BETA-BLOCKERS,OTHER ANTIHYPERTENSIVES, NEUROMUSCULAR BLOCKERS, DIGITALIS, CARBAMAZEPINE POTENTIATED, QUINIDINE REDUCES BLOOD LEVEL & COMBINATION MAY RESULT IN PROFOUND CARDIAC DEPRESSION. PHENOBAB, RIFAMPICIN, PHENYTOIN INCREASE METABOLISM. POTENTIATES NEUROLOXICITY BY CARBAMAZEPINE.