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Raloxifene: A Selective Estrogen Receptor Modulator (SERM) with Multiple Target System Effects

Lilly Research Laboratories, Indianapolis, Indiana, USA

Correspondence: Douglas B Muchmore, M.D., Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana 46285, USA. Telephone: 317-277-7332; Fax: 317-277-8165; e-mail: Dmuch{at}lilly.com

ABSTRACT

Selective estrogen receptor modulators (SERMs) exhibit a pharmacologic profile characterized by estrogen agonist activity in some tissues with estrogen antagonist activity in other tissues. These compounds were initially called "antiestrogens," but it was subsequently recognized that this inadequately described their spectrum of activities. The first widely used SERM, tamoxifen, has estrogen antagonist activity in breast tissue but shows estrogen-like activity in other tissues. Raloxifene is another SERM in clinical use, and it was developed to avoid some of the undesirable estrogen agonist actions of other SERMs to improve the drug safety profile. Raloxifene has been introduced for clinical use in treatment and prevention of postmenopausal osteoporosis. This review will explore the preclinical and clinical pharmacology of raloxifene, and compare it to other SERMs currently available for clinical use.

Key Words. Raloxifene • Selective estrogen receptor modulators • Osteoporosis • Cholesterol • Uterus • Estrogen • Tamoxifen

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