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What are the side effects of isoniazid?

Mild side effects of isonizid may include: diarrhea; upset stomach; vision trouble. Immediate medical help is needed if any of these less common, serious side effects occur: signs of liver damage, including brown or dark yellow urine, yellowed eyes or skin, vomiting, upset stomach, no appetite or feeling overly tired or weak; signs of a serious allergic reaction, including itching, rash, hives, a tight feeling in the chest, trouble breathing or swollen tongue, lips, mouth or face; signs of low vitamin B6, including a red or sore mouth, cracked corners of the mouth, a scaly rash or feeling irritable or confused; pain or tenderness in the stomach; feeling unusually thirsty or frequent urination; eye pain; painful or swollen joints; tingling or numb hands and feet; fever or chills; sore throat or swollen glands; unusual bruises or bleeding; trouble with memory; mood or mental changes; and seizures.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.