¿What is Isoniazid?

Isoniazid is an antibiotic. It prevents tuberculous bacteria from multiplying in the body. Isoniazid is used to treat and to prevent tuberculosis (TB). Isoniazid may also be used for purposes other than those listed in this medication guide.

¿What is the most important information I should know about Isoniazid?

Take all of the Isoniazid that has been prescribed for you even if you begin to feel better. Your symptoms may begin to improve before the infection is completely treated. Avoid alcohol while taking Isoniazid. Alcohol may increase the risk of damage to the liver during Isoniazid treatment. Contact your doctor immediately if you experience numbness or tingling in the hands or feet, weakness, fatigue, loss of appetite, nausea and vomiting, yellowing of the skin or eyes, or darkening of the urine.