Antimicrobial bacteriostatic agent,
sulfanilamide. The mechanism of action is associated with competitive antagonism with PABA and inhibition of dihydropteroate synthetase, which leads to a disruption in the synthesis of dihydrofolic acid and, ultimately, its active metabolite, tetrahydrofolic acid, necessary for the synthesis of purines and pyrimidines.
It is active against Gram-positive and Gram-negative cocci, Escherichia coli, Vibrio cholerae, Clostridium perfingens, Bacillus antracis, Corinebacterium diphteriae, Yersinia pestis, Chlamydia spp., Actinomyces israelii, Toxoplasma gondii.