An unknown patient presents with pyrexia, constricted pupils, hypotension, cyanosis and stupor progressing to coma. Poisoning is due to -
Among the given four options, only Phenobarbitone (Barbiturate) can cause constricted pupils.
All the given symptoms can occur in barbiturates (phenobarbitone) poisoning.
Phenobarbitone
Cannabis
Dhatura
Diphenhydramine