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Isoniazid is an oral prescription medication used to prevent the multiplication of tuberculosis bacteria in the body. It’s important that you take the entire amount of this medicine prescribed by your health care provider to avoid a relapse of infection. Drinking alcohol during the treatment can increase the risk of developing liver damage. The following symptoms can be considered the signs of liver damage: nausea and vomiting, fatigue, weakness, yellowing of the skin (jaundice), tingling in the hands and feet, and loss of appetite. You should follow a special diet with some products being excluded to avoid interaction with isoniazid (for instance, chocolate, alcohol, caffeine, bananas, raisins, creams and some others).

Consult your doctor or dietician to learn which foods and drinks you can and must not consume when taking this medicine. You may have to take vitamins simultaneously with isoniazid as this drug can reduce the amount of vitamin B6 in your body. Before you start the treatment you need to tell your doctor about any health conditions you have or had in the past as this can have an impact on the efficiency of your treatment. Do not share isoniazid with other people.