hello, i relocated and i have chronic pain and have been taking TWO TYPES WHICH ARE 60mg oxycontin ER, AND THE OXYCODONE HCL 3O MG. HE DIDN T REFILL THE 60 MG MEDS , AND HE CUT THE AMOUNT IN HALF OF MY OXYCODONE HCL , DOWN TO 20 MG I REFILLED THE 20 MG AND NOTICED IT LOOK DIFFERENT THAN THE 20 MG. THAT I WAS TAKING FOR A FEW YEARS , THESE ARE ROUND AND GRAY AND IMPRINTED ON ONE SIDE IS N P THE OTHER HAS 14 , ARE THESE GENERIC ? THEY ARE MANUFACTURED BY ZYDUS PHARMACEUTICALS . I VE HAD SEVERE HEADACHES FROM THESE.