Premenstrual syndrome (PMS), manifested by recurrent emotional and somatic symptoms that interfere with normal activities, occurs in the greatest severity during the late luteal phase, a week prior to the onset of menses. 1,2 A smaller part of women experiences more severe premenstrual symptoms classified as premenstrual dysphoric disorder (PMDD). The symptoms improve or disappear few days after the onset of menses, during spontaneous or hormonal contraception suppressed anovulatory cycles, in pregnancy, and