An antibacterial drug used mainly to treat tuberculosis. It is also used to treat leprosy and legionnaires’ disease. The drug is usually prescribed with other antibacterials because some strains of bacteria develop resistance if it is used alone. Side effects include harmless, orange-red discoloration of the urine, saliva, and other body secretions, muscle pain, nausea, vomiting, diarrhoea, jaundice, flu-like symptoms, rash, and itching. The drug interferes with the action of oral contraceptives.


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