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Isoniazid Tablets

Generic name: Isoniazid Tablets [ eye-soe-NYE-a-zid ]
Drug class: Hydrazide derivatives

Medically reviewed by Drugs.com. Last updated on Apr 24, 2024.

Warning

  • Very bad and sometimes deadly liver problems have happened with this medicine (isoniazid tablets). Call your doctor right away if you have signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
  • The chance of liver problems is higher the older you are. The chance may also be raised by drinking alcohol every day, long-term liver problems, or injection drug use. The chance of liver problems may also be raised in women, mainly women who are black or Hispanic or who have just had a baby. Most of the time, liver problems caused by this medicine (isoniazid tablets) happen within the first 3 months of care, but they can happen at any time. Most of the time, liver function has gone back to normal but sometimes it has not. Blood work will need to be done before starting this drug and while taking it. If you have questions, talk with the doctor.
  • If you have active liver disease, talk with your doctor. This medicine may not be right for you.

Uses of Isoniazid Tablets:

What do I need to tell my doctor BEFORE I take Isoniazid Tablets?

This is not a list of all drugs or health problems that interact with this medicine (isoniazid tablets).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this medicine (isoniazid tablets) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Isoniazid Tablets?

How is this medicine (Isoniazid Tablets) best taken?

Use this medicine (isoniazid tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

What do I do if I miss a dose?

ciprofloxacin, levofloxacin, Levaquin, rifampin, isoniazid, pyrazinamide, rifabutin, rifapentine, bcg, Rifadin

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

What are some other side effects of Isoniazid Tablets?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Isoniazid Tablets?

Consumer Information Use and Disclaimer

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.