title: The effect of an H1 blocker, chlorpheniramine maleate, on total menstrual loss.
abstract: 50 subjects participated in a 4-month study of the effects of an antihistamine on total menstrual loss. During the first 2 periods, no drugs were given; during the last 2 periods, an antihistamine or a placebo was administered according to a double-blind format. The menstrual weights of the first 2 months were averaged and compared with averages from the last 2 months combined. The treated group showed an average decrease in menstrual loss of 11.30 g compared to a decrease of 0.98 g in the placebo group. While the difference in means was not statistically significant, the variance between the 2 groups was significant (p = 0.0002), indicating that the antihistamine, chlorpheniramine maleate, was effective in reducing menstrual loss in certain individuals, but that the effect was neither uniform nor universal.
mesh_terms: D000328:Adult; D002744:Chlorpheniramine / Q000494:pharmacology*; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005260:Female; D006634:Histamine H1 Antagonists / Q000494:pharmacology*; D006801:Humans; D008598:Menstruation / Q000187:drug effects*
chemical_list: D006634:Histamine H1 Antagonists; D002744:Chlorpheniramine