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Research

The impact of the introduction of a formulary into a large Canadian private drug plan: an interrupted time-series analysis

Alan Cassels and Michael R. Law
July 18, 2019 7 (3) E472-E477; DOI: https://doi.org/10.9778/cmajo.20180124
Alan Cassels
Faculty of Human and Social Development (Cassels, Law), University of Victoria, Victoria, BC; Centre for Health Services and Policy Research (Law), School of Population and Public Health, University of British Columbia, Vancouver, BC
MPA
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Michael R. Law
Faculty of Human and Social Development (Cassels, Law), University of Victoria, Victoria, BC; Centre for Health Services and Policy Research (Law), School of Population and Public Health, University of British Columbia, Vancouver, BC
PhD
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  • Figure 1:
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    Figure 1:

    Average monthly number of prescriptions per member where at least a portion was paid by the benefits plan, before and after a change to the provincial formulary in June 2013.

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    Figure 2:

    Interrupted time-series analysis of the number of prescriptions per member for grandfathered medications paid for by the plan before and after the change to the public formulary in June 2013.

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    Figure 3:

    Average number of prescriptions for members before and after the change to the PharmaCare formulary in June 2013, by Pharma-Care benefit type.

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    Figure 4:

    Interrupted time-series analysis of reimbursed dollars per member before and after the change to the public formulary in June 2013.

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    Table 1:

    Top 10 medicines in terms of reductions in prescription volume following the adoption of the Fair PharmaCare formulary by the drug benefits plan of the BC Health Employees’ Union

    IngredientNo. of prescriptions% change
    BeforeAfterDifference
    Zopiclone18 9121953−16 959−89.7
    Pantoprazole10 0912655−7436−73.7
    Rabeprazole91161782−7334−80.5
    Esomeprazole80571312−6745−83.7
    Bupropion81332192−5941−73.0
    Tramadol, combinations6281732−5549−88.3
    Mometasone70511613−5438−77.1
    Celecoxib4845281−4564−94.2
    Pregabalin3928534−3394−86.4
    Gliclazide44031067−3336−75.8
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CMAJ Open: 7 (3)
Vol. 7, Issue 3
1 Jul 2019
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The impact of the introduction of a formulary into a large Canadian private drug plan: an interrupted time-series analysis
Alan Cassels, Michael R. Law
Jul 2019, 7 (3) E472-E477; DOI: 10.9778/cmajo.20180124

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The impact of the introduction of a formulary into a large Canadian private drug plan: an interrupted time-series analysis
Alan Cassels, Michael R. Law
Jul 2019, 7 (3) E472-E477; DOI: 10.9778/cmajo.20180124
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