This brown, round pill imprinted with MP 8 is a Imipramine Hydrochloride 25 MG Oral Tablet, per the NIH.
Imipramine Hydrochloride is a human prescription drug. The active pharmaceutical ingredient is imipramine hydrochloride and is classified as, "Tricyclic Antidepressant [EPC]."
This pill is made by a total of 3 firms: (1) Mutual Pharmaceutical Company, Inc., (2) REMEDYREPACK INC. , and (3) Richmond Pharmaceuticals, Inc.
There are 3 other brown pills that with a similar imprint: "MP 8". They may be a different dosage of the same drug or a different drug entirely.