Drug Information

MedlinePlus: Herbs and Supplements
from MEDLINE Plus,consists of MedMasterô from the American Society of Health-system Pharmacists and a subset of the Natural Standard Herbs and Supplements.
MedicineNet Pharmacy
Top 300 Prescriptions
most prescribed medications
Drug Information (Healthtouch)
prescription and over-the-counter medications
Food and Drug Administration
Provides access to the FDA's information on human and animal drugs, vitamins, medical devices, radiologic health, biologics, and cosmetics.
Drug Interactions: What you should know
from the FDA/Center for Drug Evaluation and Research (CDER)