Compositions and methods for topical application of therapeutic agents
First Claim
1. A method for the treatment of dermatological conditions comprising applying topically a semisolid gel composition, the semisolid gel composition comprising:
- a semisolid aqueous gel;
a first pharmaceutical partially in a microparticulate form and partially dissolved in said semisolid aqueous gel; and
a second pharmaceutical dissolved in said semisolid aqueous gel;
wherein;
the first pharmaceutical provides optimized delivery for early state lesions when dissolved and optimized delivery for later state lesions when present as a microparticulate; and
said second pharmaceutical provides benefit throughout lesion progression.
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Abstract
The present invention generally relates to pharmaceutical compositions that enable control of drug delivery properties and the development of optimal drug delivery strategies customized for particular drugs and particular diseases. The composition includes a dissolved pharmaceutical that has the capacity to permeate the stratum corneum layer of the epidermis and become available systemically, and a pharmaceutical in a microparticulate state that does not readily cross the stratum corneum of the epidermis. The dissolved and microparticulate pharmaceuticals may be the same or different pharmaceuticals. Methods for the preparation and use of the compositions are also provided. In a preferred embodiment, the invention finds particular use in a formulation for the topical application of dapsone for the treatment of acne. In another preferred embodiment, the invention finds particular use for the treatment of herpes lesions.
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Citations
16 Claims
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1. A method for the treatment of dermatological conditions comprising applying topically a semisolid gel composition, the semisolid gel composition comprising:
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a semisolid aqueous gel; a first pharmaceutical partially in a microparticulate form and partially dissolved in said semisolid aqueous gel; and a second pharmaceutical dissolved in said semisolid aqueous gel;
wherein;the first pharmaceutical provides optimized delivery for early state lesions when dissolved and optimized delivery for later state lesions when present as a microparticulate; and said second pharmaceutical provides benefit throughout lesion progression. - View Dependent Claims (2, 3, 4, 5)
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6. A method for treating disease comprising applying topically an aqueous gel composition comprising a dissolved pharmaceutical and a microparticulate pharmaceutical;
- wherein;
the dissolved pharmaceutical crosses the stratum corneum of the epidermis to become systemically available; and the microparticulate pharmaceutical minimally crosses the stratum corneum in its microparticulate state. - View Dependent Claims (7, 8)
- wherein;
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9. A method for treating acne comprising topically applying a gel composition comprising a dissolved anti-inflammatory pharmaceutical and a microparticulate antimicrobial pharmaceutical, wherein:
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the dissolved anti-inflammatory pharmaceutical crosses the stratum corneum of the epidermis and is absorbed into the lower two-thirds of the pilosebaceous unit; and the microparticulate antimicrobial pharmaceutical is primarily delivered into the upper third of the pilosebaceous unit, crossing the stratum corneum of the epidermis only minimally. - View Dependent Claims (10)
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11. A method for preparing a dermatological gel composition, comprising:
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dissolving methylparaben and propylparaben in a solvent to form a solution; dissolving a pharmaceutical in the solution to form a pharmaceutical component; contacting water and a polymer to form a homogeneous dispersion; contacting the pharmaceutical component and the homogeneous dispersion to form a pharmaceutical dispersion; and contacting the pharmaceutical dispersion and a caustic material to form a dermatological gel composition;
wherein;the solvent is ethoxydiglycol or 1-methyl-2-pyrrolidone; and the dermatological gel composition comprises dissolved pharmaceutical and microparticulate pharmaceutical. - View Dependent Claims (12, 13)
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14. A method for preparing a dermatological gel composition, comprising:
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dissolving methylparaben and propylparaben in a solvent to form a solution; dissolving a pharmaceutical in the solution to form a pharmaceutical component; contacting water and the pharmaceutical component to form a first pharmaceutical dispersion; contacting the first pharmaceutical dispersion and a polymer to form a second pharmaceutical dispersion; and contacting the second pharmaceutical dispersion and a caustic material to form a dermatological gel composition;
wherein;the solvent is ethoxydiglycol or 1-methyl-2-pyrrolidone; and the dermatological gel composition comprises dissolved pharmaceutical and microparticulate pharmaceutical. - View Dependent Claims (15, 16)
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Specification