Absorption: well absorbed
Distribution: sulfadiazine is distributed into most body tissues; appears to cross cell membranes freely; at a plasma concentration of 100 mcg/mL
Protein Bound: approximately 32-56%
Elimination: largely in urine; urinary concentrations usually are 10-25 times those attained in serum
Mechanism of Action
Exerts bacteriostatic action through competitive antagonism with para-aminobenzoic acid (PABA). Microorganisms that require exogenous folic acid and do not synthesize folic acid are not susceptible to the action of sulfonamides