A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes.
Antimigraine agents are used to treat migraine headaches. Migraines are different from other headaches because they occur with symptoms such as nausea, vomiting, or sensitivity to light. Some people who get migraines have warning symptoms, called an aura, before the actual headache begins. Pain relieving drugs can be taken as soon as the pain begins and include agents in the drug classes such as ergots, triptans and NSAID's.