Published in Women's Health Weekly, August 23rd, 2001
Studies in rhesus macaque monkeys show that that one drug - ZK 137 316 - can, depending on dose, allow ovulation but block menstruation, while the other - ZK 230 211 - blocks both ovulation and menstruation. Of great importance, both drugs block the effects of estrogen on the lining of the uterus, thus preventing the potentially dangerous build-up of endometrial cells caused by the action of unopposed estrogen ("Reversible suppression of menstruation with progesterone antagonists in rhesus...
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