Cyclobenzaprine (brand name: Flexeril, Amrix) belongs to a group of drugs called skeletal muscle relaxants
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10.1093/jjco/hyf035 [DOI] [PubMed] [Google Scholar] Baric M., Sever A
Saline, also called 0.9% sodium chloride solution, is a sterile saltwater solution that matches the natural salt concentration of the human body, which is why it's described as isotonic
References Achilleos, K., Petrou, C., Nicolaidou, V., & Sarigiannis, Y
Conclusion To answer the original question directly: high B12 levels themselves don't typically cause symptoms