Isoniazid (Oral Route, Intramuscular Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common
  • Clumsiness or unsteadiness
  • Dark urine
  • Loss of appetite
  • Nausea or vomiting
  • Numbness, tingling, burning, or pain in hands and feet
  • Unusual tiredness or weakness
  • Yellow eyes or skin
Rare
  • Blurred vision or loss of vision, with or without eye pain
  • Convulsions (seizures)
  • Fever and sore throat
  • Joint pain
  • Mental depression
  • Mood or other mental changes
  • Skin rash
  • Unusual bleeding or bruising

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common
  • Diarrhea
  • Stomach pain
For injection form
  • Irritation at the place of injection

Dark urine and yellowing of the eyes or skin (signs of liver problems) are more likely to occur in patients over 50 years of age.

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

Precautions
DR600815 Portions of this document last updated: May 1, 2012

Source: Drug Information provided by: Micromedex

Copyright © 2013 Thomson Healthcare Inc. All rights reserved. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.

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