Find a Medication Guide FDA-approved information accompanying prescription drugs that provide patients with facts such as side effects, drug interactions, storage, ingredients Learn about the side effects, dosages, and interactions of prescription drugs, over-the-counter medicines, herbs, and supplements. Look up information about prescription drugs, over-the-counter medications, herbs, vitamins and supplements. As defined by the National Cancer Institute, dosage forms of medication can include tablets, capsules, liquids, creams, and patches. Medications can be administered in different ways, such as by mouth, by infusion into a vein, or by drops put into the ear or eye. Quickly and easily find your medication from our A to Z list of over 24,000 prescription and OTC drugs. Here is a list of the top 50 prescription drugs in the United States. This list also includes drugs doctors prescribe that may be available over the counter (OTC). 1. Atorvastatin treats high cholesterol. It is a member of the statins or HMG-CoA reductase inhibitor class. The class has been around for decades. Find out how your medicine works, how and when to take it, possible side effects and answers to your common questions. Online database of the most popular drugs and their side effects, interactions, and use. Index of comprehensive articles on common prescription and OTC medications and drugs, a listing. Monographs cover generic and brand name, drug class and mechanism, dosing, drug interactions, side effects,and use. Find detailed information on prescription drugs, OTC medications, vitamins and dietary supplements, including their uses, side effects, and interactions.