What symptom is NOT commonly associated with organophosphate poisoning?

Pupillary constriction, or miosis, is not commonly associated with organophosphate poisoning, which typically causes pupils to constrict. Organophosphates are a class of chemicals often found in pesticides and nerve agents that inhibit acetylcholinesterase, leading to an accumulation of acetylcholine. This accumulation results in overstimulation of the muscarinic receptors, which produce symptoms such as salivation, lacrimation, urination, diarrhea, gastrointestinal distress, and bradycardia rather than tachycardia.

While tachycardia can occur due to various reflex mechanisms in compensating for the bradycardia initiated by excessive acetylcholine activity, vomiting and diarrhea are direct results of the enhanced parasympathetic activity caused by organophosphate toxicity. In summary, while organophosphate poisoning does lead to various gastrointestinal and autonomic symptoms, pupillary constriction is not one of them; instead, it is typically characterized by pupil constriction.