aspirin
Of course you can. RNY patients are typically advised against taking NSAIDS, including aspirin, though. You'll need to weigh the potential benefit of taking it against the risk of ulcers and decide what is in your best interests.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.