Pharmacokinetic Properties of Testosterone Propionate in Norman Men

Abstract
The pharmacokinetic characteristics of testosterone propionate were studied in normal men after a single im dose of 25 mg testosterone propionate-19,i9,19-d3; Plasma levels of testosterone propionate-19,19,19-d3, its active metabolite testosterone-i9,19,19-d3, and endogenous testosterone were measured by gas chromatography-mass spectrometry. Testosterone propionate-19,19,l9-d3 was gradually transferred from the im injection site to the systemic circulation. The plasma levels of testosterone propionate-19,l9,19-d3 were maintained at 2–4 ng/ ml between 3 and 36 h after administration. Plasma testosterone-i9,19,19-d3 levels were maintained above the physiological testosterone level for 48 h, while plasma levels of endogenous testosterone changed little.

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