This yellow, oval pill imprinted with M 125 is a Glyburide 3 MG Oral Tablet, per the NIH.
Glyburide is a human prescription drug. The active pharmaceutical ingredient is glyburide and is classified as, "Sulfonylurea [EPC], Sulfonylurea Compounds [Chemical/Ingredient]."
This pill is made by a total of 2 firms: (1) Mylan Pharmaceuticals Inc., and (2) PD-Rx Pharmaceuticals, Inc.
There are 2 other yellow pills that with a similar imprint: "M 125". They may be a different dosage of the same drug or a different drug entirely.