Source:http://linkedlifedata.com/resource/umls/id/C0717316
NCI: A combination preparation containing pyrilamine, caffeine and acetaminophen. Pyrilamine is an ethylenediamine antihistamine that blocks H1 receptors and exerts local anesthetic, sedative and mild analgesic activities. Caffeine is a central nervous system stimulant. Acetaminophen possesses analgesic and antipyretic effects. This preparation is used for the relief of premenstrual and menstrual symptoms.