Abstract
Administration of epinephrine in man has been shown previously to lead to a rise in plasma cyclic AMP levels by activation of the beta-adrenergic-stimulated adenylate cyclase. Therapeutic doses of lithium in humans block the epinephrine-induced rise in plasma cyclic AMP levels, suggesting that lithium inhibits beta-adrenergic adenylate cyclase. In contrast, ten subjects receiving haloperidol, a druh also effective in the treatment of mania, show a mean rise in plasma cyclic AMP levels after epinephrine administration and the magnitude of the response is the same as for non-drug treated individuals. These findings are discussed in relation to the possible pharmacological mechanisms of action of lithium and haloperidol in the control of mania.
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