A drug overdose is the accidental or intentional use of a drug or medicine in an amount that is higher than is normally used. (source)
Overdose with opiate drugs causes sedation (sleepiness), low blood pressure, slowed heart rate, and slowed breathing. Pinpoint pupils, where the black centers of the eyes become smaller than normal, are common in opiate overdose.
Drug Overdose-
Definition
A drug overdose is the accidental or intentional use of a drug or medicine in an amount that is higher than is normally used.