Naproxen
"First time took two 220mg had chest pain and left arm pain lasted few days. Thought I just took to much. 5 months later another neck ache only thing with me at work those same rugby 220 naproxen. Instantaneously felt like I was having a heart attack, the following day my knees became swollen and  I couldn't walk. Three weeks later I still feel like I am having a heart attack. This product is the direct cause and the doctors have yet to figure out what it is. My chest keeps swelling up randomly, I have a one year old and a three year old and hate the thought I might die from taking one dumb pill for pain. Never again I'll just take the pain."