Temporal Relationships Between the Pharmacokinetics of Methylphenidate in the Human Brain and Its Behavioral and Cardiovascular Effects

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 1996 Jan 1

PMID 8741951

Citations 17

Authors

N D Volkow

G J Wang

S J Gatley

J S Fowler

Y S Ding

J Logan

R Hitzemann

B Angrist

J Lieberman

Affiliations

Soon will be listed here.

Abstract

Positron emission tomography was used to compare the pharmacokinetics of [11C]methylphenidate in the human brain with the temporal course of the subjective and cardiovascular effects observed after intravenous methylphenidate (0.5 mg/kg). Four subjects were tested twice with [11C]methylphenidate, at baseline and after methylphenidate. All subjects showed almost identical uptake of 11C labeled drug in brain, as well as a very similar decrease in binding of [11C]methylphenidate in basal ganglia, after pretreatment with methylphenidate. In contrast, the magnitude of the behavioral and cardiovascular changes induced by methylphenidate varied among the subjects. The temporal course for methylphenidate effects paralleled closely the pharmacokinetics of [11C]methylphenidate in brain for the perception of "restlessness" and for changes in systolic blood pressure and heart rate. In contrast, methylphenidate induced "high", "anxiety" and changes in diastolic blood pressure decreased rapidly despite long lasting binding of the drug in brain. These results indicate that binding of methylphenidate in brain does not appear to predict individual responses to the drug and that more than one neurotransmitter and/or adaptation process are likely to be involved in the behavioral and cardiovascular effects of methylphenidate.

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