Details About Overdose or Poisoning Generic Salt :: Phentolamine Phentolamine Drug Pharmacology :: I. Pharmacology. Phentolamineis a competitive presynaptic and postsynaptic alpha-adrenergic receptorblocker that produces peripheral vasodilation. By acting on both venousand arterial vessels, it decreases total peripheral resistance andvenous return. It also may stimulate beta-adrenergic receptors, causingcardiac stimulation. Phentolamine has a...
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