**4. History**

History is very important and can be obtained from the patient, and in case the patient is comatose or cannot give his history, we may take collateral information from family, friends or medical records looking for past psychiatry illness, previous history of suicide or drugs abuse, chronic medication… History must include time, route of entry, quantity, intentional or accidental exposure, availability of drugs at home and if any member of the family has chronic diseases (hypertension, diabetic etc…), missing tablets or any empty pill bottles or other material was found around him [4].
