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Phenobarbitone

Drug Class: Commonly Known As: Category:
Anticonvulsant Children

Phenobarbitone - Side Effects, Precautions, and Contraindications

What side effects can Phenobarbitone cause?

Generally, the common side effects tend to occur at the beginning of treatment. Such side effects may include:

  • Drowsiness, dizziness, and headache, tiredness. Be careful when you are administering over-the-counter medicines. Medicines for cold and allergy may add on to the drowsiness. Be sure to supervise your child when he/she is involved in activities such as cycling or swimming.
  • Behaviour changes such as excitement, restlessness, depression and vivid nightmares.
  • Nausea, vomiting, upset stomach and constipation. If the medication upsets the stomach, take it with food but do not take it with carbonated drinks.
  • Poor muscle coordination, insomnia, hallucinations (see and hear things that do not exist)

Inform your doctor if any of the above side effects lasts for more than a few days or if they become serious or bothersome.

Rare but serious effects may sometimes occur. Contact your doctor as soon as possible if you notice any of the following:

  • Yellowing of the skin or eyes
  • Severe skin rash, itchy or peeling skin
  • Unusual bruises or bleeding
  • Prolonged fever, sore throat, mouth sores
  • Breathing difficulties

Inform your doctor if you notice any other unusual symptoms. Always discuss with your doctor or pharmacist if you or your child has any problems or difficulties during or after taking phenobarbitone.


Before taking Phenobarbitone, what precautions must I follow?

What food or medicine must I avoid when I take Phenobarbitone?

  • Updated on Wednesday, October 4, 2017
  • Article contributed by Pharmacy Department KK Women's and Children's Hospital

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