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This medicine is a Class 1C anti-arrhythmic medicine used to treat an irregular heartbeat and to help maintain a normal heart rhythm in patients without structural heart disease.

SIDE EFFECTS, that may go away during treatment, include dizziness or lightheadedness, drowsiness, constipation, gas, tiredness, muscle weakness, or change in taste. If they continue or are bothersome, check with your doctor. CONTACT YOUR DOCTOR IMMEDIATELY if you experience chest pain, unusual bruising or bleeding, irregular heartbeat, fast or slow heartbeat, shortness of breath, fever, sore throat, chills, unexplained weakness, or blurred vision. AN ALLERGIC REACTION to this medicine is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash, itching, swelling, dizziness, or trouble breathing. If you notice other effects not listed above, contact your doctor, nurse, or pharmacist.