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Isoniazid
Pronounced eye-so-NY-ah-zid
Brand names: INH
Type: Antitubercular (TB medicine) · All Antibiotics & Infection Medicines
What Isoniazid is used for
- Treating tuberculosis, combined with other TB medicines
- Preventing tuberculosis in people with latent infection
Common side effects
- Nausea
- Tiredness
- Numbness or tingling in hands and feet
Important cautions
- Can injure the liver — report yellowing skin, dark urine, or unusual tiredness, and avoid alcohol
- Vitamin B6 is often given with it to protect the nerves
How it comes
Tablets, liquid, injection (hospital). This guide lists forms only — it never lists strengths or doses.
Toxicity lists: Isoniazid also appears on Medicines That Can Harm the Liver.
Related medicines — Antibiotics & Infection Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.