The white round pill marked MP 52 is identified as Prednisone (10 mg), manufactured by Mutual Pharmaceutical Company, Inc.
National Drug Code: 53489-0139 (Discontinued)
Prednisone is a synthetic corticosteroid drug that is particularly effective as an immunosuppressant, and affects virtually all of the immune system. It is used to treat certain inflammatory diseases and (at higher doses) cancers, but has significant adverse effects.