Cyclobenzaprine
"I'm a 34 year-old male, work out regularly & was prescribed cyclobenzaprine for back pain related to a pulled muscle. Was used in conjunction with physical therapy and the drug helped me get sleep and function during the day by mitigating pain and spasms. Side effects: Severe constipation. Constipation persisted for over a week after I stopped taking the drug. Had to see a Doctor about it. I highly suggest taking laxatives while taking this medicine. Also made me very drowsy. Experienced dry mouth when taking at night before bed as well."