PLASMA LEVEL REDUCED BY PHENYTOIN, CARBAMAZEPINIE, VALPROIC ACID. FLUNARIZINE MAY ENHANCE THE SEDATIVE EFFECTS OF CNS DEPRESSANTS INCLUDING ALCOHOL, BARBITURATES, HYPNOTICS, OPIOID ANALGESICS, ANXIOLYTIC SEDATIVES, AND ANTIPSYCHOTICS. IT HAVE AN ADDITIVE ANTIMUSCARINIC ACTION WITH OTHER ANTIMUSCARINIC DRUGS SUCH TRICYCLICS AND MAOIS.