I go too my doctors every two weeks for my pain management medication and I get urine tested. I take oxycodone 10/325, oxycontin 20mg, Adderall 20mg, flexirall, gabapentin,naproxen. I also see a weight control doctor which they give me Phentermine 37.5mgs I take that twice a day. I also have an addiction to red bull I drink it nonstop from morning till I go to bed at night. Today at my Doctor appt I seen a different doctor that Ive never seen before. He was going over my urine test results from my previous test. He asked me where I was getting Ritalin from because it showed up in my test and he said it was very dangerously high levels. He then contonues to look at all my other past tests and said they all showed Ritalin. And I can honestly say I do not take ritalin. So could you please tell me what would cause the ritalin to show up.