Tag: Parasympathomimetics

The parasympathetic nervous system (PNS) is responsible for the body's 'rest and digest' functions, and parasympathomimetics are a class of medications that activate this system by mimicking the effects of the primary neurotransmitter, acetylcholine. Understanding what are the effects of parasympathomimetics is crucial for healthcare professionals and patients alike, as these drugs are used to treat a variety of conditions, from glaucoma to urinary retention.

The constriction of the pupil, a process known as miosis, is a vital physiological response primarily controlled by the parasympathetic nervous system. Many medications, referred to as miotics, can induce this effect by mimicking or enhancing the action of the neurotransmitter acetylcholine. This article clarifies which of the following causes the pupil to constrict (miotics).

Medications that stimulate the parasympathetic nervous system are known as parasympathomimetics or cholinergic agonists, and they act by mimicking or enhancing the effects of the neurotransmitter acetylcholine. These drugs are prescribed to treat a variety of conditions by promoting the body's 'rest and digest' functions.

The vagus nerve constitutes about 75% of the parasympathetic nervous system, playing a key role in the body's 'rest and digest' functions [1.8.4]. Understanding what medication activates the parasympathetic nervous system involves exploring drugs that mimic or enhance the primary neurotransmitter, acetylcholine [1.2.1, 1.4.4].

While newer medications have become the standard for managing glaucoma, miotics still offer a powerful mechanism for lowering intraocular pressure, particularly in specific cases. Understanding **what is the mechanism of action of miotics in glaucoma** is key to appreciating their role in ophthalmology.