WO1995016447A1 - Anthelmintic composition containing rafoxanide and fenbendazole - Google Patents
Anthelmintic composition containing rafoxanide and fenbendazole Download PDFInfo
- Publication number
- WO1995016447A1 WO1995016447A1 PCT/IE1993/000059 IE9300059W WO9516447A1 WO 1995016447 A1 WO1995016447 A1 WO 1995016447A1 IE 9300059 W IE9300059 W IE 9300059W WO 9516447 A1 WO9516447 A1 WO 9516447A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fenbendazole
- composition according
- rafoxanide
- particle size
- weight
- Prior art date
Links
Classifications
-
- 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
- A61K31/60—Salicylic acid; Derivatives thereof
- A61K31/609—Amides, e.g. salicylamide
-
- 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
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
- A61K31/4164—1,3-Diazoles
- A61K31/4184—1,3-Diazoles condensed with carbocyclic rings, e.g. benzimidazoles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/32—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. carbomers, poly(meth)acrylates, or polyvinyl pyrrolidone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/36—Polysaccharides; Derivatives thereof, e.g. gums, starch, alginate, dextrin, hyaluronic acid, chitosan, inulin, agar or pectin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0087—Galenical forms not covered by A61K9/02 - A61K9/7023
- A61K9/0095—Drinks; Beverages; Syrups; Compositions for reconstitution thereof, e.g. powders or tablets to be dispersed in a glass of water; Veterinary drenches
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/10—Dispersions; Emulsions
Definitions
- This invention relates to compositions useful in the treatment and prevention of helminth infestation in non-human animals, more especially in animals of the bovine, caprine and ovine species. More particularly, the invention relates to compositions useful in the treatment of helminth infestations including fasciolides, flukes, in particular liver flukes and nematodes in bovines and ovines.
- Rafoxanide N-[3-chloro-4-(4-chlorophenoxy)-phenyl]-2- hydroxy-3,5-diiodo benzamide
- Fenbendazole [5(phenylthio)- l H-benzimidazol-2-yl]carbamic acid methyl ester
- rafoxanide and fenbendazole is poorly soluble in many pharmaceutically acceptable solvents.
- EP-A 0 202 568 describes and claims compositions containing rafoxanide and optionally various anthelmintic benzimidazoles, including fenbendazole, in association with a solvent selected from dimethyl isosorbide and glycofurol.
- a solvent selected from dimethyl isosorbide and glycofurol.
- Such compositions are indicated to overcome the problems of the art. It is stated that administration of rafoxanide with or without an anthelmintic benzimidazole derivative in a convenient dosage form, e.g., by rumen injector or oral applicator, is hindered by the extremely low solubility of each component in nearly all pharmaceutically acceptable solvents or the high viscosity of any resulting solution or suspension.
- Helminth infestation is a major problem in ruminant animals, especially those on pasture.
- the animals must be rounded up for dosing. In the case of sheep, the animals may have to be rounded up over a wide area.
- Rafoxanide and fenbendazole are both known to be taken up by the tissues, but additionally to persist in the bloodstream of ruminants and thus the amounts of rafoxanide and fenbendazole must be carefully selected so as to avoid the occurrence of toxic sequelae, especially in the case of animals which are slaughtered for human consumption. Fenbendazole and its metabolites persist in blood for approximately 4-5 days and in tissues for approximately 14 days.
- rafoxanide there are conflicting reports in the literature on the persistence of rafoxanide in blood ranging from a period of a few days to 28 days and in some cases for as long as 56 days.
- Rafoxanide binds strongly to protein in the blood and although levels persist in blood for some time, in many cases, corresponding tissue levels are not detectable.
- fenbendazole is metabolised in the body to fenbendazole sulphoxide and thence to fenbendazole sulphone.
- the sulphoxide is the chemical entity responsible for the majority of the nematocidal activity.
- the sulphone is non-active anthelmintically, but is formed by conversion from the sulphoxide.
- the invention provides an anthelmintic composition for oral administration, comprising an amount of rafoxanide in admixture with an amount of fenbendazole effective to achieve an elevated plasma level of an active sulphur oxide metabolite of fenbendazole following administration relative to fenbendazole when administered alone.
- the active metabolite of fenbendazole is fenbendazole sulphoxide, which, as indicated above, is the chemical entity mainly responsible for the nematocidal activity of fenbendazole.
- the rafoxanide is present in an amount of 1.5 to 15% w/v and the fenbendazole is present in an amount of 1.0 to 10% w/v.
- Suitable amounts for the respective active ingredients are as follows:
- the rafoxanide is administered at a dose rate in the range 7.5- 15.0 mg/kg body weight and the fenbendazole is administered at a dose rate in the range 5.0- 10.0 mg/kg body weight.
- Suitable dose rates (mg/kg body weight) for the respect active ingredients are as follows:
- each of the active ingredients is micronised.
- the rafoxanide preferably has a particle size range wherein at least 99% by weight has an average particle size less than 20 ⁇ m, at least 90% by weight has an average particle size less than lO ⁇ m and at least 55% by weight has an average particle size less than 5 ⁇ m.
- the fenbendazole preferably has a particle size range wherein at least 98% by weight has an average particle size less than 20 ⁇ m, at least 90% by weight has a particle size less than 15 ⁇ m and at least 50% by weight has a particle size less than 5 ⁇ m.
- composition according to the invention is preferably in the form of a suspension.
- the suspension includes as a suspending agent a gum and/or a pharmaceutically-acceptable, polymeric material with the requisite properties.
- a suitable gum is xanthan gum.
- a suitable polymeric material is polyvinylpyrrolidone also known as Povidone.
- the suspension may also include one or more auxiliary agents selected from a buffering agent, a dispersing agent, a wetting agent, an anti-foaming agent, a preserving agent and a colouring agent secundem art em.
- auxiliary agents selected from a buffering agent, a dispersing agent, a wetting agent, an anti-foaming agent, a preserving agent and a colouring agent secundem art em.
- the pH of the suspension is suitably in the range 4.5-5.5.
- Suitable buffering agents include citric acid monohydrate and disodium hydrogen phosphate or sodium citrate.
- Suitable dispersing agents include colloidal silicon dioxide such as that sold under the Trade Mark Aerosil 200 and/or a non-ionic surfactant such as a polyoxyethylene derivative of a sorbitan ester marketed as Polysorbate 20.
- a suitable wetting agent is propylene glycol.
- a suitable antifoaming agent is simethicone.
- Suitable preserving agents include hydroxybenzoate preservatives such as that sold under the Trade Marks Nipasept sodium, Nipasol and Nipagin M.
- Suitable colouring agents are any colouring agent suitable for oral administration.
- the invention also provides a method of treating or preventing helminth infestation in a ruminant animal, which comprises administering to said animal a composition as hereinbefore defined.
- composition and method according to the invention are especially suitable for the treatment of helminth infestation, including fluke infection in cattle and sheep.
- a suspension containing rafoxanide and fenbendazole was prepared having the following composition:
- a stainless steel tank is filled to circa the 1 ,400 litre mark with deionised water.
- the Nipasept sodium, citric acid monohydrate, disodium hydrogen phosphate and chlorophyll are added followed by thorough mixing with a Silverson EX (Silverson EX is a Trade Mark) fine shear head.
- the mixer is switched off and the Aerosil 200 is added and the mixture is allowed to settle for circa 30-60 minutes.
- the xanthan gum and povidone are blended and gradually added to the main tank.
- the Polysorbate 20 and propylene glycol are weighed into a separate 500 litre tank.
- the rafoxanide and the fenbendazole are added to the latter tank and mixed together with -50-100 litres of deionised water by means of a Silverson EX coarse shear head.
- To the latter mixture is added the simethicone emulsion and the mixture is mixed well to ensure that all of the rafoxanide and fenbendazole is thoroughly wetted.
- the total minimum mixing time is approximately 30 minutes.
- the mixer When the Aerosil has dispersed in the main tank, the mixer is switched on and the rafoxanide-fenbendazole mixture is added to the main tank with continuous mixing during the transfer process. The final mixture is allowed to settle for at least about 1 hour or, indeed, overnight and then is made up to the 1 ,800 litre mark with deionised water.
- Each of the active ingredients is micronised to achieve an average particle size range as hereinbefore specified.
- the pH f the suspension r -epared can be 5 ⁇ 0.5.
- the fenbendazole was obtained from Cipla Ltd., Bombay, India.
- Group 2 Rafoxanide 4.5% at a dose rate of 11.25 mg/kg.
- Group 3 A mixture of fenbendazole 3% and rafoxanide 4.5% at dose rates of 7.5 mg/kg and 1 1.25 mg/kg, respectively.
- the mixture for Group 3 corresponded to the suspension prepared in Example 1.
- Suspensions of active ingredient were also administered to Group 1 and Group 2 which, in each case, corresponded to a suspension as prepared in Example 1 but without rafoxanide and fenbendazole, respectively.
- Plasma concentrations are expressed in ⁇ g/ml.
- the sulphone is non active anthelmintically but is formed by conversion from the sulphoxide. Since the sulphoxide concentrations differed between Groups 1 and 3, the sulphone concentrations were also significantly different at all sampling dates after 0 and 12 hours. The resultant AUC were significantly different (p ⁇ 0.01 ).
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicinal Preparation (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94900983A EP0734258A1 (en) | 1993-12-13 | 1993-12-13 | Anthelmintic composition containing rafoxanide and fenbendazole |
PCT/IE1993/000059 WO1995016447A1 (en) | 1993-12-13 | 1993-12-13 | Anthelmintic composition containing rafoxanide and fenbendazole |
AU12160/95A AU698431B2 (en) | 1993-12-13 | 1993-12-13 | Anthelmintic composition containing rafoxanide and fenbendazole |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IE1993/000059 WO1995016447A1 (en) | 1993-12-13 | 1993-12-13 | Anthelmintic composition containing rafoxanide and fenbendazole |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995016447A1 true WO1995016447A1 (en) | 1995-06-22 |
Family
ID=11042485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IE1993/000059 WO1995016447A1 (en) | 1993-12-13 | 1993-12-13 | Anthelmintic composition containing rafoxanide and fenbendazole |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0734258A1 (en) |
AU (1) | AU698431B2 (en) |
WO (1) | WO1995016447A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5861142A (en) * | 1996-03-25 | 1999-01-19 | Schick; Mary Pichler | Method for promoting hair, nail, and skin keratinization |
EP1129713A1 (en) * | 2000-02-29 | 2001-09-05 | New Pharma Research Sweden AB | Veterinary compositions for the treatment of parasitic diseases |
WO2003072113A1 (en) * | 2002-02-28 | 2003-09-04 | Norbrook Laboratories Limited | Long acting parasiticidal composition containing a salicylanilide compound, a polymeric species and at least one other anti-parasitic compound |
WO2007144362A1 (en) * | 2006-06-14 | 2007-12-21 | Intervet International B.V. | A suspension comprising benzimidazole carbamate and a polysorbate |
RU2445089C2 (en) * | 2006-06-14 | 2012-03-20 | Интервет Интернэшнл Б.В. | Suspension containing benzimidazole carbamate and polysorbate |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2336931A1 (en) * | 1975-12-30 | 1977-07-29 | Dick Pierre | Anthelmintic compsns. contg. benzimidazole deriv(s). - and other anthelmintic(s), with extended activity against digestive tract parasites |
FR2361110A1 (en) * | 1976-08-13 | 1978-03-10 | Wellcome Found | ANTHELMINTHIC MEDICINAL PRODUCTS CONTAINING A SYNERGIC ASSOCIATION OF ACTIVE SUBSTANCES |
EP0202568A1 (en) * | 1985-05-13 | 1986-11-26 | Syntex (U.S.A.) Inc. | Anthelmintic compositions |
-
1993
- 1993-12-13 AU AU12160/95A patent/AU698431B2/en not_active Ceased
- 1993-12-13 EP EP94900983A patent/EP0734258A1/en not_active Withdrawn
- 1993-12-13 WO PCT/IE1993/000059 patent/WO1995016447A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2336931A1 (en) * | 1975-12-30 | 1977-07-29 | Dick Pierre | Anthelmintic compsns. contg. benzimidazole deriv(s). - and other anthelmintic(s), with extended activity against digestive tract parasites |
FR2361110A1 (en) * | 1976-08-13 | 1978-03-10 | Wellcome Found | ANTHELMINTHIC MEDICINAL PRODUCTS CONTAINING A SYNERGIC ASSOCIATION OF ACTIVE SUBSTANCES |
EP0202568A1 (en) * | 1985-05-13 | 1986-11-26 | Syntex (U.S.A.) Inc. | Anthelmintic compositions |
Non-Patent Citations (1)
Title |
---|
D'SOUZA P E ET AL: "CONTROL OF NASAL MYIASIS IN SHEEP WITH RAFOXANIDE", INDIAN VET MED J,, VOL. 16, NO. 1, PAGE(S) 34-36, 1992 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5861142A (en) * | 1996-03-25 | 1999-01-19 | Schick; Mary Pichler | Method for promoting hair, nail, and skin keratinization |
EP1129713A1 (en) * | 2000-02-29 | 2001-09-05 | New Pharma Research Sweden AB | Veterinary compositions for the treatment of parasitic diseases |
WO2001064222A1 (en) * | 2000-02-29 | 2001-09-07 | New Pharma Research Sweden Ab | Veterinary compositions for the treatment of parasitic diseases |
US6777448B2 (en) | 2000-02-29 | 2004-08-17 | New Pharma Research Sweden Ab | Veterinary compositions for the treatment of parasitic diseases |
WO2003072113A1 (en) * | 2002-02-28 | 2003-09-04 | Norbrook Laboratories Limited | Long acting parasiticidal composition containing a salicylanilide compound, a polymeric species and at least one other anti-parasitic compound |
AP1977A (en) * | 2002-02-28 | 2009-03-19 | Norbrook Lab Ltd | Long acting parasiticidal composition |
US9289380B2 (en) | 2002-02-28 | 2016-03-22 | Norbrook Laboratories Limited | Long acting parasiticidal composition containing a salicylanilide compound, a polymeric species and at least one other anti-parasitic compound |
WO2007144362A1 (en) * | 2006-06-14 | 2007-12-21 | Intervet International B.V. | A suspension comprising benzimidazole carbamate and a polysorbate |
JP2009539933A (en) * | 2006-06-14 | 2009-11-19 | インターベツト・インターナシヨナル・ベー・ベー | Suspension containing benzimidazole carbamate and polysorbate |
RU2445089C2 (en) * | 2006-06-14 | 2012-03-20 | Интервет Интернэшнл Б.В. | Suspension containing benzimidazole carbamate and polysorbate |
KR101403135B1 (en) * | 2006-06-14 | 2014-06-19 | 인터벳 인터내셔널 비.브이. | A suspension comprising benzimidazole carbamate and a polysorbate |
US8777134B2 (en) | 2006-06-14 | 2014-07-15 | Intervet International B.V. | Suspension comprising benzimidazole carbamate and a polysorbate |
Also Published As
Publication number | Publication date |
---|---|
AU1216095A (en) | 1995-07-03 |
EP0734258A1 (en) | 1996-10-02 |
AU698431B2 (en) | 1998-10-29 |
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