PM includes antihistamine...in OTC dosage. Just took the edge off the pain. I learned this when I had the hands worked on...those are very VERY painful (LOTS of little nerves) and was in a cast with full elevation for 6-8 weeks (they take a tendon from your lower arm and create a new joint, so time in healing is a must). I was on narcotics for the entire time in cast...then weaned off. Learned from a very good doc that you can be more creative with meds as long as you are under the dosage. I got sick from anything I took at their dosage (gee...used to get high from Ipubrofen, so go figure??). So...instead of 2 percosets every 4-6 hours, I would take one every 3-4 hours...etc. I just used that same thought process as I got off them...reduce...see how you do...reduce more...etc. I hate the feeling of being on them, but they are a necessary evil in my mind, as long as my goal is to get off them all.