Isoniazid glucuronate is a less toxic derivative the antibacterial drug isoniazid. Isoniazid is recommended for all forms of tuberculosis in which organisms are susceptible. Isoniazid itself is a prodrug and must be activated by bacterial catalase. Isoniazid inhibits InhA, the enoyl reductase from Mycobacterium tuberculosis, by forming a covalent adduct with the NAD cofactor.