A small white pill with an m on one side and a 2 on the other what is it?

The small white pill with an "M" on one side and a "2" on the other is identified as Metoprolol Succinate 25 mg, which is a medication commonly used to treat high blood pressure, heart failure, and other heart-related conditions. It is important to use this medication under the guidance of a healthcare professional. If you have found this pill and are unsure of its use, consult a pharmacist or doctor for more information.