What side effects may I notice from receiving Isoniazid?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-changes in vision or eye pain
-dark urine
-fever, sore throat
-hallucination, loss of contact with reality
-loss of appetite
-memory problems
-nausea, vomiting
-pain, tingling, numbness in the hands or feet
-redness, blistering, peeling or loosening of the skin, including inside the mouth
-seizures
-stomach pain
-unusually weak or tired
-yellowing of the eyes or skin

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-breast enlargement or tenderness
-diarrhea
-headache
-upset stomach
-trouble sleeping

This list may not describe all possible side effects for Isoniazid. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.