Classifications

• • 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
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0014—Skin, i.e. galenical aspects of topical compositions
• • 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
  • A61K31/63—Compounds containing para-N-benzenesulfonyl-N-groups, e.g. sulfanilamide, p-nitrobenzenesulfonyl hydrazide
  • A61K31/635—Compounds containing para-N-benzenesulfonyl-N-groups, e.g. sulfanilamide, p-nitrobenzenesulfonyl hydrazide having a heterocyclic ring, e.g. sulfadiazine
• • 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
  • A61K47/02—Inorganic compounds
• • 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
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
• • 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
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/08—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
  • A61K47/10—Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
• • 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
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/06—Ointments; Bases therefor; Other semi-solid forms, e.g. creams, sticks, gels
• • 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
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
  • A61K9/5005—Wall or coating material
  • A61K9/501—Inorganic compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
  • A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P15/00—Drugs for genital or sexual disorders; Contraceptives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/04—Centrally acting analgesics, e.g. opioids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

• the present invention is related to transdermal formulations containing COX-inhibitors.
• Transdermal formulations e.g., gels
• Such formulations offer a possibility for administering medicines to patients who have difficulty in swallowing oral formulations or in cases when prolonged parenteral medication should be replaced.
• Such formulations furthermore offer the possibility of localized administration of the medicament thus preventing side effects and are suitable for the administration of active ingredients which are metabolized rapidly and extensively subsequent to oral administration.
• transdermal gel formulations that deliver active compounds that are anti-inflammatory and/or pain relieving pharmaceutically active compounds, e.g., COX inhibitors, or selective COX inhibitors, e.g., COX-2 inhibitors, preferably, celecoxib, deracoxib, valdecoxib, rofecoxib, tilmacoxib, or other similar known compounds, especially celecoxib, including its various known crystalline forms and various salts thereof, e.g., crystalline forms I, II, III, IV and N.
• active compounds e.g., COX inhibitors, or selective COX inhibitors, e.g., COX-2 inhibitors, preferably, celecoxib, deracoxib, valdecoxib, rofecoxib, tilmacoxib, or other similar known compounds, especially celecoxib, including its various known crystalline forms and various salts thereof, e.g., crystalline forms I, II, III, IV and N.
• Transdermal pharmaceutical formulations are characterized in vitro by the measurement of the permeation of the active ingredient through natural or artificial membranes or in vivo by skin penetration studies. Such a measurement method and apparatus developed are disclosed in WO2010089619.
• the delivery of COX-2 inhibitors, especially topically, has many challenges, as these compounds have a very low solubility, high melting point, and low penetration potential in known topical formulations that have acceptable organoleptic (sensory) characteristics.
• the formulation exhibit suitable skin penetration to achieve the required therapeutical objective and advantageous organoleptic properties, such as suitable consistency without adherence (sticking) to the skin or clothing, appropriate viscosity, agreeable odour and good spreadability.
• the formulation should have good physical-chemical stability, especially in the cold, and microbiological stability.
• the formulation should also improve the solubility of the active ingredient.
• said formulations should be easily manufacturable on an industrial scale.
• the transdermal formulation according to the present invention is a gel composition which comprises an active ingredient which is a COX inhibitor, preferably a selective COX-2 inhibitor, a solubilizer, a wetting agent, a gel forming agent, a volatile siloxane agent and a solvent.
• the formulation may also contain a permeation enhancing agent and a precipitating agent.
• the drugs preferred in the formulations according to the present invention are selective COX-2 inhibitors, which are known to be useful for treating inflammation, colorectal polyps (because they have effects on abnormally dividing cells such as those of precancerous colorectal polyps), menstrual cramps, sports injuries, osteoarthritis, rheumatoid arthritis, and pain, e.g., acute pain, and for reducing the risk of peptic ulceration.
• the embodiments of the invention are suitable for use with crystalline or amorphous forms of active ingredients.
• the preferred drug of the formulations is Celecoxib, which is a selective COX-2 inhibitor having about 7.6-times higher affinity towards COX-2 than towards COX-1. Thus the antiinflammatory activity of celecoxib is only rarely accompanied with gastrointestinal side effects which are often experienced with non-selective non-steroidal antiinflammatory active ingredients.
• the invention also includes the use of the formulations for the indications known for the active ingredient.
• a method of treating inflammation, colorectal polyps, menstrual cramps, sports injuries, osteoarthritis, rheumatoid arthritis, and pain, e.g., acute pain, and of reducing the risk of peptic ulceration, by administering a composition disclosed herein topically is included in the invention.
• the advantage of the formulation according to the present invention resides in that it provides a way for convenient local administration of a stabile COX-2 inhibitor medicament, for example, for relieving pain while preventing side effects which may occur subsequent to oral administration.
• the formulation according to the present invention contains the following ingredients in the following amounts (the amounts and percentages of amounts discussed in the present application are by weight, based on the composition as a whole unless indicated otherwise): I) an active compound, e.g., a COX inhibitor, preferably a COX-2 inhibitor, e.g., celecoxib, deracoxib, valdecoxib, rofecoxib, and/or tilmacoxib, especially celecoxib, and particularly preferably a crystalline form thereof.
• the active ingredient is preferably in a particulate form.
• the active ingredient does not have to be micronized, but in preferred embodiments, micronized forms are advantageous to further enhance the solubility of the active ingredient. Nevertheless it is possible to produce delivery systems according to the present invention wherein the active ingredient is partly or fully dissolved.
• the amount of active compound e.g., of celecoxib, should be 0.5-10%, preferably 1- 6%, more preferably 1.5-5%, and especially preferably about 2%.
• a compound or a natural mixture capable of enhancing the penetration of the active ingredient e.g. celecoxib may be present, including but not limited to menthol, thymol, essential oils such as lavender oil or kernel oils, such as almond oil and vegetable oils etc.
• menthol e.g. menthol
• thymol e.g. thymol
• essential oils such as lavender oil or kernel oils, such as almond oil and vegetable oils etc.
• the presence of a penetration enhancing agent is preferred.
• Terpene compounds may also be useful as penetration enhancers, such as isobomeol, irone, ocimene, carveol, carvotanacetone, carvomenthone, carvone, carene, carone, camphene, camphor, geraniol, cymene, sabinene, safranal, cyclocitral, citral, citronellal, citronellic acid, citronellol, cineole, sylvestrene, thujyl alcohol, thujone, terpineol, terpinene, terpinolene, tricyclene, nerol, pinene, pinocampheol, pinol, piperitenone, phellandral, phellandrene, fenchene, fenchyl alcohol, perillyl alcohol, perillyl aldehyde, borneol, myrcene,
• an essential oil or natural mixture should be concerns of allergies, aroma, e.g., bad smell versus pleasant smell, the potential of the compound to irritate the skin, potential in causing adverse effects etc.
• aroma e.g., bad smell versus pleasant smell
• the potential of the compound to irritate the skin potential in causing adverse effects etc.
• Preferred among the options is menthol and lavender oil, especially menthol.
• the amount of the penetration enhancing compound e.g., of menthol or lavender oil, especially menthol is 0.5-10%, preferably 0.7-5%, more preferably 1-2%, and especially preferably about 1%.
• Solubilizers are well known in the state of the art. Applicants have found that in the formulation according to the present invention, the solubilizers can be preferably selected from polyethylene glycols, sorbitol esters with fatty acids, pegylated sorbitol esters with fatty acids (polysorbates), polyethylene glycol alkylethers, polyoxyethylene and polyoxypropylene block polymers and silicone alkyl glycols.
• solubilizing ability of the system is generally significantly improved over the use of a single solubilizer.
• HLB hydrophilic-lipophilic balance
• the solubilizers Tween 60, Brij-58, Kolliphor P-407 can be used as a single solubilizer or as components of a solubilizer system in the formulation according to the present invention.
• Brij-58 also known as polyethylene glycol hexadecyl ether or polyoxyethylene (20) cetyl ether
• a solubilizer known as Brij-58 is particularly suitable for the solubility enhancement of COX-2 inhibitor compounds, especially of celecoxib.
• the amount of Brij-58 is in the range of 3-25%, preferably 4-15%, more preferably 5- 10%, and especially preferably about 7%.
• the solubilizer used in the formulation is Brij-58. It is particularly advantageous to use of the combination of Brij-58 with Kolliphor
• P407 which is also known as Poly(ethylene glycol)-block-poly(propylene glycol) -block- poly( ethylene glycol). Said combination results in enhanced solubilizing effect, especially in an increase in the physical stability of the formulation wherein the active ingredient is in the dissolved state, and is unexpectedly better for such formulations than other solubilizers alone or in combination, for example, the combination of Tween 60 and ethanol. Further advantageous combinations of solubilizers include but are not limited to the combination of polyethylene glycol 1000 (PEG 1000) and Brij-58 and PEG 1000, Brij-58 and Kolliphor P407.
• Alternate combinations include Tween 60, which is also known as Polyoxyethylene (20) sorbitan monostearate, with either Brij-58 or Kolliphor P407, or other combinations where both solubilizers have HLB values above 10, preferably above 12, e.g., 13, and more preferably about 14-20.
• Kolliphor P407 is its ability to act as a thickening agent and/or gel binder.
• Solubilizers that may additionally be included in the solubilizer system are Span 60 and Emulsifier 10. Some of the solubilizers known from the prior art have been found inadequate alone in enhancing the solubility of the active compounds to the desired extent, but may provide some benefit when in combination with a solubilizer having a high HLB value.
• the amount of an individual component thereof can be approximately the same as when used alone.
• the amount of Brij-58 in the solubilizer system is the same as when used alone.
• the amount of each of the solubilizers in the system can be the same.
• the amount of Kolliphor P407 in the combination or even when used alone is in the range of 3- 25%, preferably 4-15%, more preferably 5-10%, and especially preferably about 7%.
• the ratio by weight of the each solubilizer in a solubilizer system can be from 1:10 to 10:1, preferably 1:5 to 5:1, more preferably 1:2 to 2:1, and especially preferably 1:1.
• Kolliphor P407 and Brij-58 for example, in a 1 :1 mixture results in increased physical stability of the formulation wherein the active ingredient is in dissolved form.
• a wetting agent or lubricant e.g., Polyethylene glycol (PEG).
• PEG Polyethylene glycol
• PEG 1000 any PEG 200 to PEG 20,000 may be used.
• Preferable polyethylene glycols are those having a molecular weight equal or less than 1000 and are liquids or of semisolid state.
• PEG 1000 improves the handling properties of the ingredients of the formulation which can be dissolved in PEG 1000 even in cold temperatures.
• increasing the concentration of PEG 400 from, for example, 10% to 20% neither improves stability nor membrane permeation, and therefore PEG was believed to be not regardable as a solvent, e.g., true solubilizer, in the formulations of the invention.
• the unexpected increase in the solubilizing effect and membrane permeation is the likely the result of the addition of the combination of Kolliphor P407 and Brij-58, which may be even further enhanced, e.g., by PEG or other solubilizers and/or wetting agents, and/or the permeation enhancing component, such as menthol.
• PEG in addition to serving as a wetting agent also appears to enhancing the solubility of the active ingredient, e.g., of celecoxib.
• the amount of PEG preferably of PEG 1000, is in the range of 2-25%, preferably 5- 20%, more preferably 8-15%, and especially preferably about 10%.
• Carbopol 980 also known as polymerized prop-2-enoic acid ester.
• Carbopol 980 is a polymer that is a highly efficient thickener and is ideal for formulating clear aqueous and hydro- alcoholic gels.
• Other gel forming agents known from the state of the art are possible in addition to or alternate to Carbopol 980.
• the amount of gel forming agent can be low, as long as sufficient to provide for the formation of a gel.
• the amount is in the range of 0.1-2%, preferably 0.2-1.5%, more preferably 0.3-1%, and especially preferably about 0.5%.
• a precipitation agent or pH adjuster e.g., a sodium hydroxide aqueous solution
• a precipitation agent or pH adjuster e.g., a sodium hydroxide aqueous solution
• additional or alternate precipitation agents may be useful in the formulations.
• a precipitation agent sodium hydroxide (NaOH) solution it is possible to use the precipitation agent sodium hydroxide (NaOH) solution in order to obtain a gel.
• NaOH sodium hydroxide
• a different precipitating agent known from the state of the art may be necessary.
• no precipitation agent is required.
• the strength of the precipitation agent or pH adjuster solution can vary, but is preferably 10 m/v%.
• the amount of precipitating agent should be sufficient to bring about a pH of 5.5-7.5 for the gel forming agent swollen in water, and is typically in the range of 0.5-2%, preferably 0.7- 1.5%, more preferably 0.8- 1.2%, and especially preferably about 1 %.
• a volatile siloxane agent preferably present as a coating on the surface of active ingredient particles or preferably a siloxane coating agent system having at least two volatile siloxane coating agent components, which are used to coat the active ingredient particles.
• the volatile siloxane coating agent should be highly volatile to be able to evaporate from the skin upon application.
• WO2009007764 and WO2010089617 disclose transdermal gel formulations, which are dispersions of solid active ingredient particles coated with a highly volatile siloxane or with a mixture of such siloxanes in aqueous gels.
• the siloxanes as defined regarding their volatility and which are disclosed in these applications, i.e., hexamethyldisiloxane, octamethyltrisiloxane and decamethylcyclopentasiloxane, are useful in the present invention for the coating of active compound particles.
• Other compounds capable of coating a particulate ingredient and evaporating upon application to the skin are also useful instead of the above siloxane compounds.
• Particularly advantageous volatile siloxanes for coating the particles of the active ingredients are apolar, non-functionalized siloxanes, i.e. they do not contain any polar functional group.
• the formulation contains Silicone Fluid 0.65 cSt (hexamethyldisiloxane) and StCyclomethicone 5-NF (decamethylcyclopentasiloxane) .
• Embodiments including St-Cyclomethicone 5-NF have improved organoleptic properties.
• the amount of Silicone Fluid 0.65 cSt when used in the combination and even when used alone is in the range of 1-25%, preferably 5-20%, more preferably 8-15%, and especially preferably about 10%.
• the amount of St-Cyclomethicone 5-NF when used in the combination and even when used alone is in the range of 1-25%, preferably 3-15%, more preferably 4-10%, and especially preferably about 5%.
• the amount of siloxane used should be sufficient to adequately coat the active ingredient particles to avoid their intermixing with the gel matrix containing solubilizers and penetration enhancing components before the evaporation of the siloxane coating upon application to the skin. Too low an amount could lead to the partial dissolution of the active ingredient particles thus affecting skin penetration and stability.
• the ratio by weight of the siloxane coating agents can be from 1 : 10 to 10: 1 , preferably 1:5 to 5:1, most preferably 1 :2 to 2: 1 , including 1:1.
• the above formulation will include additional solvents to water, for example, various alcohols, etc. Additional ingredients in the composition are possible, as long as they do not negatively affect the effectiveness or organoleptic characteristics thereof.
• the composition may additionally contain colorants, fragrances, additional cosmoceuticals or nutriceuticals. Such compounds are known from the prior art.
• composition of the invention contains a selective COX-2 inhibitor compound
• At least one compound capable of enhancing the skin penetration of the active ingredient at least one solubilizer,
• the formulations may be either in the form of a solution gel, where the active ingredient is dissolved in the gel, or a suspension / dispersion gel, where the active ingredient is in a particulate form suspended and dispersed in the gel. It is possible, however, to produce a formulation wherein the active ingredient is present partly in a solution and partly in suspension gel form at the same time. In such formulations, the proportion of the active ingredient present in suspension (i.e. in particulate form) can be chosen freely.
• the solid particles of active ingredient are coated with one or more siloxanes and dispersed in the gel, thus obtaining a transdermal formulation having similar properties to the solution gels according to the present invention, for example, cold stability and good skin penetration, but providing additional benefits, e.g., even further enhanced stability, e.g., storage stability, especially physicochemical and microbiological stability.
• a preferred composition of the invention contains
• a more preferred composition which is a solution gel, contains
• a more preferred composition which is a suspension gel containing the active ingredient in particulate form, contains
• Purified water ad 100%.
• the amounts indicated herein may be varied for each ingredient, for example, by 20%, more preferably by 10%.
• the menthol may be exchanged for lavender oil or almond oil, for example.
• Silicone Fluid 0.65 cSt and St- Cyclomethicone 5-NF may be used, preferably both.
• the particles of active ingredient e.g., celecoxib
• a volatile siloxane coating In this coating, none of the active ingredient, the solubilizing agents, and the gel are soluble. Thus, the physical form of suspension is maintained, even though by direct contact celecoxib would dissolve in the solubilizer, and the formulation is even more stable than when the active compound would be dissolved.
• the barrier for dissolution disappears, and the active ingredient is contacted with and dissolved in the excipients, especially the solubilizers.
• Such a change in physical form of the formulation enhances absorption and skin penetration.
• This formulation thus exhibits controlled release as well as controlled absorption of the active ingredient.
• the gel containing celecoxib particles coated with siloxanes i.e., a suspension gel as opposed to the solution gel
• the temperature of the formulation would increase to, for example, between 24 to 32 °C
• the volatile siloxanes evaporate.
• the formulation becomes a solution (i.e. particles of celecoxib are solubilized, dissolved) and the solution is absorbed by the skin.
• the gel base is created from a Carbopol 980, water, and NaOH solution (Carbopol: an acrylate-type gel forming copolymer). Menthol is provided for enhancing the penetration of the active ingredient after the evaporation of the siloxanes and serves also as fragrance. Brij- 58 functions as solubilizer and PEG 1000 functions as a wetting agent. Finally the siloxane coating agents used are SF 0.65 and St-Cyclomethicone 5-NF.
• compositions can be prepared by a process that includes
• the siloxane coating agents, the selective COX-2 inhibitor compound, optionally in micronized form is dispersed in the at least one siloxane coating agent and homogenized, optionally by a colloid mill, thereby fonriing a suspension, and
• the suspension is stirred into the gel and homogenized, optionally by a colloid mill, wherein the process includes the interchanging of the at least one compound capable of enhancing the penetration of the active ingredient and the selective COX-2 inhibitor compound in the above process steps.
• the method of manufacture for the suspension formulation is as follows:
• Carbopol 980 is allowed to swell in the water and neutralized by the NaOH solution until pH 5.5-7.5, thereby forming a gel.
• Brij-58 is warmed up to approximately 40-50 °C and PEG- 1000 and menthol are dissolved in their mixture, thereby forming a melt.
• Micronized celecoxib is dispersed in the mixture of the siloxanes and homogenized, preferably by using a colloid mill.
• the method for preparation of a suspension formulation is carried out as follows. After preparing a gel by swelling the gel forming agent and addition of the precipitating agent, the solubilizer or components of solubilizer system and the wetting agent are mixed to the gel base to form a first mixture. The volatile siloxane components and menthol are mixed separately and the active ingredient, preferably celecoxib is suspended in the thus obtained mixture, forming a suspension. Finally the suspension is added to the first mixture and homogenized.
• the active ingredient is in a dissolved state in the gel, which contains the solubilizers. No particles of the active ingredient are present.
• the menthol which is used as penetration enhancer for the active ingredient, e.g., celecoxib
• the siloxanes is coated with the siloxanes.
• the active ingredient e.g. celecoxib is dissolved in the solubilizer-wetting agent mixture heated to approx. 50 °C.
• the siloxane ingredient and the penetration enhancing component, e.g. menthol are dispersed in the gel base prepared according to the method described above and homogenized, for example, using a colloidal mill.
• the solution of the active ingredient in the solubilizer-wetting agent mixture is stirred into the gel base and homogenized, e.g. using a colloidal mill.
• the menthol used as penetration enhancer is dispersed in the siloxanes, and the active compound is dissolved in the solubilizers.
• the gel forming agent is dispersed in water and allowed to swell.
• the precipitating agent is dissolved in a suitable solvent, preferably in water and the swollen gel is neutralized.
• the solubilizers Brij-58, Kolliphor P-407 and PEG- 1000 are melted together at approximately 40 °C.
• the active ingredient for example, celecoxib and if present, the penetration enhancing agent, for example, menthol are dissolved in the composite melt.
• the siloxane component is mixed into the thus obtained mass comprising the solubilizers and active ingredient and homogenized.
• the neutralized gel and the mixture of solubilizers, active ingredient and siloxane component are slowly mixed and homogenized.
• the formulations can be alternatively produced by inline manufacturing using a closed controlled manufacturing system.
• formulations of the invention can be administered by the use of a patch. However, preferably, no patch is utilized.
• the formulation of the invention preferably omit the use of higher alcohols and esters thereof, e.g., of saturated or unsaturated higher aliphatic alcohols having 8 to 22 carbon atoms.
• Evaluation of membrane permeation is measured by static Hanson-cell with closed membrane surface, acceptor phase is an aqueous buffer, where the sample is deposed on the membrane. The results are given as a cumulative amount of the active ingredient during a 6- hour testing period permeating the membrane, expressed in micrograms/square centimeters.
• the membrane used for penetration testing was a cellulosic mixed ester membrane and the acceptor phase was phosphate buffer.
• Reference preparations have been produced according to the method disclosed in WO2009007764 by coating the particles of the active ingredient with a volatile siloxane.
• a gel containing the active ingredient is solubilized form. It can be easily manufactured on an industrial scale. The membrane permeation is good, as well as the consistency and organoleptic properties.
• the active ingredient has been micronized using a Fritsch Pulvensette 14 milling equipment. There is no crystallization. The resulting composition has excellent consistency and applicability. The in vitro membrane penetration is immediate.
• Example 2 provides a suspension gel formulation of the active ingredient prepared by a process described above.
• a gel containing the active ingredient is suspended form. It can be easily manufactured on an industrial scale. The membrane permeation is immediate, the consistency and organoleptic properties are excellent.
• Comparative examples 1 and 2 are experiments with gels, which are closely tailored to the approach taken in WO2009007764 and WO2010089617.
• a classic, stable gel which can be easily manufactured. Although the gel can be easily used and is of good consistency, the skin permeation is poor.
• a classic, stable gel which can be easily manufactured. Although the gel can be easily used and of good consistency, the skin permeation is poor.
• Comparative example 3 takes the approach of enhancing the penetration of celecoxib using menthol along with various solubilizers.
• the mixture of celecoxib and menthol was found to dissolve in most solubilizers tested (comparative example 3 provides the embodiment with Tween 60), but only those having a high HLB value can maintain it in the aqueous phase. None of the solubilizers were found to be suitable for forming an emulsion alone in these experiments, since the active ingredient starts crystallizing instantly.
• a complex emulgent high+low HLB solubilizers
• an emulsion can be formed which crystallizes after a few hours. The solution is stable on the short term (24 hours) only.
• composition of comparative example 3 On the basis of the above composition of comparative example 3, further similar compositions were prepared by varying the amount of the active ingredient, from 3-6%, the amount of menthol from 1-2% and the amount of Tween 60 from 12-24%, each time using 1% Carbopol to obtain a suitable gel consistency.
• the membrane permeation increases with increasing active ingredient content but not proportionally. Increasing viscosity of the gel significantly degrades membrane permeation.

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