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Metoprolol, sold under the brand name Lopressor among others, is a medication used to treat high blood pressure, 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 ]
Beta blocker. Skeletal formula of propranolol, the first clinically successful beta blocker. Beta blockers, also spelled β-blockers, are a class of medications that are predominantly used to manage abnormal heart rhythms ( arrhythmia ), and to protect the heart from a second heart attack after a first heart attack ( secondary prevention ). [ 1]
Metaraminol is given intravenously as either a bolus (often 0.5–1 mg doses) or as an infusion, usually via peripheral intravenous access. Metaraminol is commonly available as 10 mg in 1 mL, that requires dilution prior to administration (often made up to a 0.5 mg/mL solution), however pre-prepared syringes of metaraminol for bolus use for hypotension are also commonly available.
The β-blockers are an immensely important class of drugs due to their high prevalence of use. The discovery of β-blockers reaches back to more than 100 years ago, when early investigators came up with the idea that catecholamines were binding selectively to receptor-like structures and that this was the cause of their pharmacological actions ...
Amlodipine. Amlodipine, sold under the brand name Norvasc among others, is a calcium channel blocker medication used to treat high blood pressure, coronary artery disease (CAD) [ 10] and variant angina (also called Prinzmetal angina or coronary artery vasospasm, among other names). [ 11] It is taken orally (swallowed by mouth).
Bisoprolol. Bisoprolol, sold under the brand name Zebeta among others, is a beta blocker which is selective for the beta-1 receptor [ 7] and used for cardiovascular diseases, [ 7] including tachyarrhythmias, high blood pressure, angina, and heart failure. [ 7][ 8] It is taken by mouth. [ 7]
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.
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