• Mehmet Çelik, Yusuf Arslan, Taylan Önder, Sevil Alkan, Ahmet Şahin, and Fethiye Akgül.
• Mehmet Çelik, Karşiyaka neighborhood, 498th street Tema Yeşilvadi Buildings A-block, Floor:6, No:12, Haliliye/Sanliurfa, Turkey, dr.mcelik12@gmail.com.
• Croat. Med. J. 2024 Aug 31; 65 (4): 305312305-312.

AimTo identify possible drug-drug interactions in patients taking medications for other comorbidities while on antiviral therapy for chronic hepatitis B.MethodsThe study enrolled patients with chronic hepatitis B aged ≥60 years who were treated with antiviral therapy in five hospitals in Turkey between January 1 and March 1, 2023. The Lexicomp® Drug Interactions program was used to identify possible drug-drug interactions.ResultsThe study included 213 patients (119 [55.9%] men). The mean age was 68.5 years. A potential drug-drug interaction was identified in 112 patients (52.6%). The most common type of interaction was type C ("follow the treatment") (71.54%). The number of potential drug-drug interactions increased with an increase in the number of drugs used by the patients. A robust and affirmative correlation was observed between the number of medications used and the number of possible drug-drug interactions (r=0.791, P<0.001). Adverse interactions (interactions of types C and D, 3.7% of cases) were limited to patients receiving tenofovir disoproxil fumarate.ConclusionNonsteroidal anti-inflammatory medications should be used cautiously in elderly patients with chronic hepatitis B treated with tenofovir disoproxil fumarate due to the increased risk of renal toxicity.

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