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Mycolog-II (Nystatin / Triamcinolone Acetonide Topical) - Description and Clinical Pharmacology

 
 



MYCOLOG®-II
Nystatin and Triamcinolone Acetonide Cream USP

For Dermatologic Use Only

NOT FOR OPHTHALMIC USE

DESCRIPTION

MYCOLOG-II Cream (Nystatin and Triamcinolone Acetonide Cream) for dermatologic use contains the antifungal agent nystatin and the synthetic corticosteroid triamcinolone acetonide.

Nystatin is a polyene antimycotic obtained from Streptomyces noursei. It is a yellow to light tan powder with a cereal-like odor, very slightly soluble in water, and slightly to sparingly soluble in alcohol. Structural formula:

Triamcinolone acetonide is designated chemically as 9-fluoro-11β, 16α, 17, 21-tetrahydroxypregna-1, 4-diene-3, 20-dione cyclic 16, 17-acetal with acetone. The white to cream crystalline powder has a slight odor, is practically insoluble in water, and very soluble in alcohol. Structural formula:

MYCOLOG-II (Nystatin and Triamcinolone Acetonide Cream) is a soft, smooth, cream having a light yellow to buff color. Each gram provides 100,000 units of nystatin and 1.0 mg triamcinolone acetonide in an aqueous perfumed vanishing cream base with aluminum hydroxide concentrated wet gel, titanium dioxide, glyceryl monostearate, polyethylene glycol monostearate, simethicone, sorbic acid, propylene glycol, white petrolatum, cetearyl alcohol (and) ceteareth-20, and sorbitol solution.

CLINICAL PHARMACOLOGY

Nystatin

Nystatin exerts its antifungal activity against a variety of pathogenic and nonpathogenic yeasts and fungi by binding to sterols in the cell membrane. The binding process renders the cell membrane incapable of functioning as a selective barrier. Nystatin provides specific anticandidal activity to Candida (Monilia) albicans and other Candida species, but is not active against bacteria, protozoa, trichomonads, or viruses.

Nystatin is not absorbed from intact skin or mucous membranes.

Triamcinolone Acetonide

Triamcinolone acetonide is primarily effective because of its anti-inflammatory, antipruritic and vasoconstrictive actions, characteristic of the topical corticosteroid class of drugs. The pharmacologic effects of the topical corticosteroids are well-known; however, the mechanisms of their dermatologic actions are unclear. Various laboratory methods, including vasoconstrictor assays, are used to compare and predict potencies and/or clinical efficacies of the topical corticosteroids. There is some evidence to suggest that a recognizable correlation exists between vasoconstrictor potency and therapeutic efficacy in man.

Pharmacokinetics

The extent of percutaneous absorption of topical corticosteroids is determined by many factors including the vehicle, the integrity of the epidermal barrier, and the use of occlusive dressings (see DOSAGE AND ADMINISTRATION).

Topical corticosteroids can be absorbed from normal intact skin. Inflammation and/or other disease processes in the skin increase percutaneous absorption. Occlusive dressings substantially increase the percutaneous absorption of topical corticosteroids (see DOSAGE AND ADMINISTRATION).

Once absorbed through the skin, topical corticosteroids are handled through pharmacokinetic pathways similar to systemically administered corticosteroids. Corticosteroids are bound to plasma proteins in varying degrees. Corticosteroids are metabolized primarily in the liver and are then excreted by the kidneys. Some of the topical corticosteroids and their metabolites are also excreted into the bile.

Nystatin and Triamcinolone Acetonide

During clinical studies of mild to severe manifestations of cutaneous candidiasis, patients treated with MYCOLOG II (Nystatin and Triamcinolone Acetonide Cream) showed a faster and more pronounced clearing of erythema and pruritus than patients treated with nystatin or triamcinolone acetonide alone.

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