This yellow, round pill imprinted with 100 is a meloxicam 15 MG Oral Tablet, per the NIH.
Meloxicam is a human prescription drug. The active pharmaceutical ingredient is meloxicam and is classified as, "Cyclooxygenase Inhibitors [MoA], Nonsteroidal Anti-inflammatory Compounds [Chemical/Ingredient], Nonsteroidal Anti-inflammatory Drug [EPC]."
This pill is made by a total of 8 firms: (1) Carlsbad Technology, Inc, (2) Carlsbad Technology, Inc., (3) Medsource Pharmaceuticals, (4) REMEDYREPACK INC. , (5) Accord Healthcare Inc., (6) AvPAK, (7) Bryant Ranch Prepack, and (8) Lake Erie Medical DBA Quality Care Products LLC.
There are 5 other yellow pills that with a similar imprint: "100". They may be a different dosage of the same drug or a different drug entirely.