This yellow, round pill imprinted with R 717 is a 24 HR Diclofenac Sodium 100 MG Extended Release Tablet, per the NIH.
Diclofenac Sodium is a human prescription drug. The active pharmaceutical ingredient is diclofenac sodium and is classified as, "Cyclooxygenase Inhibitors [MoA], Decreased Prostaglandin Production [PE], Nonsteroidal Anti-inflammatory Compounds [Chemical/Ingredient], Nonsteroidal Anti-inflammatory Drug [EPC]."
This pill is made by Actavis Elizabeth LLC.
There are 2 other yellow pills that with a similar imprint: "R 717". They may be a different dosage of the same drug or a different drug entirely.