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To characterize the poisoning cases admitted to the Loghman-Hakim Hospital Poison Center (a teaching reference hospital of poisoning) in Tehran, Iran. All admitted acutely poisoned patients from January to December 2003 were evaluated retrospectively. Information of sociodemographic characteristics, agents and cause of poisoning, and the mortality rate were collected from medical records of the hospital. During this period, 24 179 cases were referred to the emergency department that 10 206 of them were admitted. Of the admitted cases, 51% were male and 49% female. The majority (38%) of cases were in the age range of 21-30 years. Most (79%) of poisonings were intentional and 21% were unintentional. The most important agents of acute poisoning were drugs (69.13%) especially sedative-hypnotics followed by opioids (12.34%) and pesticides especially organophosphates (OPs) (6.21%). The mortality rate was 1.3% (318 patients). Death was mostly occurred by opioids (41.54%), followed by drugs (28%) and pesticides especially OPs (12%). The prevention and treatment of poisoning due to opioids, pesticides specially OPs and sedative-hypnotics drugs should merit high priority in the health care of the indigenous population of Tehran. [ABSTRACT FROM AUTHOR]