MECAMYLAMINE IS A GANGLION BLOCKER, INHIBITS THE TRANSMISSION OF NERVE IMPULSES IN BOTH SYMPATHETIC AND PARASYMPATHETIC GANGLIA. THE SYMPATHETIC BLOCKADE PRODUCES PERIPHERAL VASODILATION. IT ALSO HAS A DIRECT VASODILATOR EFFECT ON PERIPHERAL BLOOD VESSELS. ACTIONS STARTS AT 1/2 - 2 HRS & LASTS FOR 6 - 12 HRS OR MORE.