ISSN:
1432-1041
Keywords:
Amphetamine
;
drug dependence
;
pharmacokinetics
;
amphetamine psychosis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Summary Eighteen subjects with amphetamine psychosis were studied with respect to fluid balance, intensity and duration of psychotic symptoms, urinary and plasma amphetamine levels and the relative amounts of unchanged drug and metabolites in urine. On admission to hospital about half of the psychotic patients were dehydrated, the water lack being up to 6.7% of total body weight. The dehydrated subjects had lower renal clearances of amphetamine because of lower rates of urine production. As noted previously there was a strongly positive correlation between urinary pH and the half life (T 1/2) of plasma amphetamine, with an increase inT 1/2 of about 7 h for every unit increase in urinary pH. Patients with alkaline urine had intense psychoses lasting for about 4 1/2 days after the last dose of amphetamine. In patiens with acid urine, the psychotic symptoms were milder, and of about 2 days duration. No correlation was found between the degree of psychosis in different subjects and the plasma levels of the drug. — The ratio between the amounts of labelled metabolites and unchanged drug excreted in urine rose for each day after administration of3H-amphetamine, implying a slower excretion rate for the metabolites than for the parent drug. The relative proportion of metabolites was higher in patients with an alkaline urine, being more than 90% after the first day. — When amphetamine (200 mg i.v.) was given to nonpsychotic, dependent subjects, the peak plasma levels (mean 423 ng/ml) exceeded the highest levels observed during the first day in psychotic patients. However, no psychotic symptoms were observed in these subjects. The volumes of distribution calculated from the monoexponential elimination curves were higher than those previously reported in nondependent subjects. — With an alkaline urine a group of nonpsychotic amphetamine-dependent subjects had significantly longer plasmaT 1/2 (p〈0.05) than a group of drug-naive control subjects. The results suggest that increased tissue binding may be a component in tolerance to amphetamine in dependent humans.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00560284
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