| Class Ia antiarrhythmic agent |
| Quinidine |
| Quinidine (BAN) |
| Quinidine gluconate (USP) <US> |
| Quinidine polygalacturonate |
| Quinidine sulfate (USP); Quinidine sulfate hydrate (JP18) <JP/US> |
| Quinidine phenylethylbarbiturate |
| Procainamide |
| Procainamide (INN) |
| Procainamide hydrochloride (JP18/USP) <JP/US> |
| Disopyramide |
| Disopyramide (JP18/USAN/INN) <JP> |
| Disopyramide phosphate (JAN/USP) <JP/US> |
| Sparteine |
| Sparteine (INN) |
| Sparteine sulfate (JAN/USAN) |
| Ajmaline (JP18) |
| Lorajmine hydrochloride (USAN) |
| Hydroquinidine |
| Hydroquinidine (DCF) |
| Hydroquinidine hydrochloride |
| Cibenzoline |
| Cifenline (USAN); Cibenzoline (INN) |
| Cifenline succinate (USAN); Cibenzoline succinate (JP18) <JP> |
| Pirmenol |
| Pirmenol (INN) |
| Pirmenol hydrochloride hydrate (JAN) <JP> |
| Pirmenol hydrochloride (USAN) |
| Class Ib antiarrhythmic agent |
| Lidocaine |
| Lidocaine (JP18/USP/INN) <JP/US> |
| Lidocaine hydrochloride (JAN/USP) <JP/US> |
| Lidocaine hydrochloride monohydrate <JP/US> |
| Mexiletine |
| Mexiletine (INN) |
| Mexiletine hydrochloride (JP18/USP) <JP/US> |
| Tocainide |
| Tocainide (USAN/INN) |
| Tocainide hydrochloride (USP) |
| Aprindine |
| Aprindine (USAN/INN) |
| Aprindine hydrochloride (JP18/USAN) <JP> |
| Class Ic antiarrhythmic agent |
| Propafenone |
| Propafenone (INN) |
| Propafenone hydrochloride (JP18/USP) <JP/US> |
| Flecainide |
| Flecainide (INN) |
| Flecainide acetate (JP18/USP) <JP/US> |
| Lorcainide |
| Lorcainide (INN) |
| Lorcainide hydrochloride (USAN) |
| Encainide |
| Encainide (INN) |
| Encainide hydrochloride (USAN) |
| Ethacizine |
| Pilsicainide |
| Pilsicainide (INN) |
| Pilsicainide hydrochloride hydrate (JP18) <JP> |
