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.
What should I discuss with my healthcare provider before taking methsuximide?
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.
How should I take methsuximide?
Take this medication exactly as it was prescribed for you. Do not take the medication in larger
amounts, or take it for longer than recommended by your doctor. Follow the directions on your
prescription label.
Methsuximide can cause a decrease in many types of blood cells (white cells, red cells,
platelets). This can make it easier for you to bleed from an injury or get sick from being around others
who are ill. Call your doctor at once if you have any unusual bleeding, weakness, or any signs of
infection, including flu-like symptoms. These symptoms may first develop even after you have been
using the medication for several months.
To be sure your blood cells do not get too low, your blood may need to be tested on a regular
basis while taking methsuximide. Your kidney and liver function may also need to be tested. Do not
miss any scheduled appointments.
Do not stop taking methsuximide without first talking to your doctor, even if you feel better.
You may have increased seizures if you stop taking methsuximide suddenly. You will need to use less
and less before you stop the medication completely.
Contact your doctor if your seizures get worse or you have them more often while taking
methsuximide.
Carry an ID card or wear a medical alert bracelet stating that you are taking methsuximide,
in case of emergency. Any doctor, dentist, or emergency medical care provider who treats you should
know that you are taking a seizure medication.
It is important to use methsuximide regularly to get the most benefit. Get your prescription
refilled before you run out of medicine completely.
Store methsuximide at room temperature away from moisture and heat. High heat can
cause a methsuximide capsule to melt.
What happens if I miss a dose of methsuximide?
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.
Where can I get more information about methsuximide?
Your pharmacist has information about methsuximide written for health professionals that you may read.
What are the possible side effects of methsuximide?
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.
What is the most important information I should know about methsuximide?
Methsuximide can cause a decrease in many types of blood cells (white cells, red cells,
platelets). Call your doctor at once if you have any unusual bleeding, weakness, or any signs of
infection, even if these symptoms first occur after you have been using the medication for several
months.
Methsuximide may also cause liver damage. Call your doctor if you have symptoms such as
loss of appetite, stomach pain, or jaundice (yellowing of the skin or eyes).
You may have thoughts about suicide while taking this medication. Your doctor will need to
check you at regular visits. Do not miss any scheduled appointments.
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.
Do not stop taking methsuximide without first talking to your doctor, even if you feel better.
You may have increased seizures if you stop taking methsuximide suddenly. You will need to use less
and less before you stop the medication completely.
Contact your doctor if your seizures get worse or you have them more often while taking
methsuximide.
Carry an ID card or wear a medical alert bracelet stating that you are taking methsuximide,
in case of emergency. Any doctor, dentist, or emergency medical care provider who treats you should
know that you are taking a seizure medication.
What should I avoid while taking methsuximide?
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.
What other drugs will affect methsuximide?
Before taking methsuximide, tell your doctor about all other seizure medications you use,
especially:
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.
What happens if I have an overdose of methsuximide?