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FDA actions in brief

Naltrexone extended-release injectable suspension (Vivitrol, Alkermes/Cephalon) was approved for the treatment of alcohol dependence in patients who can abstain from drinking in an outpatient setting and who are not actively drinking at the time treatment is initiated.

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Natalizumab: FDA is concerned-should managed care be, too?

FDA officials said the agency "remains very concerned" that patients who take natalizumab (Tysabri, Biogen Idec/Elan) may develop a rare, potentially fatal brain infection called progressive multifocal leukoencephalopathy (PML). So starts a report from Reuters published on February 15, 2006. Should managed care also be concerned? If so, how should managed care formulary decision-makers respond? What is their role in managing patients who are clamoring for even more products to treat their diseases in an era in which it seems that miracles are a daily occurrence in the world of biotechnology? What role should managed care play in refereeing potentially devastating side effects for a disease that frightens patients as much as multiple sclerosis (MS)?

FDA aims to encourage drug development; von Eschenbach nominated as permanent head

Last month FDA unveiled a long-awaited list of collaborative projects to streamline and accelerate the development of new medical treatments. Then Health and Human Services (HHS) Secretary Mike Leavitt joined Andrew von Eschenbach, MD, and Deputy Commissioner Janet Woodcock, MD, in urging implementation of the Critical Path initiative. Dr von Eschenbach, who hopes to oversee this effort as permanent FDA head following his official nomination to the position, says he is committed to fully implementing the initiative in order to "dramatically increase the success rate in moving products from the lab to the patient."

Aspirin resistance: a growing concern

Aspirin is the cornerstone of therapy in the treatment and prevention of cardiovascular disease. The potential benefit of aspirin therapy may be significantly reduced in patients with aspirin resistance, creating a clinical and economic burden on the healthcare system. The purpose of this article is to clarify the term "aspirin resistance," describe the proposed mechanisms, review the clinical outcome studies with associated resistance testing, and discuss the potential pharmacologic management of this problem. Literature searches were performed using MEDLINE (January 1966 to January 2006) for review articles on aspirin resistance and antiplatelet activity. Aspirin's primary mechanism of action is to irreversibly inhibit cyclooxygenase-1 (COX-1); however, there are reports of alternative biochemical pathways producing platelet aggregation. The addition of thienopyridines to aspirin should be considered for the management of aspirin-resistant patients. (Formulary. 2006;41:192–201.)

FDA actions in brief

Sodium phosphate monobasic monohydrate/sodium phosphate dibasic anhydrous tablets (OsmoPrep, Salix) were approved by FDA for cleansing of the colon prior to colonoscopy in patients aged 18 years or older.

Emsam

Selegiline is an irreversible inhibitor of monoamine oxidase (MAO) whose mechanism of action in the treatment of depression is not fully understood.

Erbitux

Cetuximab binds specifically to the epidermal growth factor receptor (EGFR), a transmembrane protein expressed in many human cancers, including those of the head and neck, colon, and rectum.

Incretin hormones in the treatment of type 2 diabetes

Type 2 diabetes mellitus is a progressive disease affecting more than 18 million Americans. Incretin mimetics and DPP-IV inhibitors are new classes of antihyperglycemic agents that may improve glycemic control in patients with type 2 diabetes. The incretin hormone, glucagon-like peptide 1 (GLP-1), stimulates glucose-dependent insulin secretion, suppresses inappropriate glucagon secretion, and slows gastric motility. GLP-1 levels are decreased in type 2 diabetes. GLP-1 is rapidly inactivated by the enzyme dipeptidyl peptidase-IV (DPP-IV), resulting in a half-life of <2 minutes. Strategies to increase GLP-1 activity include the development of incretin mimetics that are resistant to DPP-IV degradation and the development of DPP-IV inhibitors. Clinical trials have demonstrated that the incretin mimetics exenatide and liraglutide, as well as the DPP-IV inhibitor vildagliptin, improve glycemic control, reduce weight, and are fairly well tolerated. Exenatide (Byetta, Amylin/Lilly) was approved by FDA in April 2005..

Lubiprostone: A novel chloride channel activator for the treatment of constipation

Lubiprostone (Amitiza, Sucampo/Takeda) was approved on January 31, 2006, for the treatment of chronic idiopathic constipation in adults when the cause of the condition is unknown. The agent has a unique mechanism of action compared with current therapies on the market in that it locally activates specific chloride channels (ClC-2) in the lining of the small intestines after oral administration, thereby increasing intestinal fluids and softening bowel movements. In double-blind, placebo-controlled trials, lubiprostone demonstrated efficacy in improving the frequency of spontaneous bowel movements and other related constipation symptoms. Lubiprostone was reported to be well tolerated in clinical trials; the most common adverse effects were mild-to-moderate nausea and headache.

FDA revises drug labels to clarify information for health professionals

FDA began 2006 by unveiling a long-anticipated final rule that significantly overhauls approved labeling for drugs and biologics. This new rule has been in the works for years, delayed by manufacturer concerns that the revisions will expose companies to more liability suits. Although the new labeling's basic framework came as no surprise, compliance will require significant investments by manufacturers to meet the new design and content requirements, which will double the length of many package inserts (PIs).

ICAAC 2006: Physicians warn of overuse of vancomycin in treating hospital-acquired pneumonia

Vancomycin may be overused for the treatment of hospital-acquired pneumonia, perhaps because of physicians' perceptions that patients are at high risk for methicillin-resistant Staphylococcus aureus (MRSA), according to a study by Robert H. Eng, MD, and colleagues at the Veterans Affairs New Jersey Health Care System in East Orange, NJ. The study was presented at the 45th ICAAC meeting in Washington, DC.

ICAAC 2006: Gastric acid-suppressive drugs linked to C difficile infection

The use of acid-suppressive drugs, particularly proton pump inhibitors (PPIs), was associated with an increase in the risk of community-acquired Clostridium difficile-associated disease (CDAD) in the United Kingdom, reported Sandra Dial, MD, MSc, at the 45th ICAAC meeting in Washington, DC.

Statin therapy benefits ACS patients with low LDL-cholesterol levels

A study of 155 patients examining the effects of statins on patients diagnosed with acute coronary syndrome (ACS) suggests that statin therapy may increase survival rates and potentially extends the results of larger, recently performed randomized trials to those with low-density lipoprotein cholesterol (LDL-C) levels of 80 mg/dL and below.

Topiramate safely decreases body mass hypertension

Topiramate safely decreases body mass, hypertension. Topiramate reduces body weight and blood pressure with generally mild-to-moderate adverse effects, according to a randomized, placebo-controlled trial involving obese subjects with hypertension.

Meta-analysis concludes statins have no effect on cancer risk

A recent meta-analysis published in the Journal of the American Medical Association (JAMA) found that statins have no effect on cancer risk. The finding is in contrast with at least 7 retrospective analyses that suggest that statins reduce the risk of developing cancer.

Colesevelam/fenofibrate combination boosts efficacy in treatment of hyperlipidemia

Colesevelam/fenofibrate combination boosts efficacy in treatment of hyperlipidemia. Fenofibrate significantly reduced low-density lipoprotein cholesterol (LDL-C) in patients with mixed hyperlipidemia when used in combination with the specifically engineered bile acid sequestrant (SE-BAS) colesevelam, according to a study published in Current Medical Research and Opinion.