Alpha blocker

Alpha blockers (or adrenergic alpha-antagonists) are agents that act as antagonists of alpha adrenergic receptors.^[1]

Classification

• Alpha-1 blockers - act at alpha-1 adrenergic receptors
• Alpha-2 blockers - act at alpha-2 adrenergic receptors

When the term "alpha blocker" is used without further qualification, it sometimes refers to alpha-1 blockers, and sometimes refers to agents that act at both types of receptors.

Non-selective alpha adrenergic blockers include:

   * Phenoxybenzamine
   * Phentolamine 

The agents carvedilol and labetalol are alpha blockers and beta blockers.

Uses

Alpha blockers can be used in the treatment of several conditions, such as scleroderma.^[2]

References

v • d • e Receptor agonists, antagonists, and reuptake inhibitors BA/M 5-HT (serotonin) receptor Serotonin receptor agonist (5-HT4) · Serotonin antagonist (5-HT3) · Serotonin uptake inhibitor (SSRI) Dopamine receptor Dopamine agonist · Dopamine antagonist · Dopamine reuptake inhibitor Adrenergic receptor Adrenergic agonist (Alpha, Beta 1/2) · Adrenergic antagonist (Alpha 1/2, Beta) · Adrenergic uptake inhibitor Histamine receptor Histamine agonist · Histamine antagonist (H1, H2, H3) AA GABA receptor GABA agonist · GABA antagonist Glutamate receptor NMDA receptor (NMDA receptor antagonist) · AMPA receptor (Ampakine) · Excitatory amino acid agonist · Excitatory amino acid antagonist ANS Acetylcholine receptor Cholinergic (Muscarinic, Nicotinic) · Anticholinergic (Muscarinic, Nicotinic/Ganglionic blocker/Neuromuscular-blocking drugs) · Acetylcholinesterase inhibitor Adrenergic receptor (SANS only—see above for details) PANS Parasympathomimetic (Cholinergic, Acetylcholinesterase inhibitor) · Parasympatholytic (Anticholinergic, Ganglionic blocker) SANS Sympathomimetic (Adrenergic agonist, Monoamine oxidase inhibitor) · Sympatholytic (Adrenergic antagonist, Alpha blocker, Ganglionic blocker)

v • d • e Adrenergic antagonists α α1 selective Doxazosin · Prazosin · Alfuzosin · Terazosin · Indoramin · Urapidil · Trimazosin · Moxisylyte · 1A (Tamsulosin, Silodosin) α2 selective Atipamezole · Efaroxan · Idazoxan · Yohimbine · Benzylpiperazine · Rauwolscine · Mirtazapine Non-selective α reversible (Phentolamine) · irreversible (Phenoxybenzamine) Ungrouped Tolazoline β β1 selective (cardioselective) Atenolol · Celiprolol · Betaxolol · Bisoprolol · Esmolol · Metoprolol · Nebivolol · intrinsic sympatheticomimetic activity (Acebutolol) β2 selective Butaxamine · ICI 118551 β3 selective SR 59230A Non-selective β Alprenolol · Amosulalol · Bupranolol · Metipranolol · Nadolol · Oxprenolol · Penbutolol · Propranolol · Tertatolol · Timolol · Tilisolol · Sotalol · intrinsic sympatheticomimetic activity (Pindolol) Mixed α1/β Carvedilol · Labetalol · Arotinolol Indirect tyrosine hydroxylase inhibitor (Metirosine) · vesicle storage inhibitor (Reserpine) · neurotransmitter release blocker (Guanethidine, Bretylium)

v • d • e Urologicals (G04) Acidifiers Ammonium chloride · Calcium chloride Urinary antispasmodics (primarily antimuscarinics) Darifenacin · Emepronium · Fesoterodine · Flavoxate · Imidafenacin · Meladrazine · Oxybutynin · Propiverine · Solifenacin · Terodiline · Tolterodine · Trospium For erectile dysfunction Prostaglandins (E) Alprostadil PDE5 inhibitors Avanafil · Sildenafil · Tadalafil · Udenafil · Vardenafil Alpha blockers Moxisylyte · Phentolamine · Yohimbine Others Apomorphine · Papaverine Other urologicals Acetohydroxamic acid · Collagen · Dimethyl sulfoxide · Magnesium hydroxide · Pentosan polysulfate · Phenazopyridine · Phenyl salicylate · Succinimide For BPH 5α-reductase inhibitors Dutasteride · Finasteride Alpha blockers (α1) Alfuzosin · Doxazosin · Silodosin · Tamsulosin · Terazosin Herbals Pygeum africanum · Serenoa repens

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