This white, rectangle pill imprinted with W 937 is a Famotidine 40 MG Oral Tablet, per the NIH.
Famotidine is a human prescription drug. The active pharmaceutical ingredient is famotidine and is classified as, "Histamine H2 Receptor Antagonists [MoA], Histamine-2 Receptor Antagonist [EPC]."
This pill is made by a total of 5 firms: (1) Wockhardt USA LLC., (2) Preferred Pharmaceuticals, Inc., (3) Wockhardt Limited, (4) Lake Erie Medical DBA Quality Care Products LLC, and (5) REMEDYREPACK INC.
There are 16 other white pills that with a similar imprint: "W 937". They may be a different dosage of the same drug or a different drug entirely.