24Male- STUDY Pharmacology 4TH YEAR. Tonsillectomy, Adenoidectomy and Ear operations, 2XEndone 5mg every 4-6hours, no side effects, whoever reads this please bear in mind that you may experience some side effects, you may experience none. I have been taking this for the past 2 weeks. Will taper off to AVOID withdrawal effects. Those who stop quickly WILL experience side effects- it is an opioid narcotic, this is what they do with plasma levels in the blood. Be careful, these are strong AND HIGHLY ADDICTIVE, due to withdrawal. Apart from that, if you are in a large amount of pain, you SHOULDN'T have to go through it- that's why OxyCodone is there :) I hope this helps people concerned.