o·ver·dose  (ō′vər-dōs′) :
n. An excessive dose, especially of a narcotic.
v. (ō′vər-dōs′) o·ver·dosed, o·ver·dos·ing, o·ver·dos·es
v.intr. To take an overdose.
v.tr. To administer too large a dose or too many doses to.

(Source: iuanfen)