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A sympatholytic (sympathoplegic) drug is a medication that opposes the downstream effects of postganglionic nerve firing in effector organs innervated by the sympathetic nervous system (SNS). [1] They are indicated for various functions; for example, they may be used as antihypertensives .
Examples of sympathomimetic effects include increases in heart rate, force of cardiac contraction, and blood pressure. [1] The primary endogenous agonists of the sympathetic nervous system are the catecholamines (i.e., epinephrine [adrenaline], norepinephrine [noradrenaline], and dopamine ), which function as both neurotransmitters and hormones .
Sympatholytic drugs produce an opposing effect to sympathomimetic drugs. They reduce or inhibit sympathetic nervous system action. The mode of action of sympatholytic drugs includes the direct mode of blocking the activation of adrenoreceptors by receptor antagonist (blocker), and the indirect mode of inhibiting noradrenaline synthesis, storage ...
There are no known contraindication to the use of dexmedetomidine. It has a biphasic effect on blood pressure with lower readings at lower drug concentrations and higher readings at higher concentrations. [32] Common side effects include: hypotension, hypertension, with slight decreases in heart rate, arrhythmias, and hypoxia.
Trimetaphan camsilate or trimethaphan camsylate (), trade name Arfonad, is a sympatholytic drug used in rare circumstances to lower blood pressure.. Trimetaphan is a ganglionic blocker: it counteracts cholinergic transmission at a specific type of nicotinic acetylcholine receptors in the autonomic ganglia and therefore blocks both the sympathetic nervous system and the parasympathetic nervous ...
Nausea is one of the most frequently reported side effects when starting a GLP-1 medication, due to slowed-down digestion. Nausea may be related to overeating while taking these medications as well.
Guanfacine, sold under the brand name Tenex (immediate-release) and Intuniv (extended-release) among others, is an oral alpha-2a agonist medication used to treat attention deficit hyperactivity disorder (ADHD) and high blood pressure. [3] [10] Common side effects include sleepiness, constipation, and dry mouth. [10]
Additional hypotensive effects may occur when patients are taking beta-1 blockers with other antihypertensive drugs such as nitrates, PDE inhibitors, ACE inhibitors and calcium channel blockers. [17] The combination of beta blockers and antihypertensive drugs will work on different mechanism to lower blood pressure. [17]
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