How do you tell if an op 10 oxy is real. I got one from a buddy for back pain and didn't take away the pain so I took 2.5 more.. And I notice you can't chew them.. But hard to grasp I had taken that many and felt nothing.. And one of them the numbers are not lined up.. What's the numbers look like.. Are they lined the same way or is one right side up and one upside down?? How can I tell??