RT Book, Section A1 Trevor, Anthony J. A1 Katzung, Bertram G. A1 Kruidering-Hall, Marieke M. A1 Masters, Susan B. SR Print(0) ID 56985425 T1 Chapter 60. Dietary Supplements & Herbal Medications T2 Katzung & Trevor's Pharmacology: Examination & Board Review, 10e YR 2013 FD 2013 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-178923-3 LK accesspharmacy.mhmedical.com/content.aspx?aid=56985425 RD 2024/03/29 AB Dietary supplements, which include substances known as botanical and herbal medications, are available without prescription and, unlike over-the-counter medications, are considered to be nutritional supplements rather than drugs. These substances are marketed in the United States without FDA or other governmental premarketing review of efficacy or safety, and with little government oversight of purity, variations in potency, or adverse effects. Purified nonherbal nutritional supplements such as dehydroepiandrosterone (DHEA) and melatonin are also used widely by the general public in pursuit of "alternative medicine." In the case of many herbal products and nutritional supplements, evidence from controlled clinical studies for their medical effectiveness is incomplete or nonexistent. A summary of the intended uses of some herbal products and nutritional supplements is presented in Table 60–1.