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Riluzole, a drug used in the management of amyotrophic lateral sclerosis (ALS), is associated with a high incidence of liver failure. It is imperative to determine risk factors and severity of liver injury in patients taking riluzole to devise an appropriate treatment regimen. We, therefore, studied risk factors for liver injury in ALS patients who were prescribed riluzole at Kitasato University East Hospital from 1999 to 2015. Of the 222 patients enrolled in this study, 113 and 109 patients were diagnosed with mild to moderate (grade 1 or 2) and without (grade 0) liver injury, respectively. Prediction of risk factors was determined using binary logistical regression analyses. The results showed that 50.9% (n=113) of ALS patients developed mild to moderate liver injury; 71.7% and 53.1% of patients were concurrently using CYP1A2 inhibitors (p=0.005) and diclofenac (p=0.032), respectively; 55.8% of patients with liver injury had a history of smoking (p=0.011). Multivariate analyses revealed that the concurrent use of CYP1A2 inhibitors [odds ratio (OR) 2.152, 95% confidence interval (CI) 1.225-3.780, p=0.008] and history of smoking (OR 1.938, 95% CI 1.125-3.340, p=0.017) were independent risk factors for liver injury in patients receiving riluzole. In conclusion, treatment of ALS patients with riluzole, smoking habits, and concurrent use of CYP1A2 inhibitors are independent liver injury risk factors. Further studies on liver injury are warranted in ALS patients treated with riluzole to comprehensively understand the underlying mechanisms of riluzole-associated liver toxicity.

Liver Injury Risk Factors in Amyotrophic Lateral Sclerosis Patients Treated with Riluzole