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SPECIFIC PROPERTIES OF ATROPINE SULFATE IN THE HUMAN BODY
Axmedov Shamshod Jamshidovich
Faculty of Medicine, International University of Asia, Uzbekistan.
https://doi.org/10.5281/zenodo.15693395
Abstract.
Atropine sulfate is a widely used anticholinergic drug that affects the
parasympathetic nervous system by blocking muscarinic receptors. This article reviews its
pharmacological properties, mechanism of action, and its specific physiological effects on
various systems of the human div.
Keywords:
Atropine sulfate, belladonna, bradyarrhythmia, muscarinic receptors.
Introduction
Atropine sulfate is a tropane alkaloid extracted from plants of the Solanaceae family,
such as Atropa belladonna. It is commonly used in medicine for its antimuscarinic properties. By
competitively inhibiting acetylcholine at muscarinic receptors, atropine sulfate influences several
organ systems, making it an essential drug in anesthesia, cardiology, and toxicology.
Pharmacological Properties
Atropine sulfate is a tertiary amine, which allows it to cross the blood-brain barrier. It is
well absorbed from the gastrointestinal tract and mucous membranes. After administration, it is
distributed throughout the div and metabolized in the liver. Its half-life ranges from 2 to 4
hours in adults.
Mechanism of Action
Atropine sulfate works by blocking the action of acetylcholine on muscarinic receptors in
the parasympathetic nervous system. There are five subtypes of muscarinic receptors (M1–M5),
and atropine has a non-selective action on all of them. The result is reduced parasympathetic
tone, leading to a variety of physiological effects.
Specific Effects on the Body
1. Cardiovascular System
At low doses, atropine may cause temporary bradycardia due to central vagal stimulation.
However, at therapeutic doses, it increases heart rate by inhibiting vagal tone. It is used to
treat bradyarrhythmias and in cardiac arrest protocols.
2. Respiratory System
Atropine reduces secretions in the airways, making it useful before surgery to prevent
aspiration. It also causes bronchodilation, which is beneficial in some obstructive pulmonary
conditions.
3. Ocular System
Topical application of atropine dilates the pupils (mydriasis) and paralyzes the ciliary
muscle (cycloplegia), which is useful in ophthalmologic examinations but may cause blurred
vision and photophobia.
4. Gastrointestinal System
Atropine decreases gastrointestinal motility and secretion. It is sometimes used to treat
irritable bowel syndrome and other hypermotility disorders.
5. Urinary System
It causes relaxation of the smooth muscles in the urinary bladder, which may lead to
urinary retention, especially in elderly patients.
6. Central Nervous System
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In high doses, atropine can cross the blood-brain barrier and cause CNS effects such as
restlessness, hallucinations, and, in toxic doses, coma. These effects are more prominent in
children and the elderly.
Clinical Uses
Pre-anesthetic medication
Treatment of bradycardia
Antidote for organophosphate poisoning
Management of peptic ulcers (historically)
Ophthalmologic examinations
Conclusion
Atropine sulfate plays a critical role in modern medicine due to its broad range of actions
on the muscarinic receptors throughout the div. Understanding its specific physiological effects
is essential for safe and effective clinical use.
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