A couple of years back, I separated my left should pretty bad. Doc in the ER called in a Class 2+. Class 3 is where they start talking surgical repair due to impaired function. Anyways, he wrote me a script for 10 Tylenol 3 (codeine) pills, and said that should be plenty to get me through the rough days when sleeping hurts. Surprised me he didn't write a bigger script, in a good way. Still have 8 of the pills in my medical supply cabinet.