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Fluocinonide (Fluocinonide Topical) - Description and Clinical Pharmacology

 
 



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DESCRIPTION

Fluocinonide Cream USP, 0.05%, Fluocinonide Cream USP, 0.05% (Emulsified Base), Fluocinonide Gel USP, 0.05% and Fluocinonide Ointment USP, 0.05% are intended for topical administration. The active component in each is the corticosteroid fluocinonide, which is the 21-acetate ester of fluocinolone acetonide and has the chemical name pregna-1,4-diene-3,20-dione,21-(acetyloxy) -6,9-difluoro-11-hydroxy-16,17-[(1-methylethylidene)bis(oxy)]-,(6a,11b,16a)-. It has the following chemical structure:

Mol. Formula: C26H32F2O7Mol. Wt: 494.53

Fluocinonide Cream USP, 0.05% contains fluocinonide 0.5 mg/g in a specially formulated cream base consisting of citric acid, glycerin, 1,2,6-hexanetriol, polyethylene glycol-3350, polyethylene glycol-8000, propylene glycol and stearyl alcohol. This white cream vehicle is greaseless, non-staining, anhydrous and completely water miscible. The base provides emollient and hydrophylic properties.

Fluocinonide Cream USP, 0.05% (Emulsified Base) contains fluocinonide 0.5 mg/g in a water-washable aqueous emollient base of cetyl alcohol, citric acid (anhydrous), mineral oil, polysorbate 60, propylene glycol, purified water, sorbitan monostearate, stearyl alcohol and white petrolatum.

Fluocinonide Gel USP, 0.05% contains fluocinonide 0.5 mg/g in a specially formulated gel base consisting of carbomer 940, edetate disodium, propyl gallate, propylene glycol, sodium hydroxide (to adjust pH) and purified water. This clear, colorless, thixotropic vehicle is greaseless, non-staining and completely water miscible.

Fluocinonide Ointment USP, 0.05% contains fluocinonide 0.5 mg/g in a specially formulated ointment base consisting of glyceryl monostearate, propylene carbonate, propylene glycol, white petrolatum and white wax. It provides the occlusive and emollient effects desirable in an ointment.

In the Fluocinonide Cream USP, 0.05%, Fluocinonide Gel USP, 0.05%, and Fluocinonide Ointment USP, 0.05% formulations, the active ingredient is totally in solution.

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 (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.

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