CLASS I A (lengthen AP)
(Na+ channel blockers)
Q uinidine ( Torsades de pointes , cinchonism)
P rocainamide (lupus like syndrome)
D isopyroamide
A miodarone
CLASS I B (shorten AP)
(acute ventricular arrhythmias)
L idocaine
M exiletine
O cainide
P henytoin
CLASS I C (no effect on AP)
F lecainide
E ncainide
P ropafenone
CLASS II (decrease CAMP, calcium channels)
P ropranolol (wheezing)
A tenolol
M etoprolol
T Imolol
E smolol
CLASS III (potassium channel blockers)
B retylium
A miodarone (PFTs, LFTs, TFTs)
S etalol (tosade de pointes)
I butilide
CLASS IV (calcium channel blockers)
*prevent nodal arrhythmias, SVT
V erapamil (flushing, edema)
D iltiazem
