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A systematic review of the effectiveness of policies restricting access to pregabalin

Authors
  • Stacey, Brett R.1
  • Liss, Jonathan2
  • Behar, Regina3
  • Sadosky, Alesia3
  • Parsons, Bruce3
  • Masters, Elizabeth T.3
  • Hlavacek, Patrick3
  • 1 University of Washington, Center for Pain Relief at UWMC-Roosevelt, 4225 Roosevelt Way NE, Seattle, WA, 98105, USA , Seattle (United States)
  • 2 Medical Research and Health Education Foundation, 7196 North Lake Drive, Suite A, Columbus, GA, 31909, USA , Columbus (United States)
  • 3 Pfizer Inc, 235 East 42nd Street, New York, NY, 10017, USA , New York (United States)
Type
Published Article
Journal
BMC Health Services Research
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Aug 25, 2017
Volume
17
Issue
1
Identifiers
DOI: 10.1186/s12913-017-2503-x
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundFormularies often employ restriction policies to reduce pharmacy costs. Pregabalin, an alpha-2-delta ligand, is approved for treatment of fibromyalgia (FM); neuropathic pain (NeP) due to postherpetic neuralgia (PHN), diabetic peripheral neuropathy (pDPN), spinal cord injury; and as adjunct therapy for partial onset seizures. Pregabalin is endorsed as first-line therapy for these indications by several US and EU medical professional societies. However, restriction policies such as prior authorization (PA) and step therapy (ST) often favor less costly generic pain medications over pregabalin.MethodsA structured literature search (PubMed, past 11 years) was conducted to evaluate whether restriction policies against pregabalin support real-world economic and healthcare utilization benefits.ResultsSearch criteria identified three claims analyses and a modeling study that evaluated patients with NeP and/or FM with and without PA restrictions; three other studies included patients with FM and NeP in plans with ST requirements, and one evaluated a mail order requirement program. All studies evaluated outcomes during follow-up periods of 6 months or longer. Overall, PA, ST, and mail order restriction policies effectively reduced pregabalin usage, but the effects were inconsistent with reducing pharmacy costs and were non-significant for total disease-related medical costs. Two studies (one PA; one ST) reported significantly higher disease-related costs in restricted plans. The modeling study failed to demonstrate cost savings with PA. Opioid usage was higher in PA-restricted plans (two studies). The US Centers for Disease Control and Prevention and several professional NeP guidelines recommend opioid use only in cases when other non-opioid pain therapies have proven ineffective. New US Government taskforce guidelines now seek to reduce opioid exposure. Additionally, in both ST studies, gabapentin utilization (a common ST edit) was significantly increased. Both studies had substantial proportions of FM and pDPN patients and the only pain condition gabapentin is approved to treat in the United States is PHN.ConclusionPA and ST restriction policies significantly decrease utilization of pregabalin, but do not consistently demonstrate cost savings for US health plans. More research is needed to evaluate whether these policies may lead to increased opioid usage as found in some studies.Trial registrationN/A.

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