Data on 194 fatal poisoning cases admitted to various hospitals in Teh
ran over a 1-y period showed an overall male:female ratio of 1.9:1, wi
th females predominating only in the 13-19 y age group. Fifty-five per
cent of the deaths were attributed to suicide, affecting more females
than males. Most cases were referred to hospitals between 1 pm and 1 a
m. There was a slight seasonal variation, with the highest number of c
ases in July and March and the lowest in April. Drugs were the most fr
equently used poison (27%) followed closely by pesticides (24%). Benzo
diazepines and tricyclic antidepressants accounted for 38%, of drug-re
lated poisonings, with diazepam (61%), imipramine (44%) and amitriptyl
ine (33%) the most commonly used agents in each group. Insecticides we
re responsible for 58% of pesticide-related deaths. Following pesticid
es, 13% of the deaths were due to chemicals, with depilator and solven
t abuse accounting for 88% of the cases in this group.