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Labetalol is a beta blocker, or an antagonist of the β-adrenergic receptors. It is specifically a non-selective antagonist of the β 1-and β 2-adrenergic receptors. [17] Labetalol has intrinsic sympathomimetic activity. [17] It is also an antagonist of the α 1-adrenergic receptor, and hence is additionally an alpha blocker.
The choice between the drugs is to a large degree determined by the characteristics of the patient being prescribed for, the drugs' side effects, and cost. Most drugs have other uses; sometimes the presence of other symptoms can warrant the use of one particular antihypertensive. Examples include: Age can affect the choice of medications.
The mixed alpha-and beta blocker labetalol is especially useful for treatment of concomitant tachycardia and hypertension induced by methamphetamine. [51] The phenomenon of "unopposed alpha stimulation" has not been reported with the use of beta blockers for treatment of methamphetamine toxicity. [ 51 ]
While some studies suggest that there are minimal differences in side effects between asthma patients and non-asthma patients, beta 1 blockers are generally avoided in patients with asthma or chronic obstructive pulmonary disease due to their potential to block beta 2 receptors, particularly at high doses. [4] Presentations of asthma
The progress in β-blocker development led to the introduction of drugs with variety of properties. β-blockers were developed having a relative selectivity for cardiac β1-receptors (for example metoprolol and atenolol), partial adrenergic agonist activity , concomitant α-adrenergic blocking activity (for example labetalol and carvedilol) and ...
Metoprolol, sold under the brand name Lopressor among others, is a medication used to treat angina, high blood pressure and a number of conditions involving an abnormally fast heart rate. [4] It is also used to prevent further heart problems after myocardial infarction and to prevent headaches in those with migraines . [ 4 ]
Labetalol (has additional α-blocking activity) Nadolol; Penbutolol (has intrinsic sympathomimetic activity) Pindolol (has intrinsic sympathomimetic activity) Propranolol; Sotalol; Timolol; β 1-selective agents Acebutolol (has intrinsic sympathomimetic activity) Atenolol; Betaxolol; Bisoprolol; Celiprolol; Esmolol; Metoprolol; Nebivolol; β 2 ...
An adrenergic agonist is a drug that stimulates a response from the adrenergic receptors.The five main categories of adrenergic receptors are: α 1, α 2, β 1, β 2, and β 3, although there are more subtypes, and agonists vary in specificity between these receptors, and may be classified respectively.