After 3 weeks of administration of 100 mg clom phene citrate daily, four idiopathic infertile men showed that the mean level of basal LH (from 18.6?0.2 IU/L to 54.7?0.6IU/L)and LH pulse frequency (from 3.5?0.1 pulses / 8h to 6.3?0.3 pulses / 8h) were significantly higher than that in control peroid (both P