The uses of PRONESTYL include: Procainamide is used to treat abnormal heart rhythms. It works by making your heart more resistant to abnormal activity.
Procainamide comes as a capsule and tablet to take by mouth. Immediate-acting procainamide usually is taken every 3 or 4 hours. The long-acting product is usually taken every 6 or 12 hours. Do not cut, crush, or chew extended-release (long-acting) tablets; swallow them whole. You may see a waxy core in your stool if you are taking the extended-release product; this is normal.
Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take procainamide exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Procainamide helps control your condition but will not cure it. Continue to take procainamide even if you feel well. Do not stop taking procainamide without talking to your doctor.