Alpha-2 blockers (or α2 blockers) are a subset of the alpha blocker class of drugs and are antagonists to the α2 adrenergic receptor. They are mainly used in research, having found limited clinical application in human medicine. Increases the noradrenaline release due to blockade of alpha-2 receptors.
Yohimbine, historically used as an aphrodisiac, is sometimes used in veterinary medicine (although now largely replaced by atipamezole) for reversing the effects of α2s such as medetomidine that are used as sedatives during surgery.
Withdrawal from α2 blockers can be difficult or dangerous as the global downregulation of neurotransmitters may cause symptoms of depression and other neurological problems, and increased blood sugar levels together with decreased insulin sensitivity can cause diabetes. Moreover, reduced microcirculation together with adrenaline supersensitivity in organs such as liver can occur.
- Lemke, KA (June 2004). "Perioperative use of selective alpha-2 agonists and antagonists in small animals". The Canadian Veterinary Journal. 45 (6): 475–80. PMC 548630. PMID 15283516.
- Haapalinna A, Leino T, Heinonen E (November 2003). "The alpha 2-adrenoceptor antagonist atipamezole potentiates anti-Parkinsonian effects and can reduce the adverse cardiovascular effects of dopaminergic drugs in rats". Naunyn Schmiedebergs Arch. Pharmacol. 368 (5): 342–51. doi:10.1007/s00210-003-0827-z. PMID 14566451.
- Chopin P, Colpaert FC, Marien M (February 1999). "Effects of alpha-2 adrenoceptor agonists and antagonists on circling behavior in rats with unilateral 6-hydroxydopamine lesions of the nigrostriatal pathway". J. Pharmacol. Exp. Ther. 288 (2): 798–804. PMID 9918591.
- Media related to Alpha-2 blockers at Wikimedia Commons
|This antihypertensive-related article is a stub. You can help Wikipedia by expanding it.|