beta blocker

beta blocker
= beta-adrenergic blocker
a drug that prevents stimulation of the beta adrenoceptors at the nerve endings of the sympathetic nervous system. Blockade of β1 receptors causes a decrease in heart rate and force; blockade of β2 receptors causes constriction of the airways and the arteries. Beta blockers include acebutolol, atenolol, bisoprolol, oxprenolol, propranolol, and sotalol; they are used to control abnormal heart rhythms, to treat angina, and to reduce high blood pressure (although they are no longer regarded by some experts as the first choice of drug for treating hypertension in the absence of heart disease, being less effective than newer antihypertensive drugs). Beta blockers that block both β1 and β2 receptor sites cause constriction of air passages in the lungs, and these drugs should not be used in patients with asthma and bronchospasm. Other beta blockers are relatively selective for the heart (cardioselective) and are less likely to constrict the airways. Some beta blockers (e.g. carteolol, levobunolol, and timolol) reduce the production of aqueous humour and therefore the pressure inside the eye; they are taken as eye drops in the treatment of glaucoma.

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  • Beta blocker — Beta blockers Drug class Skeletal formula of propranolol, the first clinically successful beta blocker ATC code C07 …   Wikipedia

  • beta blocker — beta blocking, adj. Pharm. any of various substances that interfere with the action of the beta receptors: used primarily to reduce the heart rate or force in the prevention, management, or treatment of angina, hypertension, or arrythmias. Also,… …   Universalium

  • beta blocker — n. any of a class of drugs used to control heartbeat, relieve angina pectoris, treat hypertension, etc. by blocking the nerve impulses that normally excite the beta receptors …   English World dictionary

  • beta blocker — ► NOUN ▪ a drug which prevents increased cardiac action, used to treat angina and reduce high blood pressure …   English terms dictionary

  • Beta-Blocker — Betablocker (Syn.: Beta Rezeptorenblocker, Beta Adrenozeptorenblocker, β Blocker) ist in der Medizin ein Sammelbegriff für eine Reihe ähnlich wirkender Arzneistoffe, die im Körper an β Rezeptoren als inverse Agonisten wirken und so die Wirkung… …   Deutsch Wikipedia

  • Beta Blocker — Betablocker (Syn.: Beta Rezeptorenblocker, Beta Adrenozeptorenblocker, β Blocker) ist in der Medizin ein Sammelbegriff für eine Reihe ähnlich wirkender Arzneistoffe, die im Körper an β Rezeptoren als inverse Agonisten wirken und so die Wirkung… …   Deutsch Wikipedia

  • beta blocker — noun any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta adrenergic receptors of the autonomic nervous system • Syn: ↑beta blocking agent, ↑beta adrenergic blocker,… …   Useful english dictionary

  • Beta blocker — A class of drugs that block beta adrenergic substances such as adrenaline (epinephrine), a key agent in the sympathetic portion of the autonomic (involuntary) nervous system. By blocking the action of the sympathetic nervous system on the heart,… …   Medical dictionary

  • beta-blocker — ˈ ̷ ̷  ̷ ̷ ˈ ̷ ̷  ̷ ̷ noun : any of a group of drugs (as propranolol) that combine with and block the activity of a beta receptor so as to decrease the heart rate and force of contractions and to lower high blood pressure and that are used… …   Useful english dictionary

  • beta-blocker — UK [ˈbiːtə ˌblɒkə(r)] / US [ˈbeɪtə ˌblɒkər] / US [ˈbɪtə ˌblɑkər] noun [countable] Word forms beta blocker : singular beta blocker plural beta blockers medical a drug that makes your heart work more slowly, used for treating high blood pressure …   English dictionary

  • beta blocker — [[t]bi͟ːtə blɒkə(r), AM be͟ɪtə [/t]] beta blockers N COUNT A beta blocker is a drug which is used to treat people who have high blood pressure or heart problems …   English dictionary

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