I was given Ultracet yesterday for pain relief from carpal and cubital tunnel. The side effects were as follows: headache, chest pain with erratic heart rate (not good as I have WPWS and take medication to regulate my heart rhythm) stomach cramps and was not able sleep. My doctor wants me to take this med for the next two weeks at which time I am to have surgery on my right arm and hand. This is a contradiction to the 5 day rule. I took 2 pills over the course of 12 hours. I won't take it again and I'm calling my doctor this morning!!!