The topical corticosteroids constitute a class of primarily synthetic steroids used as anti-inflammatory and antipruritic agents.
TOPICAL CREAM USP, 0.1%
Each gram of Amcinonide Cream contains 1 mg of the active steroid amcinonide in a white, smooth, homogeneous, opaque emulsion composed of benzyl alcohol (as preservative), emulsifying wax, glycerin, isopropyl palmitate, lactic acid, purified water and sorbitol solution 70%.
TOPICAL OINTMENT USP, 0.1%
Each gram of Amcinonide Ointment contains 1 mg of the active steroid amcinonide in a specially formulated base composed of benzyl alcohol 2.2% (wt/wt) as preservative, butylated hydroxyanisole, citric acid anhydrous, emulsifying wax, propyl gallate, propylene glycol, and white petrolatum.
Chemically, amcinonide is:
Pregna-1,4-diene-3,20-dione, 21-(acetyloxy)-16,17-[cyclopentylidenebis (oxy)]-9-fluoro-11-hydroxy-, (11β, 16α).
Topical corticosteroids share anti-inflammatory, antipruritic and vasoconstrictive actions.
The mechanism of anti-inflammatory activity of the topical corticosteroids is 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.
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.
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.