I usually only take excedrin, and I crush it so it gets into the bloodstream much faster, speed is quite important with stopping migraines.

You should make sure its ok before crushing any pill. Most pills are only partially dissolved into the bloodstream before passing out of your system, or they are meant to be released slowly. They are made to be this way. Crushing certain tablets can be a means of overdosing because you are getting much more than you would having swallowed the pill. As well as making sure its ok, with some things like non-prescription pain meds, take a smaller dose if you plan to crush it.