thanks to the people that replied...you've all been very helpful..the doctors in our ER like to give morphine to patients in severe pain (usu renal colic pts), and they usually order 10mg IV, that's it. since I'm new in the unit, the "older" nurses just say just give 4mg slowly then after a while 2-2-2mg. i was also wondering if a doctor ordered 30mg of morphine for a patient, would this be an overdose or still acceptable, because some say this is an overdose. i've been looking through literature about morphine and haven't encountered a certain dose considered to be an overdose. what causes the headache in these patients given morphine?