What if I've been allergic to drugs before?

Allergic or quasi-allergic reactions to most drugs, including all anesthetic
drugs, are actually quite rare. Even better, the vast majority of these
reactions are quite minor, resulting in little more than a rash. If a serious
allergic-type reaction does occur under anesthesia we are able to recognize
and treat the process before it becomes life-threatening.

Much more commonly, people have non-allergic side effects and reactions
such as blood pressure changes, nausea and vomiting, etc.  Our entire
focus of practice in anesthesiology is aimed at preventing these.