Studies with bromocriptine

Abstract
Caffeine was administered to six patients with idiopathic parkinsonism in an attempt to potentiate the therapeutic response of bromocriptine, a dopamine (DA) receptor agonist, by inhibition of phosphodiesterase. In a double-blind study at doses of 1,000 mg daily, caffeine failed to enhance the antiparkinsonian action of bromocriptine (40 mg daily) given concomitantly. Although effective in potentiating the action of levodopa and other agonists in animal models of parkinsonism, caffeine is inactive in parkinsonism in man.

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