Final answer:
The symptoms of a cholinergic overdose include miosis, blurred vision, headache, nausea, and muscle twitching. Poisoning by a nerve agent can cause constriction of pupils, salivation, convulsions, and asphyxiation. Barbiturates overdose symptoms include sluggishness, drowsiness, and coma.
Step-by-step explanation:
The symptoms of a cholinergic overdose include miosis (pinpoint pupils), blurred or dim vision, headache, nausea, vomiting, diarrhea, copious secretions and sweating, muscle twitching or fasciculations, dyspnea, seizures, and unconsciousness.
In cases of poisoning by a nerve agent, symptoms may include constriction of pupils, profuse salivation, convulsions, involuntary urination and defecation, as well as asphyxiation or cardiac arrest.
Barbiturates overdose symptoms include sluggishness, difficulty in thinking, slowness of speech, faulty judgement, drowsiness, shallow breathing, staggering, coma, or death.