Replacement estrogen therapy for menopausal vasomotor flushes. Comparison of quinestrol and conjugated estrogens

Quinestrol, conjugated estrogens, or placebo was used to treat 156 patients with pernicious vasomotor instability in a prospective, double blind, randomized, multiinvestigator trial. Vasomotor flushes were severe in approximately 80% of the cases and moderate in 20%, relatively equally distributed among the various drug groups. Both quinestrol and conjugated estrogens were significantly more effective than placebo in relieving vasomotor symptoms (by χ² analysis, P ≤ 0.05). Greatest improvement was seen in the group receiving the higher once weekly quinestrol dosage of 0.2 mg followed by the group on the lower quinestrol dosage of 0.1 mg once weekly and the group on conjugated estrogens, 1.25 mg daily for 21 days and 7 days off. No significant difference in relief of vasomotor flushes was shown between the active drug groups. No drug related complications or side reactions of significance occurred. The results indicate that once weekly quinestrol is effective in relieving the vasomotor symptoms of the menopause. Either of two once weekly quinestrol regimens is as effective as conjugated estrogens given daily in a cyclic manner and therefore offers an alternative form of exogenous estrogen therapy.