This orange, oval pill imprinted with GS XJG is a Tykerb 250 MG Oral Tablet, per the NIH.
TYKERB is a human prescription drug. The active pharmaceutical ingredient is lapatinib ditosylate and is classified as, "Kinase Inhibitor [EPC], Protein Kinase Inhibitors [MoA]."
This pill is made by GlaxoSmithKline LLC.
There are 3 other orange pills that with a similar imprint: "GS XJG". They may be a different dosage of the same drug or a different drug entirely.