The answer is that taking tizanidine and tramadol together can lead to serious and even deadly side effects, including but not limited to: slowed or stopped breathing, excessive sleepiness, dizziness, and low blood pressure
doi: 10.1073/pnas.94.26.14942
Virtually all cells are stained and the receptors are membrane bound
doi:[10.1111/dom.15728] Heather J Leidy, Peter M Clifton, Arne Astrup, Thomas P Wycherley, Margriet S Westerterp-Plantenga, Natalie D Luscombe-Marsh, Stephen C Woods, Richard D Mattes, The role of protein in weight loss and maintenance234, The American Journal of Clinical Nutrition, Volume 101, Issue 6, 2015, Pages 1320S-1329S,ISSN 0002-9165, Institute of Medicine
And I've had people-- their lives are transformed, their mobility, their fertility