What is methsuximide?
Methsuximide is an anti-epileptic medication, also called an anticonvulsant.
Methsuximide is used alone or in combination with other medications to treat absence seizures (also called "petit mal” seizures) in adults and children.
Methsuximide may also be used for other purposes not listed in this medication guide.
You should not use this medication if you are allergic to methsuximide or to other seizure medications.
If you have lupus, liver disease, or kidney disease, you may need a dose adjustment or special tests to safely take methsuximide.
You may have thoughts about suicide while taking this medication. Tell your doctor if you have new or worsening depression or suicidal thoughts during the first several months of treatment, or whenever your dose is changed.
Your family or other caregivers should also be alert to changes in your mood or symptoms. Your doctor will need to check you at regular visits. Do not miss any scheduled appointments.
FDA pregnancy category C. It is not known whether methsuximide is harmful to an unborn baby. Before taking this medication, tell your doctor if you are pregnant or plan to become pregnant during treatment.
Your name may need to be listed on a pregnancy registry if you use seizure medication during pregnancy. The purpose of this registry is to track the outcome of the pregnancy and delivery to evaluate whether the medication had any effect on the baby.
It is not known whether methsuximide passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.
Methsuximide can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.
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Seek emergency medical attention if you think you have used too much of this medicine.
Overdose symptoms may include nausea, vomiting, extreme drowsiness, and weak or shallow breathing.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.
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Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any new or worsening symptoms such as: mood or behavior changes, depression, anxiety, or if you feel agitated, hostile, restless, hyperactive (mentally or physically), or have thoughts about suicide or hurting yourself.
Call your doctor at once if you have any of these serious side effects:
- signs of infection such as fever, chills, sore throat, flu symptoms, easy bruising or bleeding (nosebleeds, bleeding gums), mouth sores, unusual weakness;
- nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
- joint pain or swelling with fever, swollen glands, muscle aches, chest pain;
- patchy skin color, red spots, or a butterfly-shaped skin rash over your cheeks and nose (worsens in sunlight);
- fever, sore throat, and headache with a severe blistering, peeling, and red skin rash; or
- worsening of seizures.
Less serious side effects may include:
- diarrhea, constipation;
- hiccups, vomiting, weight loss;
- dizziness, drowsiness, nervousness, confusion;
- blurred vision;
- sleep problems (insomnia); or
- lack of balance or coordination.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
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Before taking methsuximide, tell your doctor about all other seizure medications you use, especially:
- phenobarbital (Luminal, Solfoton); or
- phenytoin (Dilantin).
This list is not complete and there may be other drugs that can interact with methsuximide. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.
Celontin and methsuximide
Available Strengths & Dosages
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