A round pill with "M" on one side and 751 on the other?

Pill imprint M 751 has been identified as Cyclobenzaprine hydrochloride 10 mg.

Cyclobenzaprine is used in the treatment of muscle spasm; sciatica; migraine; fibromyalgia; temporomandibular joint disorder and belongs to the drug class skeletal muscle relaxants. There is no proven risk in humans during pregnancy.

Cyclobenzaprine 10 mg is not subject to the Controlled Substances Act.

You could view the pill on: https://www.drugs.com/imprints/m-751-6513.html

Take care, please!