the seven antiarrhythmic drugs tested were procainamide ( oral [ p.o . ] and intravenous [ iv ] , class ia ) , lidocaine ( iv , class ib ) , tocainide ( p.o. , class ib ) , flecainide ( p.o . and iv , class ic ) , propranolol ( p.o . and iv , class ii ) , amiodarone ( p.o . and iv , class iii ) , and verapamil ( p.o . and iv , class ic ) , propranolol ( p.o . and iv , class ii ) , amiodarone ( p.o . and iv , class iii ) , and verapamil ( p.o . and iv , class iv ) .
C0003195
antiarrhythmic drugs
C0033216
procainamide