isoniazid

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isoniazid (ī´sōnī´əzĬd), drug used to treat tuberculosis. Also known as isonicotinic acid hydrazide, isoniazid is the most effective antituberculosis drug currently available. The drug inhibits or kills the tubercle bacilli that cause the disease. It is usually given together with some other antituberculosis drug such as streptomycin or para-aminosalicylic acid to prevent emergence of drug resistant organisms (see drug resistance). To prevent development of tuberculosis in individuals who have a positive reaction to a tuberculin skin test, isoniazid is given alone. Side effects are seen only with very high doses.

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isoniazid (isonicotinic acid hydrazide, INH) (I-soh-ny-ă-zid) n. a drug used in the treatment of tuberculosis, usually taken by mouth. Because tuberculosis bacteria soon become resistant to isoniazid, it is given in conjunction with other antibiotics.