www.drugs.com/medical-answers/long-flexeril-work-3573677/
...-2918(03)80067- Malanga GA, Ruoff GE, Weil AJ, Altman CA, Xie F, Borenstein DG. Cyclobenzaprine ER for muscle spasm associated with low back and neck pain: two randomized, double-blind, placebo-controlled studies of identical design. Curr Med Res Opin. 2009 May;25(5):1179-96. doi: 10.1185...