What’s the real picture of total opioid use in Australia?


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NSW researchers have quantified – for the first time – that data based on PBS/RPBS claims underestimates total prescription opioid use

Researchers from the National Drug and Alcohol Research (NDARC) at the University of NSW have attempted to quantify actual opioid use in Australia, arguing that estimates based on pharmaceutical claims alone are “problematic”, as opioids below the reimbursement threshold or sold OTC are not recorded.

They looked as sales data from IMS Health from 2010 to 2014 to represent total opioid utilisation in Australia, including all prescription-only and OTC opioid purchases (those containing low-dose codeine combinations) sold directly to pharmacies and hospitals.

In analyses, opioid use was presented in oral morphine equivalent (OME) kilograms, with the authors suggesting this calculation is more accurate at quantifying true utilisation than defined daily doses (DDDs).

Researchers found PBS/RPBS claims data did not account for 12.4% of prescription-only opioid utilisation in 2014 and 19.1% in 2010, and 18.4% to 25.4% of total opioid use when accounting for OTC preparations.

Oxycodone accounted for almost one third of total opioid use across all study years, while at least 21% of hydromorphone and a further 21% of prescription codeine utilisation were not accounted for in PBS/RPBS claims.

They also found that while OTC codeine items accounted for 40-50% of codeine sales in Australia, they comprised approximately only 6% of total opioid utilisation in OME.

“Hence, at a population level, most of the opioid utilisation across Australia can be accounted for by data on utilisation of prescription opioids,” say the authors.

“Despite increased capture of less expensive (under co-payment) opioid items since 2012, PBS/RPBS claims still underestimate opioid use in Australia, with varying degrees across opioids.”

They add that given claims data primarily records dispensing of subsidised or insured prescription medicines, there is a significant gap in the data from private community prescriptions (potentially accounting for a further 6% of opioid use in total) as well as opioid use by inpatients in public hospitals.

The authors also point out that dispensed quantities or number of packs sold do not directly equate to actual use.

“Further, the impact of the decision to restrict the availability of OTC codeine preparations in Australia from 2018 is yet to be seen.”

Pharmacoepidemiology and Drug Safety 2017; online 19 October

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4 Comments

  1. Jarrod McMaugh
    23/10/2017

    Makes the issue around codeine seem a little more realistic now doesn’t it.

    For a long time I’ve been talking about overall opioid use being significantly more problematic than codeine OTC. Now we quantify that OTC is 6% of the overall problem.

  2. Debbie Rigby
    23/10/2017

    The important statistic out of this paper is that OTC codeine represents about 40-50% of codeine sales in Australia. A significant amount and contributing to the safety issues associated with inappropriate use of opioids.

    • james jefferies
      23/10/2017

      Statistics are a funny thing. What I got out of it, was that despite all their jumping up and down about safety. Drs are responsible for 50-60% of the codeine usage in Australia. Probably more if you took into account the scripts and pieces of paper that come in from Dr’s for OTC strength codeine.

      • Jarrod McMaugh
        23/10/2017

        A significant portion of OTC sales are “on the advice of their GP”

        The tricky part is figuring out how much of that is recent, how much of it is a recommendation from eons ago, and how many are just a rote response to quicken the process.

        The reality is, codeine needs monitoring, therefore cannot remain schedule 3 (by definition of the schedule 3 requirements). Changing to schedule 4 will reveal just how much codeine use is being driven by GP recommendations.

        It’s also worth noting that iatrogenic harm from opioid prescribing is significant, and codeine makes up a small part of this.

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