Atropine is widely used in medicine for its ability to block acetylcholine receptors in the parasympathetic nervous system. It is commonly administered to treat bradycardia (slow heart rate), increasing heart rate and improving cardiac output during emergencies such as cardiac arrest or severe hypotension. In anesthesia, atropine is used to prevent or manage excessive secretions in the airway and to reduce vagal reflexes during surgical procedures. It is also a key antidote in poisoning from organophosphate compounds, including insecticides and nerve agents, as it counteracts the overstimulation of parasympathetic nerves. Additionally, atropine is used in ophthalmology to dilate the pupils (mydriasis) and paralyze the ciliary muscle (cycloplegia), aiding in eye examinations and treating conditions like uveitis. Due to its systemic effects, it is administered with caution, typically via injection, oral, or ophthalmic routes depending on the clinical need.