Before you begin taking a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should take this medication.
Behaviour problems: Methsuximide can cause behaviour and mood problems such as agitation, anxiety, nervousness, depression, hostility, and mood swings in people with or without a history of having these problems. Talk to your doctor as soon as possible if you experience these feelings or behaviours.
Blood disorders: Blood disorders, although infrequent, may be serious and have been reported to be associated with the use of methsuximide. Your doctor will probably recommend that you have blood tests while taking this medication.
Drowsiness/reduced alertness: Methsuximide may impair the mental or physical abilities required for potentially hazardous tasks such as driving or operating machinery. Before undertaking such activities, determine how this medication affects you.
Lupus: Cases of systemic lupus erythematosus have been reported with the use of this medication.
Kidney or liver disease: If you have liver or kidney disease you should be very closely monitored by your doctor while taking methsuximide.
Stopping medication: Do not stop taking this medication suddenly. If you need to stop taking the medication, decrease the dosage slowly as directed by your doctor.
Suicidal thoughts and behaviour: Occasionally, people taking this medication may experience thoughts of suicide. If you experience these symptoms or any other behaviour change while taking this medication, contact your doctor immediately. Family members or caregivers of people who are taking this medication should contact the person's doctor immediately if they notice unusual behaviour changes.
Pregnancy: Consult your doctor as soon as possible if you become pregnant while taking this medication. If you take methsuximide to prevent major seizures, do not stop taking it if you become pregnant. If you are taking this medication to prevent minor seizures, talk to your doctor about the risks and benefits of stopping the medication during pregnancy.
Breast-feeding: This medication passes into breast milk. If you are a breast-feeding mother and are taking methsuximide, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.