Does anyone know why we as post-ops cannot take medicine such as ibuprophen?

I was wondering why we are not supposed to take medications such as ibuprophen, Aleve, Vioxx etc. What will happen if we do take them? What are the long term adverse effects?

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.