DESOXIMETASONE- desoximetasone cream
E. Fougera & Co., a division of Fougera Pharmaceuticals Inc.
Rx only
FOR TOPICAL USE ONLY. NOT FOR ORAL, OPHTHALMIC, OR INTRAVAGINAL USE.
DESCRIPTION:
Desoximetasone Cream USP 0.25% contains the active synthetic corticosteroid desoximetasone. The topical corticosteroids constitute a class of primarily synthetic steroids used as anti-inflammatory and antipruritic agents.
Each gram of desoximetasone cream USP 0.25% contains 2.5 mg of desoximetasone in an emollient cream base consisting of white petrolatum, purified water, isopropyl myristate, lanolin alcohols, mineral oil, and cetostearyl alcohol.
The chemical name of desoximetasone is: Pregna-1,4-diene-3,20-dione,9-fluoro-11,21-dihydroxy-16-methyl-,(11?,16?)-.
Desoximetasone has the molecular formula C22 H29 FO4 and the molecular weight of 376.47. The CAS Registry Number is 382-67-2.
The structural formula is:
Structural Formula
(click image for full-size original)
CLINICAL PHARMACOLOGY:
Topical corticosteroids share anti-inflammatory, anti-pruritic 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.
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.
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. Thus, occlusive dressings may be a valuable therapeutic adjunct for treatment of resistant dermatoses.
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.
Pharmacokinetic studies in men with desoximetasone cream USP 0.25% with tagged desoximetasone showed a total of 5.2% � 2.9% excretion in urine (4.1% � 2.3%) and feces (1.1% � 0.6%) and no detectable level (limit of sensitivity: 0.005 ug/mL) in the blood when it was applied topically on the back followed by occlusion for 24 hours. Seven days after application, no further radioactivity was detected in urine or feces. The half-life of the material was 15 � 2 hours (for urine) and 17 � 2 hours (for feces) between the third and fifth trial day. Studies with other similarly structured steroids have shown that predominant metabolite reaction occurs through conjugation to form the glucuronide and sulfate ester.
INDICATIONS AND USAGE:
Desoximetasone cream USP 0.25% is indicated for the relief of the inflammatory and pruritic manifestations of corticosteroid-responsive dermatoses.
