Clobetasol Propionate Foam, 0.05%, is a white thermolabile hydroethanolic aerosol foam containing the active ingredient, clobetasol propionate, USP, a synthetic corticosteroid, for topical use. Clobetasol, an analog of prednisolone, has a high degree of glucocorticoid activity and a slight degree of mineralocorticoid activity.
Clobetasol propionate, USP is 21-chloro-9-fluoro-11ß,17-dihydroxy-16ß-methylpregna-1,4-diene-3,20-dione 17-propionate, with the molecular formula C25H32CIFO5, a molecular weight of 466.97 g/mol.
The following is the chemical structure:
Y:\regulatory Affairs\_launch Readiness\14-clobetasol Propionate Foam, 0.05% (olux)\structure.jpg (Structure)
Clobetasol propionate, USP is a white to almost white crystalline powder, practically insoluble in water, slightly soluble in benzene and diethyl ether; sparingly soluble in ethanol; freely soluble in acetone, in dimethylsulfoxide, in chloroform, in methanol and in dioxane.
Each gram of Clobetasol Propionate Foam, 0.05% contains 0.5 mg clobetasol propionate, USP. The foam also contains cetyl alcohol, citric acid, ethanol (60%), polysorbate 60, potassium citrate, propylene glycol, purified water, and stearyl alcohol pressurized with a hydrocarbon (propane/butane) propellant.