Like all medicines, this medication may cause some possible side effects but not everyone experiences them. Consult your healthcare professional if any of the side effects lasts more than a few days or become severe or bothersome.
The common side effects of Phenobarbitone include:
If the following serious side effects happen, you should consult your healthcare professional immediately:
In rare cases, this medication may cause the following changes to a person's mental condition, especially in the first few weeks of treatment or during dose changes:
Please inform your doctor as soon as possible, or for your family or caregiver to inform your doctor if you are unable to seek treatment on your own.
Do not stop taking this medication on your own without discussing with your doctor.
It is important to note that your doctor has prescribed this medication as he/she feels you will benefit more from taking this medication over the possible side effects that it may cause, which have a low chance of occurring. Most people take this medication without any such problems.
The symptoms of a drug allergy include one or more of the following:
If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.
Inform your healthcare professional if you have the following medical conditions before starting on Phenobarbitone:
For women: Tell your doctor if you are pregnant and/or breastfeeding, your doctor would have discussed the potential benefits and side effects with continuing/starting this medication but should you have further questions or concerns, do consult your doctor.
Consult your healthcare professional immediately if your seizures get worse or become different after you start on this medication.
Be careful when driving or operating machinery as this medication may cause drowsiness.
Avoid drinking alcohol while taking this medication as it can cause excessive drowsiness.
Phenobarbitone can decrease the effectiveness of medications that prevent pregnancy. Check with your doctor about additional or other methods of birth control.