Do NOT use Mexitil if:

• you are allergic to any ingredient in Mexitil
• you have cardiogenic shock or second- or third-degree atrioventricular (AV) block and do not have a pacemaker.

Contact your doctor or health care provider right away if any of these apply to you.

Some medical conditions may interact with Mexitil. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have other heart problems (eg, heart block or AV block, conductions problems), congestive heart failure, or a pacemaker
• if you have low blood pressure, liver problems, or a seizure disorder.

Some medicines may interact with Mexitil. Tell your health care provider if you are taking any other medicines, especially any of the following:

• Cimetidine because the side effects of Mexitil may be increased
• Hydantoins (eg, phenytoin), phenobarbital, or rifampin because the effectiveness of Mexitil may be decreased
• Caffeine, lidocaine, or theophylline because side effects may be increased by Mexitil.

This may not be a complete list of all interactions that may occur. Ask your health care provider if Mexitil may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

Important safety information:

• Mexitil may cause dizziness, lightheadedness, or blurred vision. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to Mexitil. Using Mexitil alone, with certain other medicines, or with alcohol may lessen your ability to drive or perform other potentially dangerous tasks.
• Do not suddenly stop taking Mexitil without checking with your doctor.
• Before you have any medical or dental treatments, emergency care, or surgery, tell the doctor or dentist that you are using Mexitil.
• Lab tests, including liver and heart function, may be performed to monitor your progress or to check for side effects. Be sure to keep all doctor and lab appointments.
• Use Mexitil with extreme caution in children. Safety and effectiveness have not been confirmed.
• Pregnancy and breast-feeding: If you become pregnant while taking Mexitil, discuss with your doctor the benefits and risks of using Mexitil during pregnancy. Mexitil is excreted in breast milk. Do not breast-feed while taking Mexitil.

All medicines may cause side effects, but many people have no, or minor, side effects.

Check with your doctor if any of these most common side effects persist or become bothersome:

Blurred vision; clumsiness; constipation; diarrhea; dizziness or lightheadedness; headache; heartburn; incoordination; nausea; nervousness; stomach discomfort; tremor; vomiting.

Seek medical attention right away if any of these severe side effects occur:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blurred vision or other vision problems; chest pain; fainting; fever; irregular, fast, or slow heartbeat; severe dizziness or lightheadedness; severe stomach pain; sore throat; yellowing of the skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects.