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The Excretion of Caffeine in the Semen of Men: Pharmacokinetics and Comparison of the Concentrations in Blood and Semen
Author(s) -
BEACH CYNTHIA A.,
BIANCHINE JOSEPH R.,
GERBER NICHOLAS
Publication year - 1984
Publication title -
the journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 116
eISSN - 1552-4604
pISSN - 0091-2700
DOI - 10.1002/j.1552-4604.1984.tb02774.x
Subject(s) - caffeine , semen , pharmacokinetics , chemistry , excretion , urine , volume of distribution , endocrinology , medicine , andrology , biochemistry
The concentration of caffeine in the blood and semen of men was measured after an oral dose of 200 or 400 mg caffeine. Caffeine was rapidly absorbed (mean t max = 0.76 ± 0.12 hour), with an average maximum concentration in the blood of 7.4 μg/ml for the 400‐mg dose and 3.4 μg/ml for the 200‐mg dose. The mean clearance of caffeine was 161 and 156 ml/min, while the mean volume of distribution was 50 and 47 liters for the 400‐ and 200‐mg doses, respectively. Distribution of caffeine into the semen was rapid, with a concentration of caffeine in the semen almost identical to that observed concurrently in the blood (blood/semen concentration ratio = 0.97). The mean half‐life of caffeine in the blood and semen was 3.7 and 3.6 hours, respectively, indicating that the decline of caffeine in the blood is very similar to that in semen. Thus, caffeine partitions rapidly into and out of the prostatic and seminal vesicular secretions, which contribute to the formation of the ejaculate.