Urine pH and phencyclidine excretion.

Subeffective doses (0.5 mg) of 3H-phencyclidine (PCP) were given intravenously to three healthy men under two regimens designed to alkalinize or acidify their urine (oral sodium bicarbonate or ammonium chloride). The concentrations of PCP and its metabolites in saliva, plasma, and urine for 7 hr after injection were determined by high-performance liquid radiochromatography. A sample of perspiration from one subject was analyzed. The effects of physical exercise on the plasma concentration and urinary excretion of PCP were also studied. Multiple linear regression analysis showed the logarithm of renal clearance the renal clearance of PCP. PCP and its metabolites are also excreted in perspiration. Our results support clinical reports of the importance of vigorous acidification of urine and diuresis in treatment of PCP intoxication.