RESUMO
PURPOSE: We examined the extent of concurrent use of antiplatelets, anticoagulants, or digoxin with Chinese medications (CMs) and identified its associated factors. METHODS: A retrospective cohort study was conducted using one million random samples from the Longitudinal Health Insurance Database 2005 in Taiwan. High-risk Western medications (HRWMs) focused on in this study were antiplatelets (aspirin, clopidogrel, dipyridamole, ticlopidine), anticoagulants (heparin, warfarin), and digoxin. Concurrent use was described as having an overlapping use period of HRWM with CMs any time in 2005. Baseline demographics, comorbidities, and health service utilizations between patients with and without concurrent HRWM-CM use were compared. Logistic regression analyses were performed to identify factors associated with incident concurrent use. RESULTS: Of the 70,698 eligible HRWM users, 13.2 % used CMs concurrently for an average duration of 26.7 ± 43 days. The incidence of concurrent HRWM-CM use, which excluded prior CM use within 6 months preceding the first CM use, was 6.3 %. Warfarin or ticlopidine users were more likely to be prescribed with CMs than were the other HRWM users. Factors associated with an increasing incidence of concurrent HRWM-CM use included female sex, age 45-54 years, middle monthly income, higher number of outpatient visits or distinct prescribed medications, and a previous diagnosis of heart diseases, stroke, or hypertension. In contrast, age ≥ 65 years and higher medical expenditure were associated with a lower incidence of concurrent use. CONCLUSIONS: In the Taiwanese population, approximately one in eight HRWM users were concomitantly prescribed CMs. Whether such concurrent use is associated with adverse clinical outcomes warrants further investigations.