In theory, yes - the active ingredients come from plants. But most actual products tend to have a whole bunch of non-active ingredients, which may or may not be vegan. I heard a rumour that Anadin Extra is vegan, but I'd check first. If you have a good chemist, they should know and be able to advise.
That aside, if you have to take painkillers, then take painkillers. Not to do so is to place others' health above your own. Perhaps this is something you want to do, but not many vegans would, I think.
> Are asprin and ibuprofen vegan?
> (By: Kristen)