The diagnosis and treatment of premenstrual syndrome (PMS) has advanced sig
nificantly in the past decade, in particular, for premenstrual dysphoric di
sorder (PDD), a severe form of PMS with strict diagnostic criteria. Althoug
h the underlying pathophysiology remains unclear, increasing evidence suppo
rts an alteration in sensitivity of central nervous system neurotransmitter
s, particularly serotonergic transmitters, to fluctuating levels of ovarian
sex steroids. Successful therapy for PDD is achieved with serotonergically
active drugs, such as the selective serotonin reuptake inhibitors. Increas
ed attention is being placed on intermittent luteal phase administration of
these drugs.