Isoniazid is used to treat or prevent tuberculosis.
Take isoniazid regularly as directed with a glass of water.
Take each dose on an empty stomach - one hour before or two hours after food.
Keep taking isoniazid until the course is finished, even if you start to feel better.
Take the missed dose as soon as possible. If it is close to the time for your next dose, skip the missed dose and carry on as normal. Do not take two doses at the same time.
If you often forget to take isoniazid, your tuberculosis may not be fully treated.
Some medicines available without a prescription may react with isoniazid including:
Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.
|Side Effects||Recommended action|
Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain
Numbness or tingling of the fingers or toes
Dizziness, slurred speech, unsteadiness
|Tell your doctor immediately|
Nausea, stomach upset
|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 PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. December 2017
For more general information about this sheet annd 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 the Canterbury District Health Board. 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