Topical pharmaceutical formulations containing a low concentration of benzoyl peroxide in suspension in water and a water-miscible organic solvent
Abstract
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38 claims: 3 independent, 35 dependent
- 1界面活性剤を含まない、皮膚に局所塗布する水溶性ゲル製剤であって、水と、プロピレングリコールと、カルボマーゲル化剤と、過酸化ベンゾイルとを有し、前記水溶性ゲル製剤は、過酸化ベンゾイルの飽和溶液および過酸化ベンゾイル懸濁物を含むものであり、 前記プロピレングリコールの濃度は、前記製剤中に界面活性剤を含めることなく前記水溶性ゲル製剤中において安定な過酸化ベンゾイル懸濁物を与えるのに十分な濃度であり、 前記製剤中の水とプロピレングリコールの濃度の比率は、皮膚に塗布後の製剤中の前記過酸化ベンゾイルを飽和溶解度に保つのに十分な比率であって、前記製剤中の過酸化ベンゾイルの濃度は、2.0%から3.5%w/wの濃度である、 ことを特徴とする水溶性ゲル製剤。
- 2請求項1記載の水溶性ゲル製剤であって、過酸化ベンゾイルの濃度は2.5%w/wである、水溶性ゲル製剤。
- 3請求項1記載の水溶性ゲル製剤であって、前記プロピレングリコールの濃度は、前記製剤から全ての水を除去した後の製剤中に全ての前記過酸化ベンゾイルが溶解するときのプロピレングリコールの濃度よりも低いものである、水溶性ゲル製剤。
- 4請求項1記載の水溶性ゲル製剤であって、前記プロピレングリコールの濃度は、前記製剤中における前記過酸化ベンゾイルの濃度の1から4倍である、水溶性ゲル製剤。
- 5請求項1記載の水溶性ゲル製剤であって、前記製剤中の水のプロピレングリコールに対する比率(w/w)は少なくとも7:1である、水溶性ゲル製剤。
- 6請求項5記載の水溶性ゲル製剤であって、前記比率は少なくとも10:1である、水溶性ゲル製剤。
- 7請求項6記載の水溶性ゲル製剤であって、前記比率は少なくとも20:1である、水溶性ゲル製剤。
- 8請求項1記載の水溶性ゲル製剤であって、当該水溶性ゲル製剤は、2.5%w/wの過酸化ベンゾイルを有するものであり、 前記プロピレングリコールの濃度は前記過酸化ベンゾイルの濃度の1から4倍であり、および前記水とプロピレングリコールの濃度の比率は、少なくとも12:1である、 水溶性ゲル製剤。
- 9請求項8記載の水溶性ゲル製剤であって、当該水溶性ゲル製剤は、さらに、1.2%w/wのリン酸クリンダマイシンを含むものである、水溶性ゲル製剤。
- 10請求項1記載の水溶性ゲル製剤であって、この水溶性ゲル製剤は、さらに、過酸化ベンゾイルに加えて、ニキビの治療に有効な化合物を有するものである、水溶性ゲル製剤。
- 11請求項10記載の水溶性ゲル製剤であって、前記化合物は水に溶けるものである、水溶性ゲル製剤。
- 12請求項10記載の水溶性ゲル製剤であって、前記化合物は抗生物質である、水溶性ゲル製剤。
- 13請求項12記載の水溶性ゲル製剤であって、前記抗生物質は、マクロライド系若しくはリンコマイシン系の抗生物質である、水溶性ゲル製剤。
- 14請求項13記載の水溶性ゲル製剤であって、前記抗生物質はクリンダマイシンである、水溶性ゲル製剤。
- 15界面活性剤を含まない、皮膚に局所塗布する水溶性ゲル製剤を調製する方法であって、水と、プロピレングリコールと、カルボマーゲル化剤と、過酸化ベンゾイルとを混合する工程を有し、 混合物中の前記プロピレングリコールの混合濃度は、前記製剤中に界面活性剤を含めることなく前記水溶性ゲル製剤において安定した過酸化ベンゾイル懸濁物を与えるのに十分な濃度であり、 前記製剤中に混合される水とプロピレングリコールの濃度の比率は、皮膚に塗布後の製剤中の前記過酸化ベンゾイルを飽和溶解度に保つのに十分な比率であり、前記水溶性ゲル製剤は、過酸化ベンゾイルの飽和溶液および過酸化ベンゾイル懸濁物を含むものであり、前記製剤中に混合される過酸化ベンゾイルの濃度は、2.0%から3.5%w/wの濃度であることを特徴とする、方法。
- 16請求項15記載の方法であって、過酸化ベンゾイルの濃度は2.5%w/wである、方法。
- 17請求項15記載の方法であって、前記プロピレングリコールの混合濃度は、前記製剤から全ての水を除去した後の製剤中に全ての前記過酸化ベンゾイルが溶解するときの有機溶剤の濃度よりも低いものである、方法。
- 18請求項15記載の方法であって、前記プロピレングリコールの混合濃度は、前記製剤中に混合される前記過酸化ベンゾイルの濃度の1から4倍である、方法。
- 19請求項15記載の方法であって、前記製剤中に混合された水に対するプロピレングリコールの比率(w/w)は少なくとも7:1である、方法。
- 20請求項19記載の方法であって、前記比率は少なくとも10:1である、方法。
- 21請求項20記載の方法であって、前記比率は少なくとも20:1である、方法。
- 22請求項15記載の方法であって、この方法は、さらに、過酸化ベンゾイルに加えて、ニキビの治療に有効な化合物を有するものである、方法。
- 23請求項22記載の方法であって、前記化合物は水に溶けるものである、方法。
- 24請求項22記載の方法であって、前記化合物は抗生物質である、方法。
- 25請求項24記載の方法であって、前記抗生物質は、マクロライド系若しくはリンコマイシン系の抗生物質である、方法。
- 26請求項25記載の方法であって、前記抗生物質はクリンダマイシンである、方法。
- 27界面活性剤を含まない、ニキビ治療用の皮膚への局所塗布用水溶性ゲル製剤を製造するための、水と、プロピレングリコールと、カルボマーゲル化剤と、過酸化ベンゾイルの使用であって、 前記皮膚への局所塗布用水溶性ゲル製剤は、水と、プロピレングリコールと、過酸化ベンゾイルとを有するものであり、前記水溶性ゲル製剤は、過酸化ベンゾイルの飽和溶液および過酸化ベンゾイル懸濁物を含むものであり、 前記プロピレングリコールの濃度は、前記製剤中に界面活性剤を含めることなく前記水溶性ゲル製剤に安定した過酸化ベンゾイル懸濁物を提供するのに十分な濃度であり、 前記製剤中の水とプロピレングリコールの濃度の比率は、皮膚に塗布後の製剤中の前記過酸化ベンゾイルを飽和溶解度に保つのに十分な比率であって、前記製剤中の過酸化ベンゾイルの濃度は、2.0%から3.5%w/wの濃度であることを特徴とするものである、使用。
- 28請求項27記載の使用であって、過酸化ベンゾイルの濃度は約2.5%w/wである、使用。
- 29請求項27記載の使用であって、前記プロピレングリコールの濃度は、前記製剤から全ての水を除去した後の製剤中に全ての前記過酸化ベンゾイルが溶解するときのプロピレングリコールの濃度よりも低いものである、使用。
- 30請求項27記載の使用であって、前記プロピレングリコールの濃度は、前記製剤中の前記過酸化ベンゾイルの濃度の1から4倍である、使用。
- 31請求項27記載の使用であって、前記製剤中の水に対するプロピレングリコールの比率(w/w)は少なくとも7:1である、使用。
- 32請求項31記載の使用であって、前記比率は少なくとも10:1である、使用。
- 33請求項32記載の使用であって、前記比率は少なくとも20:1である、使用。
- 34請求項15記載の方法であって、前記製剤は過酸化ベンゾイルに加えてニキビの治療に有効な化合物をさらに有するものである、方法。
- 35請求項34記載の方法であって、前記化合物は水に溶けるものである、方法。
- 36請求項34記載の方法であって、前記化合物は抗生物質である、方法。
- 37請求項36記載の方法であって、前記抗生物質は、マクロライド系若しくはリンコマイシン系の抗生物質である、方法。
- 38請求項37記載の方法であって、前記抗生物質はクリンダマイシンである、方法。
Independent claims38
39 paragraphs, as filed
The present invention relates to a pharmaceutical preparation to be locally applied for the purpose of treating a skin disease. In particular, the present invention relates to a preparation containing benzoyl peroxide and optionally an anti-acne compound such as an antibiotic.
Benzoyl peroxide is widely used in topical pharmaceutical formulations for the treatment of skin diseases such as acne vulgaris, commonly referred to as acne. In addition, antibiotics for topical application are also used in topical preparations for the treatment of skin diseases such as acne. Examples of antibiotics used topically for the treatment of acne include macrolide antibiotics such as erythromycin and lincomycin antibiotics such as clindamycin and lincomycin.
Concomitant products containing benzoyl peroxide and antibiotics have been used in the past and provide higher acne-suppressing efficacy than formulations containing either benzoyl peroxide or antibiotics alone. Klein's US Pat. No. 4,497,794 discloses a combination formulation containing benzoyl peroxide and erythromycin for the treatment of acne. The composition generally formulated as described in Klein's '794 is commercially available under the trade name Benzamycin® (Dermic Laboratories, Berwyn, PA). The combination of benzoyl peroxide and lincomycin antibiotics (eg, clindamycin) is Klein's US Pat. No. 5,767,098, Barody's US Pat. No. 5,733,866, and Steiffel. (Stiepel) is disclosed in US Pat. No. 5,466,446. The composition generally formulated as described in Klein's '09 8 was generally formulated under the trade name Benzaclin® (Dermic Laboratories) and as described in Steiffel. The composition is commercially available under the trade name Duac® (Stiffel Laboratories, Coral Gables, Florida).
One of the problems associated with topical treatment of compositions containing benzoyl peroxide, alone or in combination with antibiotics, is local irritation to the area to be applied. Benzoyl peroxide has been shown to cause concentration-dependent irritation. See Mills et al, International Journal of Dermatology, 25 (10): 664-667 (1986), and Lassus, Current Medical Research and Opinion, 7 (6): 370-373 (1981). Each of the above products contains benzoyl peroxide at a concentration of 5% w / w, which concentration is associated with irritation.
Benzoyl peroxide is substantially insoluble in water. The irritation caused by the application of a composition containing benzoyl peroxide has been identified as being caused by the suspended portion of benzoyl peroxide. On the other hand, dissolved benzoyl peroxide causes little or no skin irritation. See U.S. Pat. No. 7,153,888 by Schwarz and U.S. Pat. No. 4,923,900 by DeVillez. Schwartz discloses a composition comprising benzoyl peroxide, in which all of the benzoyl peroxide in the composition is dissolved in an organic solvent. Since dissolution of benzoyl peroxide accelerates the deterioration of benzoyl peroxide, Schwartz discloses that the inclusion of antioxidants in the composition improves the stability of the solution.
One drawback of Schwartz is that it requires a high concentration of organic solvent to dissolve benzoyl peroxide. High concentrations of organic solvents tend to irritate the skin, especially due to the drying action of solubilizing skin lipids. Schwartz discloses multiple examples of compositions containing various organic solvents and benzoyl peroxide in Tables 1-3. The concentration of the organic solvent in each of the examples exceeds 10 times the concentration of the benzoyl peroxide in the composition, and usually exceeds 15 times.
Devilles discloses a composition comprising benzoyl peroxide, water, and a water-miscible organic solvent that is less volatile than water and dissolves the benzoyl peroxide. There is. Prior to application to the skin, the benzoyl peroxide is suspended in the composition. However, when applied to the skin, the water in the composition evaporates relatively quickly compared to the organic solvent. The benzoyl peroxide of the composition is then dissolved in situ in the organic solvent, resulting in a solution of benzoyl peroxide after all the water has evaporated. In order for the Devil's composition to change from suspension to solution, the composition remains intact on the surface of the skin for a time sufficient for the water in the composition to evaporate. Must be. During that time, the benzoyl peroxide is suspended in the composition and the suspended particles can come into contact with the skin and cause irritation. In addition, Devilles, like Schwartz, requires relatively high concentrations of organic solvents, thus increasing the likelihood of irritation with such compositions. Prior art document information related to the invention of this application includes the following (including documents cited at the international stage after the international filing date and documents cited when domestically transferred to another country).
[Prior Art Document]
[Patent Document]
[Patent Document 1] International Publication No. 93/015726
[Patent Document 2] US Pat. No. 4,497,794.
Surprisingly, the clinical efficacy of acne control, which is substantially similar to that obtained by using a water-soluble topical preparation containing 5.0% benzoyl peroxide, is a saturated aqueous solution of water and a water-miscible organic solvent. It was discovered that it can be obtained by providing a water-soluble topical preparation containing a low concentration of benzoyl peroxide in a suspended state. All% concentrations herein mean% w / w. The preparation of the present invention reduces the irritation to the skin caused by the application of the preparation without impairing the clinical efficacy as compared with the case of applying a similar 5.0% benzoyl peroxide preparation. ..
In one example, the present invention is a pharmaceutical preparation for topical application containing water, a water-miscible organic solvent, and benzoyl peroxide, and the ratio of the concentration of water and the organic solvent in the preparation is high. It is a pharmaceutical product with a low concentration of benzoyl peroxide. As used herein, the term "low concentration" means less than 5.0% w / w when referring to the concentration of benzoyl peroxide in a pharmaceutical product. Preferably, the pharmaceutical preparation is a water-soluble gel preparation. Preferably, the pharmaceutical preparation does not contain a surfactant.
The benzoyl peroxide is dispersed in the pharmaceutical product in a uniform suspension state. Preferably, the suspended benzoyl peroxide has an average particle size of less than 100 microns, more preferably between 1 and 50 microns, and even more preferably between 2.5 and 30 microns. is there. Inevitably, a part of the benzoyl peroxide is dissolved in the organic solvent, and a small part of the benzoyl peroxide is dissolved in the water. Therefore, the preparation becomes a saturated solution of benzoyl peroxide, and the dissolved concentration of benzoyl peroxide is higher than that dissolved in water containing no organic solvent.
In a preferred embodiment, but not necessarily, the formulation of the present invention further comprises at least one compound effective in treating acne. The compound having an acne-suppressing effect may be suspended or dissolved in the formulation. Preferably, the compound having an acne-suppressing action is water-soluble and is dissolved in the preparation. One such preferred compound with acne-suppressing activity is an antibiotic. Preferred antibiotics are macrolide antibiotics and lincomycin antibiotics, macrolide antibiotics are erythromycin, azithromycin, clarithromycin, tyrosin, and tyrosin, lincomycin antibiotics are clindamycin, and lincomycin. It contains mycin. In the above-mentioned preparation according to the present invention, a particularly preferable antibiotic for use in combination with benzoyl peroxide is clindamycin hydrochloride or clindamycin such as clindamycin phosphate. Salicylic acid, azelaic acid, niacinamide, urea, and tretinoin, adapalene, as additional topical acne-suppressing active ingredients that can be included in the above-mentioned preparations of the present invention with or without the presence of antibiotics. Contains retinoids such as tazarotene.
When the further acne-suppressing compound is contained in the formulation according to the present invention, it is preferably present at a concentration at which a clear acne-suppressing effect is exhibited in the absence of benzoyl peroxide. For example, if cylindermycin is present in the formulation of the present invention, the concentration of the cylindermycin is preferably at least 0.5%, more preferably 1%. It may be used in the above-mentioned preparation at a higher concentration of cylinder mycin, for example, 2.5%, 5.0% or more.
The organic solvent of the pharmaceutical product according to the present invention has the following properties: (1) Miscible with water (2) Does not chemically react with benzoyl peroxide at temperatures between 0 ° C and 40 ° C. (3) It is a liquid at a temperature between 0 ° C and 40 ° C. (4) Benzoyl peroxide can be dissolved at an external temperature at a concentration of at least 0.1%. (5) Water-soluble gel-like benzoyl peroxide can be dispersed in the absence of a surfactant.
An example of a preferable organic solvent of the above-mentioned preparation according to the present invention is a polyol known as a polyhydric alcohol. Representative examples of polyols include glycols and sugar alcohols. Preferred polyols for the above-mentioned preparations of the present invention include polyether glycols such as ethoxydiglycol and propylene glycol. A preferred water-miscible organic solvent is propylene glycol. The inventor of the present application has measured by HPLC analysis that benzoyl peroxide is soluble in 100% propylene glycol at room temperature at a concentration of 0.2% to 0.3% w / w. The second preferred organic solvent is ethoxydiglycol, which is commercially available under the trade name Transctool® (Gatefosse, France, Sanpriest) and the like. By HPLC analysis, benzoyl peroxide was measured to dissolve in ethoxydiglycol at a concentration of about 4.9% at room temperature. Another preferred organic solvent is polyethylene glycol such as PEG400.
The concentration of the organic solvent in the formulation should be high enough to provide a stable suspension of benzoyl peroxide in a detergent-free water-soluble fluid. In addition, the concentration of the organic solvent should be lower than the concentration at which all of the benzoyl peroxide in the preparation is dissolved after all the water is removed from the preparation. Generally, the concentration of the organic solvent should be between 1 and 4 times the concentration of benzoyl peroxide in the formulation.
Furthermore, the ratio of the concentration of water to the organic solvent in the formulation should be high. This is to keep the benzoyl peroxide in the formulation in which water evaporates from the formulation and remains on the skin after the application of the formulation at or near saturated solubility, thereby remaining on the skin in the formulation. This is to maximize the thermodynamic activity of the benzoyl peroxide. Therefore, the relative concentrations of water and the organic solvent in the formulation of the present invention are at least 7: 1, such as at least 9: 1 or 10: 1, preferably at least 12: 1, 1, and most preferably at least 20: 1. , For example up to 98: 1 is preferred
The concentration of benzoyl peroxide in the above-mentioned preparation is less than 5.0%, that is, an amount effective for treating the signs and / or symptoms of acne. At the concentration of benzoyl peroxide in the above-mentioned preparation of the present invention, irritation to the skin is reduced as compared with the preparation containing 5.0% benzoyl peroxide. Therefore, concentrations of benzoyl peroxide between 1.0% and 4.5% are suitable for the present invention. The preferred benzoyl peroxide concentration range is between 2.0% and 3.5%. The most preferred concentration of benzoyl peroxide is about 2.5%, i.e. between 2.3% and 2.7%.
The preparation is one of many types of topical preparations containing water as a main component, and includes liquid preparations, gel preparations, cream preparations, spray preparations, effervescent preparations and the like. Although not essential, the formulation is preferably in the form of a water-soluble gel. Therefore, the formulation according to the present invention may contain a gelling agent or a thickener. The water-dispersible gelling agent is suitable for use in epithelial tissues such as skin, and is suitable for use in the composition of the present invention as long as it is in a water-soluble gel state having a substantially uniform concentration. There is. One of the preferred gelling agents is hydroxypropyl cellulose, which is commercially available, for example, under the trade name KLUCEL® (Heracles Incorporated, Wilmington, Delaware, USA). Another preferred gelling agent is hydroxyethyl cellulose, which is commercially available, for example, under the trade name NATROSOL® (Heracles Incorporated). Other suitable gelling agents are carboxyvinyl polymers, also known as carbomer, such as, for example, the trade names CARBOPOL® 934, 940, 941, 980, and 981 (BF Goodrich). Co. , United States, Akron, Ohio), ETD2020 , and ULTRZ® (Noveon, Inc., Cleveland, Ohio, USA). In addition to these, suitable gelling agents include polyvinyl alcohol, polyethylene oxide, propylene glycol alginate, methyl cellulose, hydroxypropyl methyl cellulose, and natural polymer gums such as xanthan and carrageenan. The concentration of the gelling agent in the composition can vary depending on several factors, which include the desired degree of stability of the BPO suspension and the desired viscosity of the gel composition.
If necessary, the formulations of the present invention may further contain excipients commonly used in the formulations and well known to those skilled in the art and pharmaceutically acceptable. Such excipients include, for example, moisturizers, emollients, pH stabilizers, preservatives, chelating agents, antioxidants and the like.
The preparation of the present invention can be used to treat acne by applying the preparation to the affected part of the skin, that is, the face, neck, back, waist and the like. The formulation is preferably applied once or more daily for a period sufficient to ameliorate the symptoms of acne. Surprisingly, it was found that the formulation of the present invention containing 2.5% benzoyl peroxide has the same efficacy as that obtained by the formulation containing 5.0% benzoyl peroxide. Both of these formulations contain 1% clindamycin antibiotics. Even more surprisingly, this equivalent efficacy was observed when the above-mentioned preparation of the present invention was applied only once a day, and the preparation containing 5.0% of benzoyl peroxide was applied twice a day. is there.
The formulation of the present invention can also be used for the treatment of rosacea. In order to treat rosacea, it is preferable to apply the preparation of the present invention to the affected area once or more once a day for a sufficient period of time until the signs and symptoms of rosacea are improved.
The formulation of the present invention can be prepared by any method such that the components of the present invention are mixed to provide a pharmaceutical formulation. For example, the suspension of benzoyl peroxide is prepared by mixing water, the water-miscible organic solvent, and benzoyl peroxide. Preferably the mixtures are mixed by, for example, stirring, ultrasonic decomposition, milling, or vibration, thereby producing a uniform suspension of benzoyl peroxide particles in water and organic solvents. As additional ingredients, for example, a gelling agent or other excipient may be added either before or after the uniform suspension is made.
When an additional acne-suppressing agent is included in the preparation, it may be mixed with other components after or before the suspension of benzoyl peroxide is formed. As an alternative method, there is a method of providing a water-soluble solution of the acne-suppressing agent (for example, clindamycin) and mixing the solution with a suspension of the benzoyl peroxide to obtain a final preparation.
The present invention is further illustrated by the following examples, but these are exemplary and are not intended to be limiting.
Example 1-Exemplary formulation of the present invention The pharmaceutical formulation of the present invention was formulated so as to contain the following components shown in FIG.
<tables num="1"><img id="000002" he="44" wi="159" file="0005677693.tif" img-format="tif" img-content="drawing" /></tables>
Example 2-Exemplary formulation of the present invention The pharmaceutical preparation of the present invention containing the acne-suppressing agent in addition to benzoyl peroxide was prepared so as to contain the following components shown in FIG.
<tables num="2"><img id="000003" he="53" wi="159" file="0005677693.tif" img-format="tif" img-content="drawing" /></tables>
Example 3-Comparative effectiveness The effectiveness of the water-soluble gel preparation of Example 2 containing benzoyl peroxide 2.5%, propylene glycol 5%, water 89%, and clindamycin 1% for acne lesions. It was tested in a large clinical study in which 399 patients were treated. The preparation according to the present invention is referred to as preparation A. A similar water-soluble gel formulation containing 5.0% benzoyl peroxide, 10% propylene glycol, 82.5% water, and 1.0% clindamycin was prepared and set to closely resemble its effectiveness against acne lesions. Tested in the second clinical study of. This product (not according to the present invention) is referred to as the product B. These results are based on the results of a water-soluble gel commercial product containing 5.0% benzoyl peroxide, 1% clindamycin, sodium dioctyl sulfosuccinate (surfactant), and water (BenzaClin® topical gel, Dermic Laboratories). , Bridgewater, NJ) compared to the data provided in the prescription information. This prior art preparation is referred to as preparation C. The formulations A and B do not contain a surfactant. The product A was applied only once a day, while the products B and C (each containing 5.0% benzoyl peroxide) were applied twice a day during the 12-week treatment period. Pharmaceutical A was tested after 12 weeks of application. The data of formulations B and C are after 10 weeks of application.
The subject was instructed to apply the product B and C twice a day and the product A once a day to the face. The average reduction rate of inflammatory lesions and non-inflammatory acne lesions was measured after 10 weeks for the preparations B and C and 12 weeks after the preparation A. The reduction rate of inflammatory lesions (pustules and papules) is calculated by multiplying the standard value of the total number of inflammatory lesions minus the total number of inflammatory lesions at the end of the survey (10 or 12 weeks later) by 100. It was calculated by dividing by the reference value of the total number of inflammatory lesions. Non-inflammatory lesions had open and closed comedones, and the reduction rate of non-inflammatory lesions was calculated by the same method. The results of the acne survey are shown in Table 3.
<tables num="3"><img id="000004" he="37" wi="159" file="0005677693.tif" img-format="tif" img-content="drawing" /></tables>
The data in Table 3 show that the efficacy of formulation A containing only 2.5% benzoyl peroxide is similar to the efficacy of formulations B and C. These results are particularly surprising in that the preparation A is applied only once a day, while the preparations B and C are applied twice a day.
Example 4-Possibility of stimulation The formulations A and B of Example 3 each contained benzoyl peroxide and 1.0% clindamycin, and tests were conducted to verify a comparison of the irritation potential of these two formulations. The pharmaceutical product A according to the present invention contains 2.5% benzoyl peroxide, propylene glycol twice the concentration of benzoyl peroxide, and water 17.8 times the concentration of propylene glycol. The pharmaceutical product B contains 5.0% benzoyl peroxide, propylene glycol twice the concentration of benzoyl peroxide, and 8.25 times the concentration of propylene glycol water.
Gel formulations A and B were applied to the backs of 33 healthy subjects under separate closed patches three times a week for three weeks. For each application, the evaluator observes signs of irritation and inflammation 48 hours after each application and is based on a rating scale of 0 (no signs of inflammation) to 4 (erythema with edema and blistering). Scores were determined using a standardized stimulus scoring system. The data from this study showed that the use of the product A of the present invention reduced the cumulative inflammation score by 33% compared to the use of the product B.
Further modifications, uses, and applications of the invention described herein will be apparent to those skilled in the art. Such changes are intended to be incorporated into the above description and the following claims.
51 members in 15 offices
Priority claims8
| Document | Office | Kind | Date |
|---|---|---|---|
| 13101408 | United States of America | P | |
| 13101408 | United States of America | P | |
| 2009003367 | United States of America | W | |
| 2009003367 | United States of America | W | |
| 61131014 | – | – | – |
| US20080131014P | – | – | – |
| US2009003367 | – | – | – |
| WO2009US03367 | – | – | – |
Members51
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| WO2009148584A1 | World Intellectual Property Organization (WIPO) | A1 | |
| KR20110014651A | Republic of Korea | A | |
| EP2299810A1 | European Patent Office (EPO) | A1 | |
| MX2010013152A | Mexico | A | |
| CN102056481A | China | A | |
| JP2011522820A | Japan | A | |
| ZA201008265B | South Africa | B | |
| RU2010146038A | Russian Federation | A | |
| US8288434B2 | United States of America | B2 | |
| US2013012460A1 | United States of America | A1 | |
| US2013236549A1 | United States of America | A1 | |
| RU2493847C2 | Russian Federation | C2 | |
| EP2299810A4 | European Patent Office (EPO) | A4 | |
| US2014050792A1 | United States of America | A1 | |
| US2014051649A1 | United States of America | A1 | |
| US8663699B2 | United States of America | B2 | |
| US2014134252A1 | United States of America | A1 | |
| US2014235560A1 | United States of America | A1 | |
| RU2013122395A | Russian Federation | A | |
| US8895070B2 | United States of America | B2 | |
| JP5677693B2This record | Japan | B2 | |
| JP2015038093A | Japan | A | |
| AU2009255679B2 | Australia | B2 | |
| US9078870B2 | United States of America | B2 | |
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| CA2723029C | Canada | C | |
| US2016220528A1 | United States of America | A1 | |
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| US2019125776A1 | United States of America | A1 | |
| BRPI0913326B1 | Brazil | B1 | |
| BRPI0913326B8 | Brazil | B8 | |
| EP2299810B1 | European Patent Office (EPO) | B1 | |
| PT2299810T | Portugal | T | |
| US10624918B2 | United States of America | B2 | |
| HRP20200450T1 | Croatia | T1 | |
| ES2773931T3 | Spain | T3 | |
| US2020276218A1 | United States of America | A1 | |
| BRPI0913326C1 | Brazil | C1 | |
| US11478498B2 | United States of America | B2 | |
| US2023047106A1 | United States of America | A1 |
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Numbers
- Publication
- 5677693
- Publication, DOCDB
- 5677693
- Publication, EPODOC
- JP5677693B
- Application
- 2011512469
- Application, DOCDB
- 2011512469
- Application, EPODOC
- JP20110512469
Titles2
- Japanese
- 水及び水混和性有機溶媒中に懸濁する低濃度過酸化ベンゾイルを含む局所用医薬品製剤
- English
- Topical pharmaceutical formulation containing low concentration benzoyl peroxide suspended in water and a water-miscible organic solvent
Classification
- CPC, 26
- A61K31/7056
- A61K9/08
- A61K9/10
- A61K31/075
- A61K47/10
- A61K8/38
- A61K45/06
- A61Q19/00
- A61K8/0241
- A61K8/042
- A61K8/044
- A61K8/345
- A61K8/55
- A61K2800/33
- A61K2800/413
- A61K9/0014
- A61K31/235
- A61K31/327
- A61P17/00
- A61P17/10
- A61P43/00
- A61K31/192
- A61K47/32
- A61K2121/00
- A61K31/325
- A61K9/14
- IPC, 7
- A61K31 327
- A61K9 08
- A61K47 10
- A61K47 32
- A61P17 00
- A61P17 10
- A61P43 00