Prescription sequence symmetry analysis: Assessing risk, temporality, and consistency for adverse drug reactions across datasets in five countries

Nicole Pratt, Esther W. Chan, Nam Kyong Choi, Michio Kimura, Tomomi Kimura, Kiyoshi Kubota, Edward Chia Cheng Lai, Kenneth K.C. Man, Nobuhiro Ooba, Byung Joo Park, Tsugumichi Sato, Ju Young Shin, Ian C.K. Wong, Yea Huei Kao Yang, Elizabeth E. Roughead

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Background: Prescription sequence symmetry analysis (PSSA) is a signal detection method for adverse drug events. Its capacity to consistently detect adverse drug events across different settings has not been tested. We aimed to determine the consistency of PSSA results for detecting positive and negative control adverse drug events across different settings. Methods: Using a distributed network model, we analyzed prescription dispensing data using PSSA in Australia, Hong Kong, Japan, Korea, and Taiwan. Positive control was amiodarone and thyroxine, as a marker of amiodarone-induced hypothyroidism, a known adverse event with a clear temporal relationship to amiodarone initiation. Negative controls were amiodarone and allopurinol, as a marker of amiodarone-induced gout and thyroxine and allopurinol, as a marker of thyroxine-induced gout. Gout is not recorded as an adverse event in product information for either medicine. Adjusted sequence ratios (ASR) were calculated for each country. Pooled estimates were obtained by using the generic inverse variance method. Results: A positive association was identified between amiodarone and thyroxine in all settings with a pooled ASR 2.63 (95% confidence interval (CI) 1.47-4.72). Temporal analysis showed the effect occurred within the first few weeks of treatment. No significant associations were found for the negative controls in any setting; pooled ASR were 0.76 (95%CI 0.62-0.93) and 0.98 (95%CI 0.85-1.12) for amiodarone-allopurinol and thyroxine-allopurinol, respectively. Conclusion: Despite different health settings, different populations, and different patterns of medicine utilization, PSSA gave consistent estimates across countries for a well-known positive association and two negative control adverse events.

Original languageEnglish
Pages (from-to)858-864
Number of pages7
JournalPharmacoepidemiology and Drug Safety
Volume24
Issue number8
DOIs
StatePublished - 1 Aug 2015

Keywords

  • Amiodarone
  • Hyperthyroidism
  • Pharmacoepidemiology
  • Pharmacovigilance
  • Prescription symmetry analysis

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