Copyright © 2007 by American Society of Health-System Pharmacists
Rimonabant: A novel selective cannabinoid-1 receptor antagonist for treatment of obesityPRITI N. PATEL, PHARM.D., BCPS, is Assistant Clinical Professor, College of Pharmacy and Allied Health Professions, and Director, Drug Information Center, St. Johns University, Queens, NY. ROLEE PATHAK, PHARM.D., BCPS, is Clinical Assistant Professor, Ernest Mario College of Pharmacy, Rutgers University, Piscataway, NJ, and Clinical Coordinator, Englewood Hospital and Medical Center, Englewood, NJ. Address correspondence to Dr. Patel at the College of Pharmacy and Allied Health Professions, St. Johns University, St. Albert Hall, Room 114, 8000 Utopia Parkway, Queens, NY 11439 (patelp2{at}stjohns.edu).
Summary. Discovery of the cannabinoid receptors has led to the development of rimonabant, a cannabinoid-1 (CB1) antagonist. Selective blockade of this receptor has been shown to lead to decreased appetite and food intake in animal models. Clinical studies have shown that rimonabant 20 mg once daily produces significant decreases in weight and waist circumference in obese human subjects and improves the lipid profile and glucose control. The frequency of metabolic syndrome also decreased significantly with rimonabant 20 mg daily. Limited data are available regarding the pharmacokinetics and pharmacodynamics of rimonabant. Preclinical data have demonstrated a long duration of action. As of yet, no drugdrug, drugfood, or drug disease interactions have been identified with rimonabant. Adverse reactions occurred rarely, with nausea, dizziness, diarrhea, arthralgia, and back pain being the most common. Psychiatric disorders, including depression and anxiety, were the most common reasons for subjects to withdraw from rimonabant studies. Rimonabant has been shown to be safe for up to two years of treatment. Further research will clarify currently unknown areas, including pharmacokinetics, drug interactions, and the drugs role in standard therapy.
Conclusion. Rimonabant, a selective CB1 antagonist, is a novel treatment option for obese and overweight individuals. Significant weight loss, decrease in waist circumference, and improvements in lipid profile and glucose control have been shown in clinical trials of rimonabant.
Index terms: Anorexics; Dosage; Drug administration; Drug interactions; Duration of action; Mechanism of action; Obesity; Pharmacodynamics; Pharmacokinetics; Rimonabant; Toxicity
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