What would happen if i took topomax if i'm allergic to sulfa drugs?

Probably nothing: "Approx 3% of population mounts allergic reaction to sulfonamide antibiotics,w/ the most common reaction being rash.Studies have failed to show any cross-sensitivity among the three different classes (which incl Topamax). However,patients w/ history of reacting to one class may simply be predisposed to allergic reactions to meds in general & thus monitoring may be warranted." http://bit.ly/1xUbLWt