Patent ID: 7608607

Claim:
A method for maintaining a therapeutically effective concentration of testosterone in the blood serum of a male for treating hypogonadism which comprises transdermally delivering to the male by applying to the skin a composition which is in the form of a topical gel, which has a viscosity of about 500 to about 20,000 cps and a pH of about 3 to about 9, and comprises: (A) about 0.1 to about 5 wt. % of testosterone; (B) about 0.5 to about 15 wt. % of oxacyclohexadecan-2-one; (C) about 0.1 to about 10 wt. % of a thickening agent; (D) a mixture of solvents which include: (i) about 60 to about 75 wt. % of ethanol or isopropanol; and (ii) propylene glycol and glycerin as co-solvents.