I have been taking Norco for 3-4 months at 2 a day. Then I had knee replacement and was on Percocet at 8-10 a day for 3 weeks. I am now back to the Norco for 3-4 weeks at 3-4 a day and working on getting down to 2-3 a day. I have had constipation, trouble urinating, dry mouth, but mainly shakiness. I shake so bad sometimes it affects my eating and writing. This feels like it comes from my core, hard to explain. Is this a side effect of using these meds for too long? I am going to my surgeon on March 19, for a follow up. Is 6 months considered long term use of these drugs and will the symptoms go away when I get off of them, I am really needing one more refill of 50 pills to get me through the pain, tho it is getting better daily.