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Co-prescribing of topical and systemic beta-blockers in patients with glaucoma: a quality use of medicine issue in Australian practice

Authors

  • Ivan Goldberg FRANZCO,

    Corresponding author
    1. Department of Ophthalmology, Sydney Eye Hospital, University of Sydney, Sydney, and
      Dr Ivan Goldberg, Glaucoma Service, Sydney Eye Hospital, Floor 4, c/- Eye Associates, 187 Macquarie St., Sydney, NSW 2000, Australia. Email: eyegoldberg@gmail.com
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  • Michael A Adena PhD

    1. Covance Pty Ltd., North Ryde, New South Wales, Australia
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Dr Ivan Goldberg, Glaucoma Service, Sydney Eye Hospital, Floor 4, c/- Eye Associates, 187 Macquarie St., Sydney, NSW 2000, Australia. Email: eyegoldberg@gmail.com

Abstract

Purpose:  Prescribing topical beta-blockers for patients with glaucoma, who are also being treated with systemic beta-blockers, raises efficacy and safety concerns. This potentially inappropriate co-prescribing practice is a Quality Use of Medicine issue. This study aimed to quantify the extent of co-prescribing of topical and systemic beta-blockers in Australian clinical practice.

Methods:  This is a retrospective analysis of de-identified billing data for supply (surrogate marker for prescribing) of topical and systemic beta-blockers from the Pharmaceutical Benefits Scheme (1999–2004) to concessional patients supplied either topical or systemic beta-blockers. The primary outcome was the percentage of patients supplied systemic beta-blockers within the patient population supplied topical beta-blockers. This percentage was calculated for each financial year (July 1999–June 2004), age group (<65 years; 65–74 years; 75–84 years; ≥85 years) and sex.

Results:  Approximately 20% of patients supplied topical beta-blockers (representing Australian glaucoma patients) were also supplied systemic beta-blockers, equating to more than 20 000 patients per year. This percentage varied with age, but not with year or sex. The percentage of patients co-supplied topical and systemic beta-blockers was the lowest (13%) for patients <65 years and the highest (23%) for patients 75–84 years.

Conclusions:  Pharmaceutical Benefits Scheme supply data shows that the potentially inappropriate practice of co-prescribing topical and systemic beta-blockers affects more than 20 000 concessional patients in Australia each year, particularly the elderly. This Quality Use of Medicine issue has now been quantified; doctors, pharmacists and patients must be made aware of the reduced efficacy and potential for more side-effects from this co-prescribing practice.

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