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G. L. FOSS, V. R. TINDALL, and J. P. BIRKETT

Summary.

In a double-blind clinical trial, 114 subfertile men were given courses of clomiphene citrate (100 mg daily for three 10-day periods in successive months) and of placebo tablets of identical appearance. There were no consistent changes in sperm density. No serious adverse reactions to clomiphene were seen. Further studies are recommended on the efficacy of clomiphene in doses of 25 to 50 mg daily for periods of 60 to 90 days.

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J. S. Shindler, Kathleen Haworth, Audrey Axon, W. G. Bardsley, V. R. Tindall, and I. Laing

Summary. Fourteen healthy women were screened for the following parameters throughout one complete menstrual cycle: levels of urinary oestrogens and pregnanediol; levels of plasma and urinary gonadotrophins; and pH, protein content and levels of peroxidase in the cervical mucus. It was found that concentrations of peroxidase in the cervical mucus were not a reliable index of ovulation.