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Background/purpose: Dabigatran is effective in preventing ischemic stroke and systemic embolism in patients with atrial fibrillation. Although the therapeutic window for dabigatran is wide, its pharmacokinetic properties can differ between specific populations. This study aimed to establish a real-life plasma dabigatran concentration database and investigate potential factors affecting this concentration in Asians., Methods: Patients under dabigatran therapy were recruited. Plasma dabigatran concentration was determined in trough and peak blood samples by using ultra-high performance liquid chromatography with tandem mass spectrometry analysis. Factors affecting the dabigatran concentration were investigated., Results: A total of 46 patients (33 male, 71.7%) were prospectively enrolled. Most of them were receiving a low dose regimen (110 mg twice daily, n = 38, 82.6%). The trough and peak concentrations were significantly correlated (p < 0.001), and the trough concentration was higher in patients aged ≥75 years, body weight ≤60 kg, creatinine clearance (CrCl) ≤50 mL/min, CHA 2 DS 2 -VASc score >3 points, and HAS-BLED score ≥3 points. Multiple linear regression analysis identified body weight and serum creatinine as key factors predicting trough concentration (p = 0.003 and 0.005, respectively). Importantly, drug adherence was the only independent factor associated with low trough concentration, defined as the lowest 20th percentile in our study cohort (n = 10, hazard ratio = 9.07; 95% CI, 1.12 to 73.22; p = 0.004)., Conclusion: Dabigatran monitoring may be considered for patients at risk of overexposure, especially those with low body weight and renal insufficiency, and also for detecting those with extremely low drug concentration., (Copyright © 2018. Published by Elsevier B.V.)