NCIt definition : A broad-spectrum sulfanilamide and a synthetic analog of para-aminobenzoic acid (PABA)
with bacteriostatic and antimalarial properties. Sulfadoxine 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 parasitic folic acid synthesis and de novo synthesis of purines
and pyrimidines, ultimately resulting in cell growth arrest and cell death.;