muscle relaxant (trade name Flexeril) used for muscle spasms or acute injury
"After my back spasm from lifting furniture, the doctor prescribed cyclobenzaprine to help me sleep through the pain."
A particular antidepressant generally prescribed as an analgesic and muscle relaxant.
"The doctor switched me from my usual cyclobenzaprine to a different medication because the antidepressant side effects were interfering with my sleep, even though it was originally prescribed just for its pain-relieving properties."