Final answer:
Physostigmine is a reversible acetylcholinesterase inhibitor used to treat toxic syndrome from overdose with organophosphates.
Step-by-step explanation:
Physostigmine is useful in treating toxic syndrome from overdose with organophosphates. Organophosphates are compounds that inhibit the function of the enzyme acetylcholinesterase, causing an accumulation of acetylcholine in synapses. Physostigmine acts as a reversible acetylcholinesterase inhibitor, meaning it temporarily blocks the breakdown of acetylcholine, allowing it to accumulate and counteracting the effects of the organophosphates.