¿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.

¿How should I take Isoniazid?

TakeIsoniazid exactly as directed by your doctor. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you. Take each dose with a full glass (8 ounces) of water. TakeIsoniazid on an empty stomach 1 hour before or 2 hours after meals. If nausea occurs, ask your doctor if you can takeIsoniazid with food. Take all of theIsoniazid 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. It is important to takeIsoniazid regularly to get the most benefit. Your doctor may also want you to take a supplemental vitamin B6 (pyridoxine) tablet daily during treatment to prevent numbness and tingling caused by low levels of this vitamin. Your doctor may want you to have blood tests or other medical evaluations during treatment withIsoniazid to monitor progress and side effects. Store this medication at room temperature away from moisture and heat.