GENERIC NAME: ISONIAZID - ORAL (eye-so-NYE-uh-zid)
BRAND NAME(S): Niazid
Warning | Medication Uses | How To Use | Side Effects | Precautions | Drug Interactions | Overdose | Notes | Missed Dose | Storage
WARNING: Rarely, this medication has caused severe (sometimes fatal) liver problems (e.g., hepatitis). Liver problems increase with age and with daily use of alcohol. Hepatitis can develop with use of this drug at any time during treatment. Stop using this medication and notify your doctor immediately if you develop unusual fatigue, weakness, loss of appetite, nausea, vomiting, dark urine, yellowing of the eyes or skin, or stomach or abdominal pain. Your doctor may decide to slowly restart isoniazid after these symptoms disappear and lab tests return to normal. People with active (acute) liver problems should not use this medication for preventative treatment until after the liver problems have stopped. Your doctor will monitor your liver function tests at least every month to discuss your progress.
USES: This medication is used to prevent and treat tuberculosis.
HOW TO USE: This medication is best taken on an empty stomach 1 hour before or 2 hours after meals. But it may be taken with food or milk if stomach upset occurs. Take as directed. Do not stop taking this medication without your doctor's approval. Stopping therapy early may result in ineffective treatment and the infection could recur. Vitamin B6 (pyridoxine) supplements may be prescribed in addition to this medication to prevent numbness and tingling.
SIDE EFFECTS: May cause stomach upset, heartburn, nausea or dizziness. These effects should disappear as your body adjusts to the medication. If these effects persist or become bothersome, inform your doctor. Notify your doctor if you experience: blurred vision, darkening of the urine, skin rash, yellowing of the eyes or skin, numbness or tingling of the hands or feet. In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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