Mysoline is an anti-epileptic drug, also called an anticonvulsant. It is used to control seizures. Mysoline can be used alone or in combination with other seizure medications. Mysoline works by decreasing the excitability of the brain cells. This helps to prevent abnormal electrical activity from starting and keeps such activity from spreading to other parts of the brain.

Take Mysoline exactly as prescribed by your doctor. For adults and children 8 years old and older, your doctor will likely recommend that you start with a low dose and slowly increase your dose as follows: Days 1 to 3: 100 mg or 125 mg at bedtime; Days 4 to 6: 100 mg or 125 mg twice daily; Days 7 to 9: 100 mg or 125 mg three times daily; Day 10 and beyond: 250 mg three times daily. You should not take more than 2000 mg per day. For children under 8 years old, the following dose is usually recommended: Days 1 to 3: 50 mg at bedtime; Days 4 to 6: 50 mg twice daily; Days 7 to 9: 100 mg twice daily; Day 10 and beyond: 125 mg to 250 mg three times daily.

Before taking Mysoline you should talk with your doctor if you have porphyria, anemia or any other blood disorder, depression or suicidal thoughts, any allergies.

You should not take Mysoline if you are allergic to it, primidone, or any of the inactive components of the medicine, to phenobarbital, are pregnant or breastfeeding, or if you have porphyria.

Get emergency medical help if you have slurred speech, loss of balance or coordination, easy bruising or bleeding, dizziness, drowsiness, nausea, vomiting, loss of appetite, blurred vision, impotence, loss of interest in sex, hives, difficulty breathing, swelling of your face, lips, tongue. If you notice other effects not listed above, contact your doctor.

Tell your doctor about all other medications you use, especially: barbiturates (butalbital, pentobarbital, phenobarbital, amobarbital), antidepressant medications (nefazodone, vilazodone, bupropion), benzodiazepines (diazepam, lorazepam, clorazepate, triazolam), antifungal medications (fluconazole, ketoconazole, itraconazole), HIV or AIDS medications (indinavir, atazanavir, fosamprenavir, ritonavir), narcotics (codeine, morphine, oxycodone), seizure medications (carbamazepine, phenytoin). Interaction between two medications does not always mean that you must stop taking one of them. Tell your doctor or prescriber about all prescription, over-the-counter, and herbal medications you are taking.

Take the missed dose as soon as possible. Skip the missed dose if it is time for your next scheduled dose. Don't take extra medicine to make up the missed dose.

The overdose symptoms are unknown. If you think you have overdosed the medicine seek emergency medical help at once.

Store the medicine at room temperature between 59-86 degrees F (15-30 degrees C) away from light and moisture. Do not store the drugs in the bathroom. Keep all drugs away from reach of children and pets.

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