Interconversion between haloperidol and reduced haloperidol in healthy volunteers

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Abstract
The interconversion between haloperidol (HAL) and reduced haloperiodol (RHAL) was examined following their separate adminstration in low (5 mg) single oral doses to 15 young healthy male volunteers in a crossover design. Using an ultrasensitive HPLC method plasma concentrations of HAL and RHAL were monitored over a period of one week following each administration. Except in one case, both the analytes were found in the plasma of all the volunteers following each administration, thereby indicating interconversion of the two compounds. Comparison of the AUC(0-t) ratios of RHAL/HAL and HAL/RHAL following administration of HAL and RHAL, respectively, revealed that the interconversion favours the reduction of HAL to RHAL. The disposition of HAL following administration of RHAL appears to be limited by its rate of formation and the disposition of RHAL following administration of HAL, on the other hand, is much slower than that of the parent compound.

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