Patent Application
20070129446
The present invention relates to the field of treating rosacea. The invention is directed towards providing novel pharmaceutical compositions, more particularly dermatological compositions, which are useful for treating rosacea and which comprise fepradinol as active agent.
Rosacea is a common, chronic and progressive inflammatory dermatitis associated with vascular instability. It mainly affects the central part of the face and is characterized by redness of the face or hot flushes, facial erythema, papules, pustules and telangiectasia. In serious cases, especially in men, the soft tissue of the nose may swell and produce a bulbous swelling known as rhinophyma.
Rosacea generally occurs between the ages of 25 and 70, and is much more common in people of fair complexion. It more particularly affects women, although this affection is generally more severe in men. Rosacea is chronic and lasts for years with periods of exacerbation and of remission.
Rosacea was originally called “acne rosacea” because its papules (points of slight raising of the skin) and its inflammatory pustules (pus scabs) greatly resemble those of common acne. In contrast with common acne, whose aetiology is based on abnormal keratinization, an increase in sebum production and also bacterial inflammation, the inflammation of rosacea is vascular in nature and is poorly understood. The result of this facial vascular anomaly is a permanent oedema of the dermis, which may be accompanied by an increased colonization with Demodex folliculorum, a mite usually found in the follicles of the face. This parasite might trigger inflammatory phenomena reflected by papules and pustules.
The pathogenesis of rosacea is poorly understood. Many factors may be involved without necessarily inducing this complaint. They are, for example, psychological factors, gastrointestinal disorders, environmental factors (exposure to sunlight, temperature, humidity), emotional factors (stress), dietary factors (alcohol, spices), hormonal factors or vascular factors, or even infection with Helicobacter pilori.
Rosacea develops in four stages, but passage through all the stages is not obligatory:
The minor forms of rosacea may be treated with active agents such as anti-seborrhoeic agents and anti-infectious agents, for example benzoyl peroxide, retinoic acid or metronidazole (antiparasitic agent). As regards the most diffuse forms of the complaint, they respond well to general antibiotic therapy with cyclines. However, these treatments have unpleasant side effects for the patient, such as irritation or intolerance phenomena.
Furthermore, on account of the multi-factor aspect of rosacea, there are a huge number of treatments for this condition, but the search continues for an effective treatment that is without risk for the patient.
The Applicant has now demonstrated the advantageous properties of a compound belonging to the non-steroidal anti-inflammatory family (NSAIDs), fepradinol, for treating rosacea.
NSAIDs are classified as a function of their chemical structure:
NSAIDs are anti-inflammatory compounds known in the prior art for their analgesic and antipyretic properties. NSAIDS are anti-inflammatory compounds known in the prior art for their analgeric and anti-pyrelic properties. Fepradinol, or alpha-[(2-hydroxy-1,1-dimethylethyl]amino]methyl]benzyl alcohol, is sold in particular by the Petrone group in the pharmaceutical composition Dalgen for treating muscular imflammation.
Fepradinol corresponds to the following formula:
Moreover, patent application EP 0 270 316 describes the use of NSAIDs in topical compositions, in combination with 1-substituted imidazole, for treating acne. International patent application WO 02/074 290 discloses the use of certain NSAIDs in pharmaceutical preparations for treating rosacea.
However, it has never been proposed to use fepradinol to treat rosacea. In the context of the present invention, it has now been found that fepradinol has particularly advantageous properties in the treatment of rosacea, such as, especially, increased efficacy in particular in the case of individuals with fair or sensitive skin, a considerable dimunition of the side effects, probable efficacy in all the stages of rosacea and limitation of the phenomena of recurrence.
As indicated previously, the invention is directed towards offering a novel method for the pharmaceutical and preferentially dermatological treatment of rosacea, which consists in topically administering an effective amount of fepradinol to an individual suffering from this condition.
Consequently, the invention relates more particularly to the use of fepradinol for the preparation of a pharmaceutical composition and more particularly a dermatological composition, for topical application to the skin, for treating rosacea.
According to the present invention, the term “treating rosacea” means treating and/or preventing rosacea, at one or more of the stages described previously.
According to a first embodiment of the invention, the composition is for treating the first stage of rosacea.
According to a second embodiment of the invention, the composition is for treating the second stage of rosacea.
According to a third embodiment of the invention, the composition is for treating the third stage of rosacea.
According to a fourth embodiment of the invention, the composition is for treating the fourth stage of rosacea.
According to a first preferential embodiment, the composition contains 0.0001% to 20% of fepradinol and more preferentially 0.001% to 10% of fepradinol (expressed as a weight percentage).
According to a second preferential embodiment, the composition contains 0.1% to 6% of fepradinol (expressed as a weight percentage).
According to a third preferential embodiment, the composition in cream form contains about 6% of fepradinol (expressed as a weight percentage).
Needless to say, besides the use of fepradinol, the present invention relates to the use of derivatives thereof. The term “derivatives” means compounds that differ from fepradinol by substitution, addition or removal of one or more chemical groups.
Advantageously, the compositions of the invention comprise, besides fepradinol, at least one other therapeutic agent capable of increasing the efficacy of the treatment. Non-limiting examples of such agents that may be mentioned include antibiotics, antibacterial agents, antiviral agents, antiparasitic agents, antifungal agents, anaesthetics, analgesics, antiallergic agents, retinoids, free-radical scavengers, anti-priruginous agents, keratolytic agents, anti-seborrhoeic agents, antihistamines, sulfides, immunosuppressant products and antiproliferative agents.
According to one preferential embodiment, the composition of the present invention also contains metronidazole.
The term “metronidazole” especially means 1-(2-hydroxy-ethyl)-2-methyl-5-nitroimidazole, but also analogues and derivatives thereof, which are especially soluble in the formulation excipients that are suitable for the galenical form used.
The compositions of the invention may also comprise any additive usually used in the pharmaceutical or dermatological field that is compatible with fepradinol. Mention may be made especially of sequestrants, antioxidants, sunscreens, preserving agents, for example DL-α-tocopherol, fillers, electrolytes, humectants, dyes, common mineral or organic acids or bases, fragrances, essential oils, cosmetic active agents, moisturizers, vitamins, essential fatty acids, sphingolipids, self-tanning compounds such as DHA, skin calmative and protective agents such as allantoin, pro-penetrating agents and gelling agents. Needless to say, a person skilled in the art will take care to select this or these optional additional compound(s), and/or the amount thereof, such that the advantageous properties of the composition according to the invention are not, or are not substantially, adversely affected.
These additives may be present in the composition in a proportion of from 0 to 20% by weight relative to the total weight of the composition.
Examples of sequestrants that may be mentioned include ethylenediaminetetraacetic acid (EDTA), and also derivatives or salts thereof, dihydroxyethylglycine, citric acid and tartaric acid, or mixtures thereof.
Examples of preserving agents that may be mentioned include benzalkonium chloride, phenoxyethanol, benzyl alcohol, diazolidinylurea and parabens, or mixtures thereof.
Examples of humectants that may be mentioned include glycerol and sorbitol.
The compositions of the invention may contain one or more pro-penetrating agents in preferential concentrations ranging from 0 to 20% and more preferentially ranging from 0.6% to 3% by weight relative to the total weight of the composition. Among the pro-penetrating agents that are preferentially used, without this list being limiting, are compounds such as propylene glycol, dipropylene glycol, propylene glycol dipelargonate, lauroglycol and ethoxydiglycol.
Advantageously, the compositions according to the invention may also contain one or more wetting liquid surfactants in preferential concentrations ranging from 0 to 10% and more preferentially ranging from 0.1% to 2%. Among the wetting agents that are preferentially used, without this list being limiting, are compounds of the Poloxamer family and more particularly Poloxamer 124 and/or Poloxamer 182.
The compositions of the present invention may be in any galenical form normally used for topical application, especially in the form of aqueous, aqueous-alcoholic or oily solutions, dispersions of the lotion type, aqueous, anhydrous or lipophilic gels, emulsions of liquid or semi-liquid consistency of the milk type, obtained by dispersing a fatty phase in an aqueous phase (O/W) or, conversely, (W/O), or suspensions or emulsions of soft, semi-solid or solid consistency of the cream, gel or ointment type, or alternatively microemulsions, microcapsules, microparticles or vesicular dispersions of ionic and/or nonionic type.
Preferably, the creams may be formulated from a mixture of mineral oil or from a mixture of beeswax and of water, which emulsifies instantaneously, to which is added the fepradinol, dissolved in a small amount of oil such as almond oil.
The ointments may be formulated by mixing a solution of fepradinol in an. oil such as almond oil in warmed paraffin, followed by leaving the mixture to cool.
As examples of compositions according to the invention, mention may be made of those comprising an active phase containing (expressed as weight percentages):
The aqueous phase of a composition according to the invention in the form of an emulsion may comprise water, a floral water such as cornflower water or a natural spring or mineral water chosen, for example, from eau de Vittel, the waters of the Vichy basin, eau d'Uriage, eau de la Roche Posay, eau de la Bourboule, eau d'Enghien-les-Bains, eau de Saint Gervais-les-Bains, eau de Néris-les-Bains, eau d'Allevard-les-Bains, eau de Digne, eau de Maizières, eau de Neyrac-les-Bains, eau de Lons-le-Saunier, les Eaux Bonnes, eau de Rochefort, eau de Saint Christau, eau des Fumades, eau de Tercis-les-Bains, eau d'Avène and eau d'Aix-les-Bains.
The said aqueous phase may be present in a content of between 10% and 90% by weight and preferably between 20% and 80% by weight relative to the total weight of the composition.
A pH-independent gelling agent is one capable of imparting to the composition a viscosity sufficient to hold the retinoid and the benzoyl peroxide in suspension even under the influence of a pH change due to the release of benzoic acid by the benzoyl peroxide.
Non-limiting examples that may be mentioned include gelling agents of the polyacrylamide family such as the sodium acryloyldimethyltaurate copolymer/isohexa-decane/polysorbate-80 mixture sold under the name Simulgel 600 by the company SEPPIC, the polyacrylamide/C13-14 isoparaffin/laureth-7 mixture, for instance the product sold under the name Sepigel 305 by the company SEPPIC, the family of acrylic polymers coupled to hydrophobic chains, such as the PEG-150/decyl/SMDI copolymer sold under the name Aculyn 44 (polycondensate comprising at least, as components, a polyethylene glycol containing 150 or 180 mol of ethylene oxide, decyl alcohol and methylenebis(4-cyclohexyl isocyanate) (SMDI), at 35% by weight in a mixture of propylene glycol (39%) and water (26%)), and the family of modified starches such as the modified potato starch sold under the name Structure Solanace, or mixtures thereof.
The preferred gelling agents are derived from the polyacrylamide family, such as Simulgel 600 or Sepigel 305 or mixtures thereof.
The gelling agent as described above may be used in preferential concentrations ranging from 0.1% to 15% and more preferentially ranging from 0.5% to 5%.
The gels may preferably be prepared by dispersing or dissolving fepradinol in a suitable ratio in a gel of carbomer, poloxamer or cellulose-based type.
In this example, various concrete formulations based on compounds according to the invention are illustrated.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0313664 | Nov 2003 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/FR04/02900 | 11/10/2004 | WO | 12/14/2006 |
