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Isoniazid is an antibiotic. It prevents tuberculous bacteria from multiplying in the body. Isoniazid is used to treat and to prevent tuberculosis (TB). Isoniazid may also be used for purposes other than those listed in this medication guide.Isoniazid is a drug primarily used in the treatment of tuberculosis. Isoniazid is usually employed alongside other drugs in the treatment of this condition. Isoniazid works by inhibiting the synthesis of mycolic acid, a necessary component of the cell wall of the bacteria that causes TB. Isoniazid can be administered orally, intramuscularly or intravenously.
