Muscle Spasm
"Regarding the comment above that states Flexeril works but Amrix does not... as a pharmacist, I would like to clarify that both Flexeril and Amrix are brand names of the drug cyclobenzaprine, a muscle relaxant. Flexeril is released all at once, thus must be taken multiple times daily. Amrix is released slowly over 24 hrs, thus it is taken once daily."