http://www.fda.gov/cder/Offices/OTC/consumer.htm
Center for Drug Evaluation and Research, U.S. Food and Drug Administration
Over-the-counter (OTC) drugs products are those drugs that are available to consumers without a prescription. There are more than 80 therapeutic categories of OTC drugs, ranging from acne drug products to weight control drug products. The FDA's Center for Drug Evaluation and Research oversees OTC drugs and offers these consumer guidelines.