Effect of probenecid on the kinetics of epsilon-aminocaproic acid

Healthy male subjects received, 1 wk apart, single oral doses of epsilon-aminocaproic acid (EACA) 100 mg/kg alone, EACA within probenecid (0.5 gm), or EACA 2 hr after 2.0 gm probenecid. Probenecid (2.0 gm) reduced the 8-hr urinary clearance and recovery of EACA by 50% without affecting plasma kinetics. Recovery of EACA in urine rose to 78% of the dose 48 hr after EACA. Plasma clearance of EACA did not differ from control EACA urinary clearance when 0.5 gm probenecid was given with EACA. In both cases all the EACA dose was recovered in urine within 8 hr.