This pink, round pill imprinted with M D10 is a doxazosin (as doxazosin mesylate) 2 MG Oral Tablet, per the NIH.
Doxazosin is a human prescription drug. The active pharmaceutical ingredient is doxazosin mesylate and is classified as, "Adrenergic alpha-Antagonists [MoA], alpha-Adrenergic Blocker [EPC]."
This pill is made by a total of 7 firms: (1) Mylan Institutional Inc., (2) PD-Rx Pharmaceuticals, Inc., (3) REMEDYREPACK INC. , (4) Mylan Pharmaceuticals Inc., (5) Physicians Total Care, Inc., (6) Cardinal Health, and (7) NCS HealthCare of KY, Inc dba Vangard Labs
There are 6 other pink pills that with a similar imprint: "M D10". They may be a different dosage of the same drug or a different drug entirely.