Medical Definition of clofazimine
: a reddish brown powdered dye C27H22Cl2N4 that is a derivative of phenazine used especially to treat lepromatous leprosy Dapsone and clofazimine are weakly bactericidal for M leprae but, in combination, will kill 99.999% of bacilli (the limit of detectability) within 3 months.—Robert R. Jacobson and James L. Krahenbuhl, The Lancet, 20 Feb. 1999
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