Some people have thoughts about suicide while taking primidone. Stay alert to changes in your mood or symptoms. Report any new or worsening symptoms to your doctor.
Do not stop using primidone suddenly, even if you feel fine. Stopping suddenly may cause increased seizures.
Before taking this medicine
You should not use  primidone if you are allergic to primidone or phenobarbital, or if you have:
porphyria (a genetic enzyme disorder that causes symptoms affecting the skin or nervous system).
Tell your doctor if you have ever had:
depression;
a mood disorder; or
suicidal thoughts or actions.
Some people have thoughts about suicide while taking primidone. Your doctor will need to check your progress at regular visits. Your family or other caregivers should also be alert to changes in your mood or symptoms.
Do not start or stop taking seizure medication during pregnancy without your doctor's advice. Having a seizure during pregnancy could harm both mother and baby. Tell your doctor right away if you become pregnant.
If you are pregnant, your name may be listed on a pregnancy registry to track the effects of primidone on the baby. Be sure to tell the doctor who delivers your baby about your primidone use. Both you and the baby may need to receive medications to prevent excessive bleeding during delivery and just after birth.
Stop breast-feeding if you notice unusual drowsiness in the nursing baby. Talk with your doctor about how best to feed your baby while taking primidone.
