I did not know that Vioxx contains aspirin. My sister has been taking it for some time but has also had many problems. She went to a new doctor and he asked about what she was allergic to. She mentioned aspirin. He asked her why was she taking Vioxx then. He told her that Vioxx contained aspirin and that was causing a lot of her problems. Just thought I would mention this in case others with allergies to aspirin would know.