Monday Night Murals: I'm a pain reliever junkie / I got a Bayer on my back

Riddle me this, X-Men! What does Professor Charles Xavier take when he has a headache?

X-Men: Legacy #220-222 (March-May 2009), art by Lee Bermejo and Morry Hollowell
(Click picture to Paracetamolsize)

Why...X-Cedrin, of course!