Effects of danazol on the pituitary-gonadal axis in male gerbils and mice

Reversible inhibition of spermatogenesis by danazol with combination of testosterone enanthate in rabbit

Danazol (15 mg/kg b.w./day; oral) with combination of testosterone enanthate (5 mg/kg b.w./15 days; S.C.) was tested in male rabbits for reversible suppression of spermatogenesis. Semen analyses for efficacy and reversibility were performed biweekly. The regimen resulted in complete azoospermia or severe oligozoospermia in all the animals within 75 days of treatment accompanied with decreased motility, vitality and increased sperm abnormalities. Semen volume and pH did not alter significantly. Libido was unaffected. All seminal characteristics were within normal range after 115 days of recovery. In conclusion, the drug combination in given dose regimen resulted in reversible inhibition of spermatogenesis in rabbits.

Radioimmunoassay for danazol in human and monkey plasma

A sensitive method is described for the radioimmunoassay of danazol in monkey and human plasma. Antiserum was developed in rabbits, and a second antibody was used to separate bound from free danazol. The radioimmunoassay was specific for danazol, and the limit of detection ranged from 1.4 to 2.8 ng/ml. Exogeneous danazol could be quantitated accurately in both monkey and human plasma. The radioimmunoassay results agreed with values obtained by inverse isotope dilution after intravenous administration of 14C-danazol to monkeys. The assay was used successfully to measure danazol in plasma from human volunteers receiving 200 mg of danazol.