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Metoprolol, sold under the brand name Lopressor among others, is a medication used to treat angina 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] It is a selective β 1 receptor blocker ...
They work by inhibiting the synthesis, release, or reuptake of the neurotransmitters or by antagonising the receptors on postsynaptic neurones. Their medical uses, mechanisms of action, adverse effects, and contraindications depend on the specific types of adrenergic blockers used, including alpha 1, alpha 2, beta 1, and beta 2.
Side effects, caution & contraindications Remarks Beta-blockers: Metoprolol; Atenolol; Bisoprolol; Block beta-1 receptors in the heart → stop the effects of catecholamines on the heart→ reduce heart rate, heart contractility and conduction velocity → reduce the workload of the heart [15] Side effects [16] Bradycardia; Hypotension; Heart Block
Therefore, blocking β 2-adrenoceptors lowers plasma glucose. β 1-blockers have fewer metabolic side effects in diabetic patients; however, the fast heart rate that serves as a warning sign for insulin-induced low blood sugar may be masked, resulting in hypoglycemia unawareness. This is termed beta blocker-induced hypoglycemia unawareness ...
However, the serotonin receptor antagonism has side effects such as weight gain and impaired movement. [11] Hence, alpha-2 blockers are not used clinically due to its extensive binding. Similar to the alpha-1 blocker, the alpha-2 family will also present the first-dose effect , but it is generally less pronounced compared with the alpha-1 blockers.
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.
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Nadolol is used to treat hypertension and for long-term treatment of angina pectoris and is approved by the FDA for these purposes. [8]It is regularly used off-label [8] for control of heart rate in people with atrial fibrillation, [9] prevention of migraine headaches; [10] prevention of bleeding veins in people with portal hypertension caused by cirrhosis; [4] and to treat people with high ...