The pill you have found is
TRILEPTAL 150 MG (generic name
oxcarbazepine ) which is used most commonly to treat seizures.
Described as Film-Coated Tablets: yellow, ovaloid, slightly biconvex, scored on both sides. Imprinted with T/D on one side and C/G on the other side.
You will find a picture at the bottom of the PDR page at
http://www.drugs.com/PDR/Trileptal_Tablets.html
Info at
http://trileptal.drugs.com