Isoniazid Oral, Intramuscular

Isoniazid is used to treat tuberculosis (TB) or prevent its return (reactivation). It may be given alone, or in combination with other medicines, to treat TB or to prevent its return (reactivation). isoniazid may also be used for other problems as determined by your doctor.

isoniazid may cause some serious side effects, including damage to the liver. Liver damage is more likely to occur in patients over 50 years of age. You and your doctor should talk about the good isoniazid will do, as well as the risks of taking it.

If you are being treated for active tuberculosis (TB): To help clear up your TB infection completely, you must keep taking isoniazid for the full time of treatment, even if you begin to feel better. This is very important. It is also important that you do not miss any doses.

Isoniazid is available only with your doctor's prescription.