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Evaluating the impact of regulatory action on denosumab-induced hypocalcaemia in Japan

Takuya Imatoh1, Kimie Sai1, Mayu Takeyama2

  • 1Division of Medicinal Safety Science, National Institute of Health Sciences, Kawasaki, Japan.

Journal of Clinical Pharmacy and Therapeutics
|July 9, 2019
PubMed

Insights

Regulatory action in Japan significantly increased calcium supplementation with denosumab, preventing a rise in hypocalcaemia. This highlights the effectiveness of safety communications in clinical practice.

Area of Science:

  • Pharmacovigilance and Drug Safety
  • Health Services Research
  • Clinical Pharmacology

Background:

  • Denosumab, introduced in April 2012, was associated with serious hypocalcaemia, including fatalities, prompting a safety communication ('Blue letter') in Japan.
  • Understanding the real-world impact of such regulatory actions on clinical practice and patient safety is crucial.

Purpose of the Study:

  • To evaluate the impact of a regulatory safety communication on denosumab-induced hypocalcaemia in Japan.
  • To assess changes in calcium supplementation and monitoring practices following the safety warning.

Main Methods:

  • Utilized two electronic medical information databases (MIDs) covering patients prescribed denosumab or zoledronic acid (April 2012-September 2014).
  • Assessed four key indicators: calcium supplementation, serum calcium testing rates and frequency, and hypocalcaemia prevalence, aggregated quarterly.
  • Employed difference-in-difference (DID) analysis to evaluate the regulatory action's impact.

Main Results:

  • The proportion of patients receiving calcium supplementation at initial denosumab treatment increased consistently across both datasets.
  • Data set two showed an increase in the average number of serum calcium tests performed.
  • Difference-in-difference analysis revealed significant positive influences of the regulatory action on the combination use of denosumab with calcium and vitamin D supplements in both datasets.

Conclusions:

  • The regulatory action significantly influenced the co-prescription of denosumab with calcium and/or vitamin D supplements.
  • The absence of a notable increase in denosumab-induced hypocalcaemia suggests the regulatory action was effective in the studied clinical settings.
  • Regulatory safety communications play a vital role in enhancing drug safety in clinical practice.
Abstract

Keywords:
denosumabhypocalcaemiamedical information databasepharmacovigilance

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