Patent Application
20080317737
The present invention relates to a combination of antifungal agent and an alpha hydroxy acid or a beta hydroxy acid enhances therapeutic activity and more particularly to a combination of antifungal agent and an alpha hydroxy acid or a beta hydroxy acid in a stable environment that is topically applied and is suited to formulations for use in shampoos, creams, lotions, gels, solutions/serums, sprays, pads, films. Patches, and foams for treatment of skin disorders and diseases in both humans and animals.
Fungal infections have long presented a vexing treatment issue. Fungi often resist treatment and require, sometimes, months of treatment before improvement is seen. Adding to treatment difficulties is that many topical fungal infections have associated localized hyperkeratotic lesions that adversely affect treatment secondary to poor drug penetration of the lesions as a result of the physical and cellular properties of the hyperkeratotic lesion. Accordingly, removal of thick infected keratin (hyperkeratosis) is useful in creating an environment in which the topical drug can more readily penetrate the fungal lesion. Historically, therefore, hyperkeratotic lesions have been excised prior to treating the underlying infection.
Attempts to address the problem via a single pharmacologic compound have, until now, been limited by the fact that effective agents for treating the hyperkeratotic lesion and the fungal infection have chemical and/or physical properties that render them instable in the presence of one another. Attempts to address the combination drug problem have generally required that the antifungal agent is combined with either a coating agent or a carrying agent.
The present invention advances the art through combining an antifungal agent with an alpha hydroxy acid or a beta hydroxy acid. This unique combination enables the skin and the cell membrane of fungi to be easily and effectively penetrated due to the acid's keratolytic properties while the antifungal agent remains unbound. This, in turn, enables a greater amount of bio-available antifungal agent to reach the infection.
The present invention is unique in that it advances the art by permitting the use of an antifungal agent and an alpha hydroxy acid or a beta hydroxy acid agent in the presence of surfactants to create a formula that penetrates easily and is suitable for use in shampoos, creams, lotions, gels, solutions/serums, films, patches, sprays, pads, and foams.
It is an object of the present invention to create a stable drug combination that combines a hydroxy acid with an antifungal agent.
It is further an object of the present invention to create a stable drug combination that effectively treats fungal infections and is also useful for other disorders such as yeast infections.
It is further an object of the present invention to create a drug combination in which the hydroxy acid is a beta hydroxy acid or an alpha hydroxy acid.
It is further an object of the present invention to create such a drug combination that remains stable and is suitable for use as a topical treatment of both human and animal fungal infections and fungal based diseases.
It is further an object of the present invention to create such a drug combination that is flexible enough that it can be used in multiple formulation such as shampoos, creams, lotions, gels, solutions/serums, films, patches sprays, and foams.
It is further an object of the present invention to create a drug combination that has optimum pH properties and thus low potential of irritation.
The advantages offered by the present invention include but are not limited to effectively treating skin diseases and disorders in humans and animals through the use of a heretofore unknown stable drug combination which eases penetration of hyperkeratotic lesions associated with fungal infections while leaving the antifungal agent unbound. A further advantage of the present invention is that it is effective in treating other infections as well, such as yeast infections. A further advantage of the present invention is increasing efficacy while easing treatment protocols and procedures. A further advantage of the present invention is to decreases the potential for skin irritation and inflammation.
The present invention comprises a stable drug combination having at least one antifungal agent and at least one beta hydroxy acid compound or at least one alpha hydroxy acid compound or combination thereof, both in active form for treatment of skin disorders and diseases in both humans and animals. The invention is formulated for topical applications, such as shampoos, creams, lotions, gels, solutions/serums, films, patches, sprays, and foams. The concentration range for the antifungal agent is 0.05% to 10%, and the concentration range for the hydroxy acid agent is 2% to 10%. In the preferred embodiment, the antifungal agent is ciclopirox at a concentration of 0.05% to 3% and the beta hydroxy acid agent is salicylic acid at a concentration of 2% to 6%. The combination can be further combined with surfactants, emulsifiers, solvents, and the like to produce a stable topical dosage form.
There has been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and that will form the subject matter of the invention.
Before explaining the preferred embodiment of the present invention in detail, it is to be understood that the present invention is not limited in its application to the details of formulations and arrangements of the components set forth in the following description. The present invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. It is also to be understood that where ranges are provided for the various agents and drug examples, they are approximate ranges and are not to be limiting except where noted otherwise.
The present invention contemplates a combination of two different types and classes of drug into topical dosage forms for the treatment of human and animal skin disorders and diseases. According to the invention, an antifungal agent and a hydroxy acid are combined to create a stable compound effective for the treatment of topical fungal infections, especially those associated with hyperkeratotic lesions as well as other infections such as yeast infections.
Antifungal agents comprise a broad range of therapeutic agents. Non-limiting examples of Synthetic Antifungal Agents are used both topically and systemically include: Pyridone and its derivatives (e.g. Ciclopirox and Ciclopirox Olamine); Azole antifungals, including Imidazoles and its derivatives (e.g. clotrimazole, miconazole, ketoconazole, econazole, terconazole, tioconazole, sertaconazole, butoconazole, oxiconazole, sulconazole, metronidazole, and posoconazole) and Triazoles and its derivatives (e.g. terconazole, itraconazole, fluconazole, etc.); Allylamines and its derivatives (e.g. Terbinafine, neftifine, butenafine, etc.); Tetraene Macrolide (e.g. Nystatin); Polyene Macrolide (e.g. Amphotericin B); Halogenated Phenolic Ether (e.g. Haloprogin); and, Benzoxaborole and its derivatives. The penicillum spp. based antifungal Griseofulvin is also an important and suitable antifungal for use in the invention.
Alpha hydroxy acids and beta hydroxy acids are useful in several skin diseases and disorders and many have hyperkeratolic properties as well. Non-limiting examples of Alpha Hydroxy acids useful in the treatment of skin disorders include lactic acid, mandelic acid, citric acid, glycolic acid, glucuronic acid, and pyruvic acid. Non-limiting examples of beta hydroxy acids useful in the treatment of skin disorders include salicylic acid, Papain, Chymopapain, and Urea.
In each case, the combination includes beta hydroxy acid, when used in a range of about 2% to about 10%, alpha hydroxy acid, when used in a range of about 5% to about 15% and antifungal agent in the range in about 0.05% to about 10%. It should be noted that beta hydroxy acid and alpha hydroxy acid can be used alone or in conjunction or combination with one another. Additionally, more than one antifungal may be used.
In the preferred embodiment, Ciclopirox and salicylic acid are agents of choice. While having different chemical and physical properties from one another, they contain structures that, using the inventive formula and combining process, enable their combination in a stable and effective compound. Though Ciclopirox and salicylic acid are used in the preferred embodiment, this is in no way to be considered limiting in considering the scope of the inventions and the appended claims. Other combinations of antifungals and hydroxy acid agents may also be used in a similar fashion.
Once the antifungal and hydroxy acid are combined according to the description above, they can be further combined with additional components, depending on the intended final use of the product. In a typical formulation, in addition to the antifungal and hydroxy acid combination, any or all of the following may be added without negatively impacting the drugs:
Suitable surfactants can be found in almost any class, including anionic, amphoteric, cationic, non-ionic surfactants. Anionic surfactants have excellent foaming properties, moderate to low irritation potential, and good viscosity building ability. Anionic surfactants include the alkylsulfates, alkylether sulfates, sulfonates, taurates, sulfosuccinates, sacosinates, glutamates, and isothionates.
Anionic synthetic detergents include water-soluble salts, particularly the alkali metal salts, of organic sulfuric reaction products having in their molecular structure an alkyl group containing from about 8 to about 22 carbon atoms and a moiety selected from the group comprising of sulfonic acid and sulfuric acid ester moieties. (Included in the term alkyl is the alkyl portion of higher acyl moieties.) Examples of this group of synthetic detergents are the sodium and potassium alkyl sulfates, especially those obtained by sulfating the higher alcohols (C.sub.8 -C.sub.18 carbon atoms) produced by reducing the glycerides of tallow or coconut oil; sodium and potassium alkyl benzene sulfonates, in which the alkyl group contains from about 9 to about 20 carbon atoms in straight-chain or branched-chain configuration; sodium alkyl glyceryl ether sulfonates, especially those ethers of higher alcohols derived from tallow and coconut oil; sodium coconut oil fatty acid monoglyceride sulfonates and sulfates.
Anionic phosphate surfactants are surface active materials having substantial detergent capability in which the anionic solubilizing group connecting hydrophobic moieties is an oxy acid of phosphorus. The more common solubilizing groups, of course, are —SO.sub.4 H and —SO.sub.3 H. Alkyl phosphate esters such as (R—O).sub.2 PO.sub.2 H and ROPO.sub.3 H.sub.2 in which R represents an alkyl chain containing from about 8 to about 20 carbon atoms are useful herein.
These phosphate esters can be modified by including in the molecule from one to about 40 alkylene oxide units, e.g., ethylene oxide units. Formulae for these modified phosphate anionic detergents are ##EQU24## or ##EQU25## in which R represents an alkyl group containing from about 8 to 20 carbon atoms, or an alkylphenyl group in which the alkyl group contains from about 8 to 20 carbon atoms, and M represents a soluble cation such as hydrogen, sodium, potassium, ammonium or substituted ammonium; and in which n is an integer from 1 to about 40.
Another class of suitable anionic organic detergents includes salts of 2-acyloxyalkane-1-sulfonic acids exemplified by the reaction product of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide where, for example, the fatty acids are derived from coconut oil. These salts have the formula ##EQU26## where R.sub. 1 is alkyl of about 9 to about 23 carbon atoms (forming with the two carbon atoms an alkane group); R.sub.2 is alkyl of 1 to about 8 carbon atoms; and M is a water-soluble cation.
The water-soluble cation, M, can be, for example, an alkali metal cation (e.g., sodium, potassium, lithium), ammonium or substituted-ammonium cation. Specific examples of substituted ammonium cations include methyl-, dimethyl-, and trimethyl-ammonium cations and quaternary ammonium cations such as tetramethyl-ammonium and dimethyl piperidinium cations and those derived from alkylamines such as ethylamine, diethylamine, triethylamine, mixtures thereof, and the like.
Specific examples of beta-acyloxy-alkane-1-sulfonates, or alternatively 2-acyloxy-alkane-1-sulfonates, useful herein include the sodium salt of 2-acetoxy-tridecane-1-sulfonic acid; the potassium salt of 2-propionyloxy-tetradecane-1-sulfonic acid; the lithium salt of 2-butanoyloxy-tetradecane-1-sulfonic acid; the sodium salt of 2-pentanoyloxy-pentadecane-1-sulfonic acid; the sodium salt of 2-acetoxy-hexadecane-1-sulfonic acid; the potassium salt of 2-octanoyloxy-tetradecane-1-sulfonic acid; the sodium salt of 2-acetoxy-heptadecane-1-sulfonic acid; the lithium salt of 2-acetoxy-octadecane-1-sulfonic acid; the potassium salt of 2-acetoxy-nonadecane-1-sulfonic acid; the sodium salt of 2-acetoxy-uncosane-1-sulfonic acid; the sodium salt of 2-propionyloxy-docosane-1-sulfonic acid; the isomers thereof.
Useful beta-acyloxy-alkane-1-sulfonate salts are the alkali metal salts of beta-acetoxy-alkane-1-sulfonic acids corresponding to the above formula wherein R.sub.1 is an alkyl of about 12 to about 16 carbon atoms, these salts being preferred from the standpoints of their excellent cleaning properties and ready availability.
Another preferred class of anionic detergent compounds herein, both by virtue of superior cleaning properties and low sensitivity to water hardness (Ca++ and Mg++ ions) are the alkylated .alpha.-sulfocarboxylates, containing about 10 to about 23 carbon atoms, and having the formula: ##EQU27## wherein R is C.sub.8 to C.sub.20 alkyl, M is a water-soluble cation as hereinbefore disclosed, preferably sodium ion, and R′ is either short chain length alkyl, e.g., methyl, ethyl, propyl, and butyl or medium chain length alkyl, e.g., hexyl, heptyl, octyl, and nonyl. In the latter case, i.e. the medium chain length esters, the total number of carbon atoms should ideally be in the range 18-20 for optimum performance. These compounds are prepared by the esterification of alpha.-sulfonated carboxylic acids, which are commercially available, using standard techniques. Specific examples of the alkylated .alpha.-sulfocarboxylates preferred for use herein include, short chain length esters (ammonium methyl-.alpha.-sulfopalmitate, triethanolammonium ethyl-.alpha.-sulfostearate, sodium methyl-.alpha.-sulfopalmitate, sodium ethyl-.alpha.-sulfopalmitate, sodium butyl-.alpha.-sulfostearate, potassium methyl-.alpha.-sulfolaurate, and lithium methyl-.alpha.-sulfolaurate, including mixtures); and, medium chain length esters (sodium hexyl-.alpha.-sulphomyristate, potassium octyl-.alpha.-sulpholaurate, ammonium methyl-hexyl-.alpha.-sulpholaurate, and mixtures thereof).
Anionic organic detergents the beta.-alkyloxy alkane sulfonates group are also useful. These compounds have the following formula: ##EQU28## where R.sub.1 is a straight chain alkyl group having from 6 to 20 carbon atoms, R.sub.2 is a lower alkyl group having from 1 (preferred) to 3 carbon atoms, and M is a water-soluble cation as hereinbefore described. Non-limiting examples of beta.-alkyloxy alkane sulfonates, or alternatively 2-alkyloxy-alkane-1-sulfonates, having low hardness (calcium ion) sensitivity useful herein to provide superior cleaning levels under household washing conditions include, potassium-.beta.-methoxydecanesulfonate, sodium 2-methoxytridecanesulfonate, potassium 2-ethoxytetradecylsulfonate, sodium 2-isopropoxyhexadecylsulfonate, lithium 2-t-butoxytetradecylsulfonate, sodium .beta.-methoxyoctadecylsulfonate, and ammonium .beta.-n-propoxydodecylsulfonate.
Another suitable class of anionic surfactants is the water-soluble salts of the organic, sulfuric acid reaction products of the general formula wherein R.sub.1 is chosen from the group comprising of a straight or branched chain, saturated aliphatic hydrocarbon radical having from 8 to 24, preferably 12 to 18, carbon atoms; and M is a cation. Examples are the salts of an organic sulfuric acid reaction product of a hydrocarbon of the methane series, including iso-, neo-, meso- and n-paraffins, having 8 to 24 carbon atoms, preferably 12 to 18 carbon atoms and a sulfonating agent e.g. SO.sub.3, H.sub.2 SO.sub.4, oleum, obtained according to known sulfonation methods, including bleaching and hydrolysis. Preferred are alkali metal and ammonium sulfonated C.sub.12-18 n-paraffins.
Other useful synthetic anionic detergents are alkyl ether sulfates. These surfactants have the formula RO(C.sub.2 H.sub.4 O).sub.x SO.sub.3 M wherein R is alkyl or alkenyl of about 10 to about 20 carbon atoms, x is 1 to 30, and M is a water-soluble cation as defined hereinbefore. The alkyl ether sulfates useful in the present invention are condensation products of ethylene oxide and monohydric alcohols having about 10 to about 20 carbon atoms. Preferably, R has 14 to 18 carbon atoms. The alcohols can be derived from fats, e.g., coconut oil or tallow, or can be synthetic. Lauryl alcohol and straight chain alcohols derived from tallow are preferred herein. Such alcohols are reacted with 1 to 30, and especially 6, molar proportions of ethylene oxide and the resulting mixture of molecular species, having, for example, an average of 6 moles of ethylene oxide per mole of alcohol, is sulfated and neutralized.
Examples of alkyl ether sulfates of the present invention are sodium coconut alkyl triethylene glycol ether sulfate; lithium tallow alkyl triethylene glycol ether sulfate; and sodium tallow alky hexaoxyethylene sulfate. Especially useful alkyl ether sulphates are those comprising a mixture of individual compounds, said mixture having an average alkyl chain length of from about 12 to 16 carbon atoms and an average degree of ethoxylation of from about 1 to 4 moles of ethylene oxide. Such a mixture also comprises from about 0 to 20% by weight C.sub.12-13 compounds; from 60 to 100% by weight of C.sub.14-15-16 compounds; from about 0 to 20% by weight of C.sub.17-18-19 compounds; from about 3 to 30% by weight of compounds having a degree of ethoxylation of 0; from about 45 to 90% by weight of compounds having a degree of ethoxylation of from 1 to 4; from about 10 to 25% by weight of compounds having a degree of ethoxylation of from 4 to 8; and from about 0.1 to 15% by weight of compounds having a degree of ethoxylation greater than 8.
Additional examples of useful anionic synthetic detergents are those resulting from the reaction product of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide where, for example, the fatty acids are derived from coconut oil; sodium or potassium salts of fatty acid amides of methyl tauride in which the fatty acids, for example, are derived from coconut oil.
Di-anionic detergents compounds, those surfactants containing two anionic functional groups and including the disulfonates, disulfates, or mixtures thereof, where R is an acyclic aliphatic hydrocarbyl group having 15 to 20 carbon atoms and M is a water-solubilizing cation, for example, the C.sub.15 to C.sub.20 disodium 1,2-alkyldisulfates, C.sub.15 to C.sub.20 dipotassium-1,2-alkyldisulfonates or disulfates, disodium 1,9-hexadecyl disulfates, C. sub.15 to C.sub.20 disodium-1,2-alkyldisulfonates, disodium 1,9-stearyldisulfates and 6,10-octadecyldisulfates. The aliphatic portion of the disulfates or disulfonates is generally substantially linear, thereby imparting desirable biodegradable properties to the detergent compound. Water-solubilizing cations include the customary cations known in the detergent art, i.e., the alkali metals, and the ammonium cations, as well as other metals in group IIA, IIB, IIIA, IVA and IVB of the Periodic Table except for boron. Preferred water-solubilizing cations are sodium or potassium.
Still other anionic synthetic detergents include the class designated as succinamates. This class includes such surface active agents as disodium N-octadecylsulfosuccinamate; tetrasodium N-(1,2-dicarboxyethyl)-N-octadecylsulfo-succinamate; diamyl ester of sodium sulfosuccinic acid; dihexyl ester of sodium sulfosuccinic acid; dioctyl esters of sodium sulfosuccinic acid.
Other suitable anionic detergents are olefin sulfonates having about 12 to about 24 carbon atoms. The term “olefin sulfonates” is used herein to mean compounds which can be produced by the sulfonation of alpha-olefins by means of uncomplexed sulfur trioxide, followed by neutralization of the acid reaction mixture in conditions such that any sultones which have been formed in the reaction are hydrolyzed to give the corresponding hydroxy-alkanesulfonates. The sulfur trioxide can be liquid or gaseous, and is usually, but not necessarily, diluted by inert diluents, for example by liquid SO.sub.2, chlorinated hydrocarbons, etc., when used in the liquid form, or by air, nitrogen, gaseous SO.sub.2, etc., when used in the gaseous form. When used in the invention, Anionic surfactants should be in a concentration range of about 3% to about 30%.
Amphoteric surfactants are very mild, making them particularly suited for use in personal care and household cleaning products. These surfactants have excellent dermatological properties. They are frequently used in shampoos and other cosmetic products, and also in hand dishwashing liquids because of their high foaming properties. Amphoteric surfactants can be anionic (negatively charged), cationic (positively charged) or non-ionic (no charge) in solution, depending on the acidity or pH of the water. They are compatible with all other classes of surfactants and are soluble and effective in the presence of high concentrations of electrolytes, acids and alkalis. These surfactants may contain two charged groups of different sign. Whereas the positive charge is almost always ammonium, the source of the negative charge may vary (carboxylate, sulphate, sulphonate) and include ordinary alkali metal soaps (e.g. sodium, potassium, ammonium and alkylolamminium salts of higher fatty acids containing from about eight to about 24 carbon atoms and preferably from about 10 to about 20 carbon atoms). Suitable fatty acids can be obtained from natural sources such as, for instance, from plant or animal esters (e.g., palm oil, coconut oil, babassu oil, soybean oil, caster oil, tallow, whale and fish oils, grease, lard, and mixtures thereof). The fatty acids also can be synthetically prepared (e.g., by the oxidation of petroleum, or by hydrogenation of carbon monoxide by the Fischer-Tropsch process). Resin acids are suitable such as rosin and those resin acids in tall oil. Napthenic acids are also suitable. Sodium and potassium soaps can be made by direct saponification of the fats and oils or by the neutralization of the free fatty acids which are prepared in a separate manufacturing process. Particularly useful are the sodium and potassium salts of the mixtures of fatty acids derived from coconut oil and tallow, i.e., sodium or potassium tallow and coconut soap. Betaines are classified generally as amphoteric surfactants. (e.g. cocamidopropyl betaine, sodium cocoamphoacetate)
When used in the invention, amphoteric surfactants should be in a concentration range of about 2% to about 15%.
Cationic Surfactants are quatermary ammonium compounds that acts as a hair conditioners. Examples include cetyltrimethyl ammonium chloride, strearyl dimethyl benzyl ammonium chloride and polyquaterniums. When used in the invention, cationic Surfactants should be in a concentration range of about 0.01% to about 5%.
Nonionic Surfactants are modified linear alcohol ethoxylated compounds and, for example, include glycol fatty esters, sorbitans, tweens, and fatty acid derivatives. When used in the invention, nonionic Surfactants should be in a concentration range of about 2% to about 20%.
In addition to surfactants, viscosity adjusting agents may be added. These agents are used specifically to increase viscosity of product. Polymeric and non-polymeric materials are useful. Examples include acrylate polymers, natural gums-acacia, tregacanth, pectin, etc. When used in the invention, they should be in a concentration range of about 0.1% to about 16%.
pH-adjusters are organic and inorganic acids and bases employed to adjust pH of products to improve physical and chemical stability. Examples include citric acid, lactic acid, sodium hydroxide, ethanolamines, hydrochloric acid, etc. When used in the invention, pH-adjusters would be expected to be in a concentration range of about 0.5% to about 10%, although the final concentration will be in an amount as is necessary for the particular product produced under the invention, and may be outside of this range.
Stabilizers include chelating and anti-oxidant agents such as disodium EDTA, BHT, and BHA, among others. When used in the invention, they should be in a concentration range of about 0.01% to about 2%.
Preservatives serve to preserve products microbiologically during shelf-life of product. Examples include parabens, sorbic acid, germalls, potassium sorbate, and sodium benzoate. When used in the invention, they should be in a concentration range of about 0. 1% to about 3%.
Moisturizers, or humectants, may be added to certain formulations. Examples include glycerin, sorbitol, and sodium PCA. When used in the invention, they should be in a concentration range of about 0.5% to about 5%.
Fragrance and/or color may be added if desired. If included, they should be in a concentration range of about 0.01% to about 2%.
Finally, a vehicle is used. Normally this will be water in a range of about 25% to 65%.
It is to be understood that the above discussion represents non-limiting explanations and examples of suitable components. As those skilled in the arts will quickly understand, there are myriad other components, by category or type, that may be used within the scope and spirit of the invention.
An example of the invention is seen below where the inventive formulation is used in a shampoo. The base for each example below contains one or more of the following comprises:
As can be seen, this shampoo example composition includes salicylic acid 6% and ciclopirox 1%.
Here a shampoo composition comprising salicylic acid at 6% and ketoconazole 2%.
Here a solution comprising salicylic acid 6% and Ketoconazole 2%
Here a cream comprising ciclopiroxolamine 1%
Here a cream comprising ciclopiroxolamine 1% and salicylic acid 6%
Here a cream comprising econazole nitrate 2% and salicylic acid 6%
Here a cream comprising ketoconazole 2% and lactic acid 12.0%
Here a foaming lotion comprising ciclopiroxolamine 1% and salicylic acid 6%
The above examples are for illustrative purpose only. They are intended to provide examples of the versatility of the inventive combinations and should not be considered limiting. Additional combinations for use in cream, lotion, gel, solution/serum, films, patches, foam, spray, and pad dosage forms is also contemplated using the disclosed formulation and preparation standards.
For cream, lotion, gel, solution, foam, spray, film, patches, and pads, the concentration range for the hydroxy acid and antifungal will be:
The efficacy of the inventive formula is demonstrated by the following laboratory studies. In study number one, four preparations made having a base corresponding to the shampoo formula listed above (all ingredients with the exception of an antifungal and a hydroxy acid) were produced. The first preparation included Ciclopirox 1% but no hydroxy acid (Preparation 1). The second preparation included Salicylic acid 6% but. no antifungal agent (Preparation 2). The third preparation included no active ingredients (Preparation 3). The fourth preparation included Ciclopirox 1% and Salicylic acid 6 % (Preparation 4). Each of the preparations was exposed to T. mentagrophytes, var.1 and T. mentagrophytes, var.2 for one, three, and five minutes. Inoculum level for Var.1 was 1×105 and for Var.2 was 3.51×105. The results are presented below.
T. mentagrophytes, var. 1
T. mentagrophytes, var. 2
T. mentagrophytes, var. 1
T. mentagrophytes, var. 2
T. mentagrophytes, var. 1
T. mentagrophytes, var. 2
T. mentagrophytes, var. 2
T. mentagrophytes, var. 1
As expected, Preparation 3, no actives, had very little effect on fugal kill rates. Not unexpectedly, Preparation 2, Salicylic acid 6%, no antifungal agent, very little effect, and Preparation 1, Ciclopirox 1%, no hydroxy acid, had some effect on the kill rate, with Preparation 1 (containing an antifungal having significantly higher kill rates than either Preparations 2 or 3. However, Preparation 4, containing the inventive formula Ciclopirox 1% and Salicylic acid 6% had over twice the log reduction kill rate as Preparation 1 which contained only the antifungal agent. Preparation 4 showed no growth for var.1 and 2 at 1, 3, and 5 minutes with 5 log reduction. Preparations 1, 2 and 3 showed growth with lower log reduction.
In study number two, three preparations made having a base corresponding to the cream formula listed above (all ingredients with the exception of an antifungal and a hydroxy acid) were produced. The first preparation included no active ingredients (Preparation 1). The second preparation included Ciclopirox Olamine 1% but no hydroxy acid (Preparation 2). The third preparation included Ciclopirox 1% and Salicylic acid 6% (Preparation 3). Each of the preparations was exposed to C. albicans for five, fifteen, thirty minutes. Inoculum level was 9.75×105. The results are presented below.
C. Albicans
C. Albicans
C. Albicans
As expected, Preparation 1, no actives, had very little effect on fugal kill rates. Not unexpectedly, Preparation 2, antifungal agent but no hydroxy acid had some effect on the kill rate. However, Preparation 4, containing the inventive formula Ciclopirox 1% and Salicylic acid 6% had over twice the log reduction kill rate as Preparation 2. Preparation 3 showed no growth at 5, 15, and 30 minutes with 5.99 log reduction. Preparations 1 and 2 showed growth with lower log reduction.
It is to be understood, however, that even though numerous characteristics and advantages of the preferred and alternative embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
This application claims the priority of provisional application No. 60/944873 filed Jun. 19, 2007.
| Number | Date | Country | |
|---|---|---|---|
| 60944873 | Jun 2007 | US |
