Sympatholytics
Sympatholytics
Sympatholytics (pronounced sim-puh-tho-LIT-iks) are a class of drugs that inhibit the postganglionic functioning of the sympathetic nervous system (SNS). They are also known as antiadrenergic agents or adrenergic antagonists.
Etymology
The term "sympatholytic" is derived from the Greek words "sympatheia" meaning "sympathy" and "lysis" meaning "loosening or dissolving". It refers to the drug's ability to 'dissolve' or inhibit the effects of the sympathetic nervous system.
Function
Sympatholytics work by blocking the action of catecholamines, such as norepinephrine and epinephrine, on the sympathetic nervous system. They are used to treat a variety of conditions, including hypertension, anxiety disorders, and glaucoma.
Types of Sympatholytics
There are several types of sympatholytics, including:
- Alpha blockers, which inhibit the action of norepinephrine on alpha receptors.
- Beta blockers, which inhibit the action of epinephrine and norepinephrine on beta receptors.
- Ganglionic blockers, which inhibit the transmission of nerve impulses in the autonomic ganglia.
Related Terms
- Sympathomimetics: These are drugs that mimic the effects of the sympathetic nervous system.
- Parasympatholytics: These are drugs that inhibit the action of the parasympathetic nervous system.
- Parasympathomimetics: These are drugs that mimic the effects of the parasympathetic nervous system.
External links
- Medical encyclopedia article on Sympatholytics
- Wikipedia's article - Sympatholytics
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