This blue, oval pill imprinted with Pfizer MVC300 is a Selzentry 300 MG Oral Tablet, per the NIH.
SELZENTRY is a human prescription drug. The active pharmaceutical ingredient is maraviroc and is classified as, "CCR5 Co-receptor Antagonist [EPC], Chemokine Co-receptor 5 Antagonists [MoA]."
This pill is made by a total of 3 firms: (1) ViiV Healthcare Company, (2) Physicians Total Care, Inc., and (3) Pfizer Laboratories Div Pfizer Inc.
There is 1 other blue pill that with a similar imprint: "Pfizer MVC300". They may be a different dosage of the same drug or a different drug entirely.