Can Or Does Ritalin 20 Mg Interact With Oxycodone 10

can or does ritalin 20 mg interact with oxycodone 10 mg. ive been on one type or another oxycodone. from 5mg upto 15mg for the better part of 5 years. for the past 2 years ive been on oxycodone 10mg. when i started them i weighed roughly 237lbs. now, i weigh 327lbs. still on the 10mgs. dosent weight, body type (build) etc effect how the low dose works in your body... can such a low dose in someone my size sho a negative in a piss test...