There is not always weight loss on oxycontin. That one had me fooled. My daughter actually gained 30 pounds. She told me that food tastes really good. She doesn't eat only when she is jonesing for the drug. When she is high she eats all the time. When she needs the next fix, she becomes very restless, runny nose, chills or sweating. Another thing when they are high, is the itching. Another thing to look for is nodding. That is when they are sitting and they just start to fall asleep. The bottom lip goes slack. My daughter used to tell me that she was very tired, but the nod is different than just regular falling asleep. Also their pupils will be really small, even in sunlight. Marle