Phenobarbital is used to treat and prevent seizures.
Take phenobarbital regularly as directed. You can take it with or without food.
Tablet: Take with a glass of water.
Liquid: Measure carefully with an oral syringe or measuring spoon.
Take the missed dose as soon as possible and continue as directed.
Phenobarbital can react with many medicines, sometimes with severe results.
Remember to tell your pharmacist or doctor you are taking phenobarbital before starting any other medicines or treatments, including over-the-counter medicines, vitamins, herbal products or recreational drugs.
|Side Effects||Recommended action|
Skin rash, skin peeling or blisters
|Stop taking and see your doctor immediately|
Slow or shallow breathing, hard to wake up
Reduced number of blood cells that fight infections or help your blood to clot - symptoms include: fever, chills, sore throat or generally feeling unwell, or easy or unusual bruising or bleeding
Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain
|Tell your doctor immediately|
Loss of co-ordination/walking or handwriting problems
Confusion, trouble concentrating
Unusual behaviour or thinking, mood changes, agitation
|Tell your doctor|
|Tell your doctor if troublesome|
If you notice any other effects, discuss them with your doctor or pharmacist.
This leaflet contains important, but not all, information about this medicine.
Prepared by the MyMedicines Committee at Christchurch Hospital, Te Whatu Ora - Waitaha, New Zealand. March 2023
For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?
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My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.
For more information about the sheets, see: What does a My Medicines sheet cover?
My Medicines is developed by a team at Te Whatu Ora – Waitaha. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed