DSG may be administered.
Boissonneault (U.S. Patent 4,962,098) discloses triphasic progestin/estrogen combinations in which the amount of the estrogenic component is increased stepwise over the three phases. Contraceptive steroid combinations are taken for 4-7 days during the first phase (5 days being preferred); for 5-8 days during the second phase (7 days preferred); and for 7-12 days during the third phase (9 days being preferred). Following the administration of 21 -days of the contraceptive steroid combination, placebo is taken for 7 days. For all three phases, 0.5-1.5 mg of norethindrone acetate is used in the progestin, with 1 mg being preferred. 10-30 μg EE is used in the first phase, 20-40 μg in the second, and 30-50 μg in the third phase.
Pasquale (U.S. Patent 4,921,843) discloses combination progestin/estrogen contraceptive regimens which contain 0.5 to 1 mg of progestin and an estrogen having a dose equivalent to 10-40 μg of EE. NE, LNg, D-17β-acetoxy-13β-ethyl-17α-ethinyl- gon-4-en-3-one oxime, and 19-nor-17-hydroxy progesterone ester are disclosed as progestins, with NE being preferred. Specifically disclosed regimens include a uniphasic regimen (2 days of placebo, 5 days of 20 μg EE, and 21 days of a combination of 500 μg NE and 35 μg EE); a uniphasic regimen (2 days of placebo, 5 days of 40 μg EE, and 21 days of a combination of 500 μg NE and 35 μg EE); and a triphasic regimen (2 days of placebo; 5 days of 20-40 μg EE; 7 days of a combination of 500 μg NE and 35 μg EE; 7 days of a combination of 750 μg NE and 35 μg EE; and 7 days of a combination of 1 mg NE and 35 μg EE).
Pasquale (U.S. Patent 4,628,051) discloses triphasic progestin/estrogen combination regimens in which contraceptive steroid is administered for 21 days. Contraceptive steroid combinations are taken for 5-8 days during the first phase (7 days being preferred); for 7-1 1 days during the second phase (7 days preferred); and for 3-7 days during the third phase (7 days being preferred). In all three phases, an estrogen at a daily dosage equivalent to 20-50 μg EE is administered in combination with a progestin having a daily dosage equivalent to 65-750 μg NE in the first phase, 0.25- 1.0 mg NE in the second phase, and 0.35-2.0 mg NE in the third phase. A specific triphasic regimen discloses the administration of 35 μg EE in each of the three 7-day phases in combination with 0.5 mg, 0.75 mg, and 1.0 mg in the first, second, and third phases, respectively. A second specific triphasic regimen discloses the administration of 35 μg EE in each of the three 7-day phases in combination with 50 μg, 75 μg, and 100 μg in the first, second, and third phases, respectively. A third specific triphasic regimen discloses the administration of 35 μg EE in each of the three 7-day phases in combination with 25 μg, 35 μg, and 50 μg in the first, second, and third phases, respectively.
Lachnit-Fixson (U.S. Patent 4,621,079) discloses triphasic 21-day progestin/estrogen combination regimens in which a combination of 40-70 μg GTD and 20-35 μg EE is administered for 4-6 days in the first phase; 50-100 μg GTD and 30-50 μg EE is administered for 4-6 days in the second phase; and 80-120 μg GTD and 20-50 μg EE is administered for 9-11 days in the third phase. Placebo is administered for 7 days following the 21 -day contraceptive steroid regimen. Pasquale (U.S. Patent 4,530,839) discloses triphasic 21-day progestin/estrogen combination regimens in which a dose of 20-50 μg EE is administered in all three phases in combination with a contraceptively effective daily dose of progestin in the first phase, 1.5-2 times that dose of progestin in the second phase, and 2-2.5 times the first phase dose of progestin in the third phase. Each of the three phases is 7 days long. A specific regimen discloses 20-50 μg EE in combination with 500 μg LNg, 750 μg LNg, and 1 mg LNg during each of the three 7-day phases, respectively.
Edgren (U.S. Patent 4,390,531) discloses triphasic 21-day progestin/estrogen combination regimens in which a dose of 20-40 μg EE (or another estrogen in an equivalent dosage) is administered in all three phases in combination with 0.3-0.8 mg NE (or another progestin in an equivalent dosage) for 5-8 days in the first phase, twice the dose of NE for 7-1 1 days in the second phase, and the dose of NE being the same as in the first phase for 3-7 days in the third phase. It is preferred that each of the three phases is 7 days. Placebo is administered for 6-8 days following administration of the contraceptive steroid combination. A specific regimen discloses a first phase of 7 days of 0.5 mg NE in combination with 35 μg EE, a second 7 day phase of 1.0 mg NE in combination with 35 μg EE, and a third 7 day phase of 0.5 mg NE in combination with 35 μg EE.
Oettel (EP 628,312 Al) discloses combination contraceptive combinations containing the combination of three components: a biogenic estrogen (estradiol, estrone, or estriol), a synthetic estrogen (EE or mestranol), and a progestin (LNg, desogestrel, progesterone, norethisterone acetate, DSGT, chlormadinone acetate, gestodene, or cyproterone acetate). In one embodiment, the combination is administered for 21 days followed by the administration of placebo (or pill free) or an estrogen on days 22-28 of the cycle.
Oettel (EP 696,454 A2) discloses a three phase contraceptive regimen in which the first phase consists of the administration for 3-4 days of a composition containing at least one biogenic estrogen; the second phase consists of the administration for 20-22 days of at least one biogenic estrogen and at least one progestin (progesterone, DGST, desogestrel, 3-KDSG, GTD, LNg, norgestimate, notethisterone, norethisterone acetate, dehydrogestrone, chloromadinone acetate, cyproterone acetate, medroxyprogesterone acetate, or megestrol acetate); and the third phase consists of the administration for 3-4 days of a composition containing at least biogenic one estrogen.
DESCRIPTION OF THE INVENTION
This invention provides a bridged monophasic combination progestin/estrogen oral contraceptive regimen for females of child-bearing age that provides effective contraception, good cycle control, and minimal side effects while greatly reducing the total contraceptive steroid administered (particularly the estrogenic component) per 28- day cycle. To achieve the substantial reduction in the total contraceptive steroid administered per cycle while maintaining good cycle control, the low dose progestin/estrogen combination is administered for 23-25-days per cycle followed by the administration of an estrogen for the remaining 3-5 days of the cycle. Administration of the contraceptive progestin/estrogen combination is begun on the first day of menses (day 1), and continued for 23-25 consecutive days. Following the 23- 25-day administration period, an estrogen is administered for 3-5 days to assist in maintaining good cycle control. The total administration during each cycle is 28 days.
More particularly, this invention provides a method of contraception which comprises administering to a female of child bearing age a combination of a progestin at a daily dosage equivalent in progestational activity to 40-125 μg levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 μg ethinyl estradiol for 23-25 days beginning on day 1 of the menstrual cycle. Following the 23- 25-day period, an estrogen at a daily dosage equivalent to 5-15 μg ethinyl estradiol is administered for 3-5 days. The total administration during each cycle is 28 days.
Preferred progestins include, but are not limited to levonorgestrel, norgestrel, desogestrel, 3-ketodesogestrel, norethindrone, gestodene, norethisterone acetate, and norgestimate. It is more preferred that the progestin is levonorgestrel. When levonorgestrel is used as the progestin, it is preferred that the daily dosage of levonorgestrel is 40-100 μg. Preferred estrogens include, but are not limited to ethinyl estradiol; 17β- estradiol; conjugated estrogens, USP; estrone or a salt thereof; and mestranol; with ethinyl estradiol being more preferred. When ethinyl estradiol is used as the estrogen during the first 23-25 days of the cycle, it is preferred that the daily dosage of ethinyl estradiol is 10-15 μg, with 15 μg being more preferred. When ethinyl estradiol is used as the estrogen during the last 3-5 days of the cycle, it is preferred that the daily dosage of ethinyl estradiol is 5-15 μg, with 15 μg being more preferred. When 17β-estradiol is used as the estrogen during the last 3-5 days of the cycle, it is preferred that the daily dosage of 17β-estradiol is 1-3 μg. Preferred salts of estrone include, but are not limited to the sodium and piperate salt. When conjugated estrogens, USP are used as the estrogen, it is preferred that the daily dosage is 0.3-5 mg, with a daily dose of 1.25 mg conjugated estrogens, USP being equivalent to a daily dose of 15 μg ethinyl estradiol.
It is preferred that the progestin/estrogen combination be administered for 24 days beginning on day 1 of the menstrual cycle, and following this 24-day period, it is preferred that the estrogen be administered for 4 days.
The following daily dosages of a combination of levonorgestrel and ethinyl estradiol are preferred for contraception when administered for 23-25 consecutive days beginning on the first day of menses, followed by the administration of ethinyl estradiol for 3-5 days. The total administration during each cycle is 28 days. It is preferred that the dose of ethinyl estradiol during the 3-5 day period be the same as the dose of ethinyl estradiol that was administered during the 24 day period, or lower.
PREFERRED DAILY DOSAGES
First 23-25 Cvcle Davs Last 3-5 Cvcle Davs
Regimen Levonorεestrel Ethinvl Estradiol Ethinvl Estradiol
A 100 μg 15 μg 5-15 μg
B 90 μg 15 μg 5-15 μg
C 75 μg 15 μg 5-15 μg
D 60 μg 15 μg 5-15 μg
E 50 μg 15 μg 5-15 μg
F 40 μg 15 μg 5-15 μg
G 100 μg 10 μg 5-10 μg
H 90 μg 10 μg 5-10 μg
I 75 μg 10 μg 5-10 μg
J 60 μg 10 μg 5-10 μg
K 50 μg 10 μg 5-10 μg
L 40 μg 10 μg 5-10 μg The following daily dosages of a combination of levonorgestrel and ethinyl estradiol are more preferred for contraception when administered for 24 consecutive days beginning on the first day of menses, followed by the administration of ethinyl estradiol for 4 days. The total administration during each cycle is 28 days. Of the regimens listed below, Regimens M-O are more preferred, with Regimen M being most preferred.
MORE PREFERRED DAILY DOSAGES
First 24 Cvcle Davs Last 4 Cycle Davs
Regimen Levonorgestrel Ethinvl Estradiol Ethinyl Estradiol
M 75 μg 15 μg 15 μg
N 90 μg 15 μg 15 μg
O 100 μg 15 μg 15 μg
P 50 μg 10 μg 10 μg
Q 60 μg 15 μg 15 μg
R 75 μg 10 μg 10 μg
S 40 μg 15 μg 15 μg
For administration during the first 23-25 days of the menstrual cycle, it is preferred that the combination progestin/estrogen contraceptive be administered in unit dosage form i.e., tablet or pill, with each unit providing the entire daily dosage. It is preferred that the progestin and estrogen are admixed together in the same dosage unit. Such dosage units can be prepared by conventional methodology that is well known to one skilled in the art. In each dosage unit, the contraceptively active progestin and estrogen are combined with excipients, vehicles, pharmaceutically acceptable carriers, and colorants. For example, the following illustrates an acceptable composition of a contraceptive progestin/estrogen combination of this invention.
EXAMPLE 1
Levonorgestrel, 75 μg Ethinyl estradiol, 15 μg
Microcrystaline Cellulose Lactose, NF, Spray Dried Polacrillin Potassium, NF Magnesium Stearate Opadry Pink
Polyethylene Glycol, 1500, Flakes Water, Purified, USP Wax E (Pharma)
For administration during the last 3-5 days of the menstrual cycle, it is preferred that the estrogen be administered in unit dosage form i.e., tablet or pill, with each unit providing the entire daily dosage. Such dosage units can be prepared by conventional methodology that is well known to one skilled in the art. In each dosage unit, the estrogen is combined with excipients, vehicles, pharmaceutically acceptable carriers, and colorants. For example, the following illustrates an acceptable estrogen composition of this invention.
EXAMPLE 2
Ethinyl estradiol, 15 μg Microcrystaline Cellulose Lactose, NF, Spray Dried Polacrillin Potassium, NF Magnesium Stearate
Opadry Pink
Polyethylene Glycol, 1500, Flakes Water, Purified, USP Wax E (Pharma) This invention also provides a contraceptive kit adapted for daily oral administration which comprises a total of 28 separate dosage units. In this kit, 23-25 dosage units each consisting of a combination of progestin at a daily dosage equivalent in progestational activity to 40-125 μg levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 μg ethinyl estradiol. The remaining 3-5 dosage units contain an estrogen at a daily dosage equivalent in estrogenic activity to
5-15 μg ethinyl estradiol. The daily dosage arrangements are preferably arranged in a blister pack or in a dial pack type tablet dispenser. Specific referred progestins and estrogens and the specifically preferred dosages of each combination dosage unit are described above.

Claims

WHAT IS CLAIMED IS:
1 . A method of contraception which comprises administering to a female of child bearing age a combination of a progestin at a daily dosage equivalent in progestational activity to 40-125 μg levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 μg ethinyl estradiol for 23-25 days per menstrual cycle beginning on day 1 of the menstrual cycle; wherein the same dosage of the progestin and estrogen combination is administered in each of the 23-25 days, followed by the administration of an estrogen at a daily dosage equivalent in estrogenic activity to 5-15 μg ethinyl estradiol for 3-5 days; wherein the same dosage of the estrogen is administered in each of the 3-5 days; such that the number of days of administration of the progestin and estrogen combination plus the number of days of administration of estrogen is equal to 28 per menstrual cycle.
2. The method according to claim 1, wherein the progestin is selected from the group consisting of levonorgestrel, norgestrel, desogestrel, 3-ketodesogestrel, norethindrone, gestodene, norethisterone acetate, and norgestimate.
3. The method according to claim 2, wherein the estrogen is selected from the group consisting of ethinyl estradiol; 17β-estradiol; conjugated estrogens, USP; estrone or a salt thereof; and mestranol.
4. The method according to claim 3, wherein the progestin is levonorgestrel.
5. The method according to claim 4, wherein the estrogen is ethinyl estradiol.
6. The method according to claim 5, wherein the levonorgestrel and ethinyl estradiol combination is administered for 24 days per menstrual cycle beginning on day 1 of the menstrual cycle, followed by the administration of ethinyl estradiol for 4 days per menstrual cycle.
7. The method according to claim 6, wherein the daily dosage of levonorgestrel is 40-100 μg.
8. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 75 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 15 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 15 μg.
9. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 90 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 15 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 15 μg.
10. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 100 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 15 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 15 μg.
1 1. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 50 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 10 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 10 μg.
12. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 60 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 15 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 15 μg.
13. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 75 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 10 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 10 μg.
14. The method according to claim 7, wherein the daily dosage of levonorgestrel in the combination that is administered for 24 days is 40 μg; the daily dosage of ethinyl estradiol in the combination that is administered for 24 days is 15 μg; and the daily dosage of ethinyl estradiol that is administered for 4 days following the 24-day combination is 15 μg.
15. A contraceptive kit adapted for daily oral administration which comprises 28 separate dosage units, 23-25 of said dosage units each containing a combination of progestin at a daily dosage equivalent in progestational activity to 40-125 μg levonorgestrel and an estrogen at a daily dosage equivalent in estrogenic activity to 10-15 μg ethinyl estradiol, wherein each of the 23-25 dosage units contains the same dosage of progestin and estrogen; and 3-5 of said dosage units containing an estrogen at a daily dosage equivalent in estrogenic activity to 5-15 μg ethinyl estradiol, wherein each of the 3-5 dosage units contains the same dosage of estrogen.
16. The contraceptive kit according to claim 15 wherein the progestin is selected from the group consisting of selected from the group consisting of levonorgestrel, norgestrel, desogestrel, 3-ketodesogestrel, norethindrone, gestodene, norethisterone acetate, and norgestimate, and the estrogen is selected from the group consisting of ethinyl estradiol; 17β-estradiol; conjugated estrogens, USP; estrone or a salt thereof; and mestranol.
17. The contraceptive kit according to claim 16, wherein 24 of the 28 dosage units contain the progestin and estrogen combination, and 4 of the dosage units are progestin free.
18. The contraceptive kit according to claim 17 wherein the progestin is levonorgestrel and the estrogen in the progestin containing and progestin free dosage units is ethinyl estradiol.
19. The contraceptive kit according to claim 18 wherein the dosage of levonorgestrel in each of the progestin containing dosage units is 40-100 μg.
20. The contraceptive kit according to claim 19 wherein the dosage of levonorgestrel in each progestin containing dosage unit is 75 μg and the dosage of ethinyl estradiol in each progestin containing and progestin free dosage unit is 15 μg.
PCT/US1997/007074 1996-05-08 1997-04-28 Oral contraceptive WO1997041868A1 (en)

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EP2020236A1 (en) 1999-10-25 2009-02-04 Laboratoire Theramex Contraceptive medicament based on a progestative and oestrogen, method for producing the same, and use
US7749987B2 (en) 1996-10-08 2010-07-06 Laboratorie Theramek Contraception method
US8617597B2 (en) 2006-07-06 2013-12-31 Bayer Intellectual Property Gmbh Pharmaceutical composition containing a tetrahydrofolic acid

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EP0628312A1 (en) * 1993-03-12 1994-12-14 JENAPHARM GmbH Anti-contraceptive composition
WO1995026730A1 (en) * 1994-03-30 1995-10-12 Schering Aktiengesellschaft Combined hormonal contraception pharmaceutical preparation

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EP0628312A1 (en) * 1993-03-12 1994-12-14 JENAPHARM GmbH Anti-contraceptive composition
WO1995026730A1 (en) * 1994-03-30 1995-10-12 Schering Aktiengesellschaft Combined hormonal contraception pharmaceutical preparation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7749987B2 (en) 1996-10-08 2010-07-06 Laboratorie Theramek Contraception method
EP2020236A1 (en) 1999-10-25 2009-02-04 Laboratoire Theramex Contraceptive medicament based on a progestative and oestrogen, method for producing the same, and use
US8617597B2 (en) 2006-07-06 2013-12-31 Bayer Intellectual Property Gmbh Pharmaceutical composition containing a tetrahydrofolic acid
US11617751B2 (en) 2006-07-06 2023-04-04 Bayer Pharma AG Pharmaceutical composition containing a tetrahydrofolic acid

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