You have a headache, what do you do? If you're like most of the teens we asked, you open the medicine cabinet and take out your pain reliever of choice. How much do you know about that pill's active ingredient, the compound that works with your body to bring relief to your symptoms? How will it interact with your allergy medicine? Can you increase the dose if it's not helping? Take this quiz and see if you have enough of the information you need to help yourself feel better.