NCIt definition : A short-acting, broad-spectrum sulfonamide and a synthetic analog of para-aminobenzoic
acid (PABA) with bacteriostatic property. Sulfacytine competes with PABA for the bacterial
enzyme dihydropteroate synthase, thereby preventing the incorporation of PABA into
dihydrofolic acid, the immediate precursor of folic acid. This leads to an inhibition
of bacterial folic acid synthesis and de novo synthesis of purines and pyrimidines,
ultimately resulting in cell growth arrest and cell death.;