The penetrance of mezlocillin, metronidazole and trimethoprim-sulfamethoxazole into the pancreatic juice of humans was measured in ten patients convalescing from acute pancreatitis at the time of endoscopic retrograde cholangiopancreatography. Therapeutic levels were obtained in the serum for all three antimicrobial agents; simultaneously aspirated nonbile stained pancreatic juice contained therapeutic levels of metronidazole and trimethoprim-sulfamethoxazole. Mezlocillin was not present in a therapeutic level in any patient with nonbile stained pancreatic fluid.
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