US20120076838A1 - Poorly soluble drug containing microsphere with improved bioavailabilty and method of preparing the same - Google Patents

Poorly soluble drug containing microsphere with improved bioavailabilty and method of preparing the same Download PDF

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US20120076838A1
US20120076838A1 US13/322,549 US201013322549A US2012076838A1 US 20120076838 A1 US20120076838 A1 US 20120076838A1 US 201013322549 A US201013322549 A US 201013322549A US 2012076838 A1 US2012076838 A1 US 2012076838A1
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water
poorly soluble
soluble drug
polymer carrier
organic solvent
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Kyung-Hee Kim
Hyun-Ki Lee
Jun- Seok Hwang
Su-long Hwang
Chaul-Min Pai
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Samyang Biopharmaceuticals Corp
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Samyang Biopharmaceuticals Corp
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Assigned to SAMYANG BIOPHARMACEUTICALS CORPORATION reassignment SAMYANG BIOPHARMACEUTICALS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HWANG, JUN-SEOK, HWANG, SU-JONG, KIM, KYUNG-HEE, LEE, HYUN-KI, PAI, CHAUL-MIN
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    • 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
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1682—Processes
    • A61K9/1694—Processes resulting in granules or microspheres of the matrix type containing more than 5% of excipient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1605—Excipients; Inactive ingredients
    • A61K9/1629—Organic macromolecular compounds
    • A61K9/1635—Organic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyvinyl pyrrolidone, poly(meth)acrylates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K31/33—Heterocyclic compounds
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    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
    • A61K31/519—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with heterocyclic rings
    • A61K31/52—Purines, e.g. adenine
    • A61K31/522—Purines, e.g. adenine having oxo groups directly attached to the heterocyclic ring, e.g. hypoxanthine, guanine, acyclovir
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    • 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
    • A61K47/34—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyesters, polyamino acids, polysiloxanes, polyphosphazines, copolymers of polyalkylene glycol or poloxamers
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    • 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
    • A61K47/38—Cellulose; Derivatives thereof
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1605—Excipients; Inactive ingredients
    • A61K9/1629—Organic macromolecular compounds
    • A61K9/1652—Polysaccharides, e.g. alginate, cellulose derivatives; Cyclodextrin
    • A—HUMAN NECESSITIES
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    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/06—Antihyperlipidemics
    • 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
    • A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
    • A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
    • A61K31/216—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acids having aromatic rings, e.g. benactizyne, clofibrate
    • A—HUMAN NECESSITIES
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    • A61K31/21—Esters, e.g. nitroglycerine, selenocyanates
    • A61K31/215—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids
    • A61K31/22—Esters, e.g. nitroglycerine, selenocyanates of carboxylic acids of acyclic acids, e.g. pravastatin
    • A—HUMAN NECESSITIES
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    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K31/33—Heterocyclic compounds
    • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
    • A61K31/365—Lactones
    • A61K31/366—Lactones having six-membered rings, e.g. delta-lactones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • 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
    • A61K31/4178—1,3-Diazoles not condensed 1,3-diazoles and containing further heterocyclic rings, e.g. pilocarpine, nitrofurantoin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • 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
    • 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
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/4353—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems
    • A61K31/436—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems the heterocyclic ring system containing a six-membered ring having oxygen as a ring hetero atom, e.g. rapamycin
    • 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
    • A61K31/57—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone

Definitions

  • the present invention relates to a poorly soluble drug containing microsphere, a pharmaceutical composition comprising the same, and a method of preparing the same. More specifically, to a poorly soluble drug containing microsphere with improved bioavailability of the poorly soluble drug, an oral formulation comprising the same, and a method of preparing the same.
  • a method of increasing solubility of the existing poorly soluble drugs includes chemical modification and physical modification.
  • the chemical modification includes salt addition, aqueous prodrug approach, and the like
  • the physical modification includes modification of particle size or crystal form, formation of crystalline polymorph, formation of complex using a surfactant or cyclodextrin, drug dispersion using a dispersant, and the like.
  • drug formulation methods such as micronization, noncrystallization, solid dispersion formation, and the like have been suggested, among which solid dispersion formation has been widely examined as a means for dispersing a drug in an inactive carrier.
  • a solvent method is a practical method.
  • a drug and an aqueous polymer carrier are dissolved in a solvent such as an organic solvent, and the like, and the solvent is removed by distillation, or a drug is dissolved in a solvent and dispersed in a carrier, and then, the solvent is removed by distillation to prepare a solid dispersion.
  • Fenofibrate (2-[4-(4-chlorobenzoyl)phenoxy]-2-methyl-propanoic acid, 1-methylethyl ester) is one of fibrate drugs.
  • fibrate drugs There have been a lot of efforts to improve a fenofibrate formulation, particularly bioavailability of fennofibrate.
  • U.S. Pat. No. 4,895,726 and U.S. Pat. No. 5,880,148 disclose that fenofibrate is co-micronized with a surfactant.
  • U.S. Patent No. 20030224059 discloses a micronized particle formed of an active pharmaceutical ingredient having low water solubility and a solid solution of a sublimable carrier, a drug delivery vehicle comprising the same, and a preparation method thereof.
  • Micronization of fenofibrate or combination of a surfactant and micronized fenofibrate may increase bioavailability of fenofibrate to some degree, thus decreasing administration amount thereof while maintaining the bioavailability at eating.
  • practical bioavailability of fenofibrate is still low and the use of a surfactant may induce toxicity to human body, there is still a demand for the improvement.
  • the present invention provides a technology capable of remarkably increasing water solubility in order to increase bioavailability of a poorly soluble drug.
  • One aspect of the present invention provides a poorly soluble drug containing microsphere in the form of a solid dispersion wherein the poorly soluble drug is dispersed in an aqueous polymer carrier in a noncrystalline form by spray drying.
  • Another aspect provides an oral formulation comprising the poorly soluble drug containing microsphere.
  • Yet another aspect provides a method of manufacturing a poorly soluble drug containing microsphere comprising a) dissolving a water-soluble polymer carrier and a poorly soluble drug in water and an organic solvent to prepare a mixed solution; and b) spray drying the mixed solution.
  • FIG. 1 is a dissolution result graph of Experimental Example 1,
  • FIG. 2 is an SEM photograph of the microsphere of Example 5
  • FIG. 3 is a dissolution result graph of Experimental Example 2
  • FIG. 4 is a dissolution result graph of Experimental Example 3
  • FIG. 5 is a dissolution result graph of Experimental Example 4,
  • FIG. 6 is a dissolution result graph of Experimental Example 5
  • FIG. 7 is a dissolution result graph of Experimental Example 6.
  • the present invention provides a poorly soluble drug containing microsphere in the form of a solid dispersion wherein a poorly soluble drug is dispersed in a water-soluble polymer carrier in a noncrystalline form by spray drying.
  • the present invention also provides a method manufacturing the poorly soluble drug containing microsphere comprising dissolving a water-soluble polymer carrier and a poorly soluble drug in water and an organic solvent to prepare a mixed solution; and spray drying the mixed solution.
  • the present invention uses water and an organic solvent together to completely dissolve a poorly soluble drug and an a water-soluble polymer, and obtains a microsphere by spray drying the completely dissolved solution.
  • the poorly soluble drug containing microsphere of the present invention the poorly soluble drug is dispersed in a noncrystalline form in a water-soluble polymer carrier, by spray drying a mixed solution wherein the water-soluble polymer carrier and the poorly soluble drug are dissolved in water and an organic solvent.
  • One aspect of the invention relates to a poorly soluble drug containing microsphere in the form of a solid dispersion wherein the poorly soluble drug is dispersed in a water-soluble polymer carrier in a noncrystalline form, which is obtained by spray drying a mixed solution comprising the poorly soluble drug, the water-soluble polymer carrier, water and an organic solvent.
  • the mixed solution may be a mixed solution of an aqueous solution of the water-soluble polymer carrier dissolved in water and a solution of the poorly soluble drug dissolved in the organic solvent; or a mixed solution wherein the poorly soluble drug is dissolved in a solution of the water-soluble polymer carrier dissolved in a mixed solvent of the organic solvent and water.
  • the poorly soluble drug may have water solubility of less than 1-10 mg/ml.
  • One example may include a drug corresponding to BCS (Biopharmaceutics Classification System) class IV, and the specific examples may include acyclovir, allopurinol, amiodarone, azathioprine, benazepril, calcitriol, candesartan, eprosartan, carbidopa/levidopa, clarithromycin, clozapine, desmopressin acetate, diclofenac, enalapril, famotidine, felodipine, fenofibrate, fentanyl, fexofenadine, fosinopril, furosemide, glyburide, hyoscyamine, imipramine, itraconazole, levothyroxine, atorvastatin, lovastatin, meclizine, megesterol, mercaptopur
  • the water-soluble polymer carrier may include any carriers as long as it may be commonly used for improving solubility of a poorly soluble drug. According to one embodiment of the invention, it may include pharmaceutically acceptable water-soluble polymer, specifically one or more selected from the group consisting of hydroxypropylmethylcellulose (HPMC, for example, those having weight average molecular weight of about 10,000 to 1,500,000), polyethyleneglycol (PEG, for example, those having weight average molecular weight of 3,000 to 9,000), polyvinylpyrrolidone (PVP, for example, those having weight average molecular weight of 2,500 to 2,500,000), cellulose, and a combination thereof, more specifically, HPMC.
  • HPMC hydroxypropylmethylcellulose
  • PEG polyethyleneglycol
  • PVP polyvinylpyrrolidone
  • the poorly soluble drug is dispersed in the water-soluble polymer carrier in a noncrystalline form.
  • the hydroxypropylmethylcellulose may be those wherein about 16.5 to 30% specifically about 28 to 30% of hydroxyl groups are methoxylated, and about 4 to 32%, specifically about 7 to 12% of hydroxy groups are substituted by hydroxyl propyl groups.
  • the HPMC may have an average molecular weight of 10,000 to 1,500,000 g/mol.
  • the weight ratio of the poorly soluble drug and the water-soluble polymer carrier in the microsphere may be 1:1 to 1:15, preferably 1:1 to 1:10, most preferably 1:1 to 1:5. If the water-soluble polymer carrier is less than 1:1, drug may not be sufficiently dispersed and thus solubility may not be improved. And, if it exceeds 1:15, viscosity may be increased due to the water-soluble carrier thus causing a problem in performing spray drying, while solubility may not be increased no longer.
  • the microsphere may further include at least one selected from the group consisting of a disintegrating agent, a stabilizer, and pharmaceutically acceptable lubricant, an opacifier, a colorant, pharmaceutically acceptable excipient, and the like, specifically talc.
  • the content of the excipient may be 0.01 to 10 wt %, preferably 1 to 5 wt %, based on total weight of a mixed solution comprising a poorly soluble drug, a water-soluble polymer carrier, water and an organic solvent. If the content is lower than the above range, satisfactory excipient function may not be obtained, and if it exceeds the above range, it may deteriorate microsphere properties.
  • the microsphere containing the poorly soluble drug dispersed in a noncrystalline form of the present invention may have an uniform sphere size, and have a particle size (average particle diameter) of 500 ⁇ m or less, specifically 350 ⁇ m or less, more specifically 100 ⁇ m or less.
  • the average particle diameter of the microsphere may be 1 ⁇ m to 500 ⁇ m, specifically, 10 ⁇ m to 350 ⁇ m, more specifically 10 ⁇ m to 100 ⁇ m.
  • the present invention provides a method of manufacturing a microsphere comprising a) dissolving a poorly soluble drug and a water-soluble polymer carrier in an organic solvent and water to prepare a mixed solution; and b) spray drying the mixed solution.
  • a relatively spherical microsphere may be smoothly formed by spray drying of a mixed solution where the poorly soluble drug and a water-soluble polymer are dissolved, without using a seed for forming particles. And, by simultaneously using an organic solvent and water, a poorly soluble drug may be uniformly dispersed in a water-soluble polymer carrier without using a surfactant which is commonly used for improving solubility and may induce toxicity to human body.
  • a particle is commonly prepared by coating on a seed.
  • a seed or particle is included in a solution, it may be difficult to spray dry while uniformly dispersing, and thus, uniformity of mixing may not be secured.
  • a fluidized bed coating method is applied using mixing uniformity, a lot of time and cost may be required. Therefore, to form relatively spherical uniform particles without a seed, it may be necessary to appropriately control process conditions when spray drying.
  • the kind and content of the poorly soluble drug and the water-soluble polymer carrier used in the manufacturing step are as explained above.
  • the organic solvent may be selected from the group consisting of C 1 - C 4 linear or branched alcohol (for example, ethanol, methanol, and the like), dichloromethane, and a combination thereof, preferably ethanol.
  • the organic solvent and water may be mixed after the organic solvent is used for dissolving a poorly soluble drug and the water is used for dissolving the water-soluble polymer carrier, or they may be used for dissolving the water-soluble polymer carrier and the poorly soluble drug in the form of a mixed solvent (co-solvent) of water and organic solvent.
  • the weight ratio of the organic solvent and water may be 0.5:1 to 5:1, preferably 1:1 to 3:1 (weight of organic solvent:weight of water).
  • the water-soluble polymer carrier may be not dissolved. And if the content of the water is greater than the above range, drug may be precipitated. And, if the carrier is not completely dissolved in the solvent, spraying may become difficult due to high viscosity, and uniform particles may not be obtained. However, if water and the organic solvent are simultaneously used in the present invention, the water-soluble polymer carrier and the poorly soluble drug may be completely dissolved in a solvent and thus facilitating spray drying.
  • the concentration of the poorly soluble drug and the water-soluble polymer carrier may be 1 to 20 wt %, specifically 3 to 15 wt %, more specifically 5 to 10 wt %. If the concentration of the drug and the polymer is less than 1 wt %, spray drying time may become long, and if it exceeds 20wt %, spray drying may not be conducted due to high viscosity.
  • the step a) may comprise dissolving the water-soluble polymer carrier in water to prepare an aqueous solution of the polymer carrier, dissolving the poorly soluble drug in an organic solvent to prepare a solution of the poorly soluble drug, and mixing the aqueous solution of the polymer carrier and the solution of the poorly soluble drug to prepare the mixed solution.
  • it may comprise dissolving the water-soluble polymer carrier in a co-solvent of water and an organic solvent to prepare a solution of the polymer carrier, and dissolving the poorly soluble drug in the polymer carrier solution to prepare a mixed solution.
  • the mixed solution of the step a) is spray dried, and the spray method may be conducted using a nozzle type spray drier or an atomizer type spray drier, and the like.
  • injection temperature may be 80 to 120°C., specifically 90 to 110° C.
  • injection speed may be 1 to 10 ml/min, specifically 3 to 5 ml/min.
  • spray temperature may be controlled to 80 to 120° C., specifically 90 to 110° C.
  • spray speed may be 3,000 to 5,000 rpm, specifically 3,500 to 4,500 rpm
  • injection speed of the mixed solution may be 10 to 100 ml/min, specifically 40 to 70 ml/min. If the atomizer type spray drier is used, uniform particles may be prepared and thus it may be advantageous for improving dissolution.
  • excipient comprising talc may be added to the mixed solution, before the step a) spraying of the mixed solution.
  • the content of the excipient may be 0.01 to 10 wt %, preferably 1 to 5 wt % based on total weight of the mixed solution. If the content of the excipient is less than the above range, satisfactory excipient function may not be obtained, and if it exceeds the above range, microsphere properties may be deteriorated.
  • Another aspect of the invention is related to an oral formulation comprising the microsphere.
  • the microsphere may be prepared as an oral formulation.
  • pharmaceutically acceptable excipient, disintegrating agent, a binder, a colorant, a stabilizer, a sweetener, lubricant, and the like may be added to the prepared microsphere, to prepare powder, a granule, a capsule, a tablet, and the like.
  • a preferable dosage form is a tablet. If the microsphere is prepared in the form of a tablet, a coating agent and/or a plasticizer may be contained according to a common method to formulate the tablet in the form of a fast dissolving oral tablet or a coating tablet.
  • the dosage of the poorly soluble drug may be varied according to the kinds of drug, the kind and severity of disease, age of a patient, and the like.
  • the poorly soluble drug containing microsphere of the present invention is a microsphere in the form of a solid dispersion wherein the poorly soluble drug is dispersed in a water-soluble polymer carrier in a noncrystalline form. It may remarkably improve solubility compared to a dosage form for improving solubility using a micronized poorly soluble drug. And, according to the present invention, a spherical spray dried microsphere may be prepared without a seed, and a surfactant that may induce toxicity to human body is not used for improving solubility.
  • a composition comprising a poorly soluble drug containing microsphere wherein fenofibrate is dispersed in a water-soluble polymer carrier in a noncrystalline form, which is prepared by spray drying, simultaneously using an organic solvent and water.
  • the microsphere may comprise the fenofibrate and the water-soluble polymer carrier in the weight ratio of 1:1 to 1:15, preferably 1:1 to 1:10, most preferably 1:1 to 1:5, thereby showing the following dissolution pattern.
  • it may exhibit a dissolution pattern that 10 wt % or more, preferably 20 wt % or more of contained fenofibrate is dissoluted within 5 minutes, 30 wt % or more, preferably 50 wt % or more is dissoluted within 15 minutes, and 40 wt % or more, preferably 70 wt % or more is dissoluted within 30 minutes, when tested according to the second method (paddle method: 100 rotations per minute, tertiary distilled water 500 ml) of Korean Pharmacopoeia 9 th Revision.
  • the poorly soluble drug containing microsphere of the present invention may improve water solubility of poorly soluble drug, and thereby, improve bioavailability of the poorly soluble drug.
  • the solution was spray dried with a nozzle type spray drier (Mini spray dryer B-290, Buchi) at a injection temperature of 90° C. and injection amount of 3 mL/min, to obtain a fenofibrate containing microsphere of a relative spherical shape with an average particle size of 50 ⁇ m.
  • a nozzle type spray drier Mini spray dryer B-290, Buchi
  • the solution was spray dried with an atomizer type spray drier (DJE-003R, Donjin Spray Drying Technology), at a spray temperature of 110° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm, to obtain a fenofibrate containing microsphere of a relatively spherical shape with a size of 50 ⁇ m.
  • DJE-003R Donjin Spray Drying Technology
  • Crystalline fenofibrate was used as it is instead of being made into a microsphere.
  • a fenofibrate containing microsphere was to be prepared with an atomizer type spray drier using only ethanol or only water as a solvent, using the same amounts of fenofibrate, HPMC and a solvent as Example 2.
  • HPMC and fenofibrate could not be dissolved in only ethanol or in only water, and thus, a microsphere could not be prepared.
  • Example 2 For the microspheres obtained in Example 1, Example 2 and Comparative Example 1, dissolution test was performed under the following conditions, and the results are shown in FIG. 1 .
  • Dissolution test conditions are as follows.
  • Example 1 The poorly soluble drug containing microspheres with uniform distribution (Examples 1 and 2) exhibited excellent dissolution compared to the crystalline poorly soluble drug (Comparative Example 1), in vitro dissolution test.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 110° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm, to obtain a fenofibrate containing microsphere of a relatively spherical shape with a size of 50 ⁇ m.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 110° C., injection amount of 36 mL/min, and atomizer speed of 3,500 rpm, to obtain a fenofibrate containing microsphere of a relatively spherical shape with a size of 50 ⁇ m.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 100° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm. It is confirmed by SEM that the microsphere prepared in Example 5 has a particle size of 50 ⁇ m or less ( FIG. 2 )
  • HPMC was put in a mixed solvent of water and ethanol and properly mixed, and then, fenofibrate was introduced therein and agitated to completely dissolve, thus preparing a yellowish clear mixed solution, which was allowed to stand so that bubbles may disappear.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 100° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm. It was confirmed that the microsphere prepared in Example 6 has a particle size of 50 ⁇ m or less.
  • the particles of Examples 3 to 5 exhibited very excellent initial dissolution rate.
  • the poorly soluble drug microspheres of Example 4 and Example 5 exhibited 80% or more dissolution without rapid decrease in solubility until 1 hour, and the difference in dissolution rate between the two groups was not significant.
  • dissolution rate was nearly 0 even until 1 hour has elapsed, and thus, it can be seen that dissolution hardly occurs.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 100° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm, to obtain a simvastatin microsphere in the form of a solid dispersion of a relatively spherical shape with a size of 50 ⁇ m.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 100° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm, to prepare a candesartan microsphere in the form of a solid dispersion of a relatively spherical shape. It was confirmed that the prepared microsphere has a particle size of 50 ⁇ m.
  • in vitro dissolution test was performed by the same method as Experimental Example 1 and the result was shown in FIG. 5 .
  • the existing commercialized formulation “Atacand®” Comparative Example 5, AstraZeneca Korea
  • the microsphere of the present invention has remarkably excellent dissolution rate compared to Comparative Example 5.
  • Example 8 The solution was tested by the same method as Example 8 and Experimental Example 4, and the result was shown in FIG. 6 .
  • the existing commercialized formulation “Atacand®” (Comparative Example 5) was used.
  • the microsphere of the present invention has excellent dissolution rate compared to Comparative Example 5.
  • HPMC the same one as used for fenofibrate was used.
  • the solution was spray dried with an atomizer type spray drier at a spray temperature of 100° C., injection amount of 45 mL/min, and atomizer speed of 3,500 rpm, to prepare a tacrolimus microsphere in the form of a solid dispersion of a relatively spherical shape. It can be seen that the prepared microsphere has a particle size of 50 ⁇ m or less.
  • in vitro dissolution test was performed by the same method as Experimental Example 1, and the result was shown in FIG. 7 .
  • the existing solubility improving agent “Prograf®” Comparative Example 6, Astellas
  • the microsphere of the present invention has excellent dissolution rate compared to Comparative Example 6.

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