This blue, oval pill imprinted with M 411 is a Verapamil hydrochloride 240 MG Extended Release Tablet, per the NIH.
Verapamil Hydrochloride is a human prescription drug. The active pharmaceutical ingredient is verapamil hydrochloride and is classified as, "Calcium Channel Antagonists [MoA], Calcium Channel Blocker [EPC]."
This pill is made by a total of 4 firms: (1) Mylan Institutional Inc., (2) Mylan Pharmaceuticals Inc., (3) Physicians Total Care, Inc., and (4) Cardinal Health
There are 4 other blue pills that with a similar imprint: "M 411". They may be a different dosage of the same drug or a different drug entirely.