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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Effects of isradipine, a dihydropyridine-class calcium channel antagonist, on D-methamphetamine-induced cognitive and physiological changes in humans.

D-methamphetamine is abused for its euphoric effects and stimulatory action on cognitive function. Its abuse can, however, be associated with massive hypertension resulting in strokes, ruptured aneurysms, or myocardial infarction. We examined the utility of isradipine, a dihydropyridine-class calcium channel antagonist, in treating d-methamphetamine induced hypertension and evaluated its effects on cognitive function, both of which are mediated by dopaminergic mechanisms. D-methamphetamine dose-dependently increased all vital signs (systolic, diastolic, and mean arterial pressure, and pulse rate) parameters. Isradipine significantly reduced d-methamphetamine-induced increases in diastolic and mean arterial pressure; however, this potentially beneficial therapeutic effect was offset by a significant reflex rise in pulse rate. D-methamphetamine also improved attention, accuracy of reasoning ability, and performance on computerized cognitive function tasks. D-methamphetamine's cognitive improving effects were not altered significantly by isradipine. Isradipine increased the false responding rate but was without significant effect on any other attentional task, or on reasoning ability, or performance. Isradipine does not appear to enhance cognitive function in healthy humans.[1]

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