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Lack of effect of lithium on the renal response to DA1-dopamine receptor stimulation by fenoldopam in normal man.

1. The effect of oral lithium (300 mg) on the renal response to the selective DA1-dopamine receptor agonist fenoldopam was investigated in seven normal men. Lithium had no influence on sodium excretion and renal haemodynamics during fenoldopam infusion. The fenoldopam-induced rise in PRA was enhanced in the presence of lithium. We conclude that a previously described interaction between lithium and the dopamine agonist gludopa is not mediated by DA1-dopamine receptors or is confined to higher doses of lithium.