Primidone (Mysoline) Side Effects

Possible side effects of primidone are listed below. Call your doctor for medical advice if these side effects are severe or persistent.

• Fatigue
• Dizziness
• Poor coordination
• Balance problems
• Nausea
• Vomiting
• Decreased appetite
• Vision problems, such as double vision
• Abnormal eye movements
• Sexual dysfunction

Rarely, primidone can cause more serious problems. Tell your doctor right away or seek emergency medical attention if you develop the following symptoms:

• Serious skin reactions (skin rash, hives, itching, blistering, peeling skin)
• Chest pain
• Trouble breathing
• Extreme tiredness or weakness
• Irregular heartbeat
• Lower back pain or flank pain

The above list may not include all the potential side effects of primidone. Contact your healthcare provider if your side effects are unusual or severe or do not get better over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Primidone (Mysoline) Overdose: In case of an overdose of primidone, call your doctor right away. You can also call your local poison control center or the national poison control center at 1-800-222-1222. Call 911 or emergency services if a person has collapsed, cannot breathe, has had a seizure, or cannot be awakened.

Source: FDA