Tell your doctor your medical history, especially about: liver disease, lung disease, kidney disease, porphyria (a blood disorder), any allergies. Use caution when drinking alcoholic beverages because it may add to the drowsiness effect caused by mysoline. Use caution performing tasks requiring alertness such as driving or using machinery because this drug often causes drowsiness. This drug is not recommended for use during pregnancy. Consult your doctor before using this drug. This drug is excreted into breast milk, although its effects on a nursing infant are unknown. Consult your doctor before you breast-feed.

May cause drowsiness or sleepiness. Other side effects include stomach upset, loss of appetite, clumsiness, or fatigue. If any of these effects persist or worsen, notify your doctor. Notify your doctor if the following effects occur: seizures, double vision, fever, sore throat, skin rash. In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.

Do not allow anyone else to take this medication. Lab tests may be done, especially in the first few months, to check if the drug is working properly.