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Stefano Fagiuoli,1 Pierluigi Toniutto,2 Nicola Coppola,3 Domenica Daniela Ancona,4 Margherita Andretta,5 Fausto Bartolini,6 Fulvio Ferrante,7 Alessandro Lupi,8 Stefano Palcic,9 Francesca Vittoria Rizzi,10 Davide Re,11 Gema Alvarez Nieto,12 Candido Hernandez,13 Francesca Frigerio,14 Valentina Perrone,14 Luca Degli Esposti,14 Alessandra Mangia15 1Department of Medicine and Surgery, University of Milan Bicocca & Gastroenterology Hepatology and Transplantation Unit, ASST Papa Giovanni XXIII, Bergamo, Italy; 2Hepatology and Liver Transplantation Unit, Azienda Ospedaliero Universitaria, Udine, Italy; 3Infectious Diseases Unit, University of Campania L. Vanvitelli, Naples, Italy; 4Dipartimento Farmaceutico ASL BAT, Trani, Italy; 5UOC Assistenza Farmaceutica Territoriale, Azienda Ulss 8 Berica, Vicenza, Italy; 6Dipartimento Farmaceutico-Usl Umbria 2, Terni, Italy; 7Dipartimento Diagnostica Ed Assistenza Farmaceutica – ASL Frosinone, Frosinone, Italy; 8Struttura Complessa Di Cardiologia – ASL VCO, Omegna, Italy; 9Farmaceutica Territoriale- Azienda Sanitaria Universitaria Integrata Giuliano-Isontina (ASUGI), Trieste, Italy; 10UOS Farmacovigilanza e Monitoraggio Spesa Farmaceutica- ASL BAT, Trani, Italy; 11Servizio Farmaceutico Territoriale ASL Teramo, Teramo, Italy; 12Gilead Sciences, Medical Affairs Italy, Milan, Italy; 13Gilead Sciences, Global Medical Affairs, London, UK; 14Clicon S.r.l., Health Economics and Outcomes Research, Bologna, Italy; 15Gastroenterology and Transplant Hepatology, Papa Giovanni XXIII Hospital, Bergamo, 24127, ItalyCorrespondence: Luca Degli Esposti, CliCon S.r.l. Società Benefit, Health, Economics & Outcomes Research, Via Murri, 9, Bologna, 40137, Italy, Tel +390544 38393, Email luca.degliesposti@clicon.itPurpose: The study aims at investigating the impact of polymedication and aging in the prevalence of multiple drug-drug interactions (DDIs) on HCV patients treated with sofosbuvir/velpatasvir (SOF/VEL) or glecaprevir/pibrentasvir (GLE

Luca Degli Esposti,1 Chiara Veronesi,1 Domenica Daniela Ancona,2 Margherita Andretta,3 Fausto Bartolini,4 Alberto Drei,5 Alessandro Lupi,6 Stefano Palcic,7 Davide Re,8 Francesca Vittoria Rizzi,2 Elisa Giacomini,1 Valentina Perrone1 1CliCon S.r.l. Health, Economics & Outcomes Research, Bologna, Italy; 2Dipartimento Farmaceutico, ASL BAT, Trani, Italy; 3UOC Assistenza Farmaceutica Territoriale, Azienda ULSS 8 Berica, Vicenza, Italy; 4Dipartimento Farmaceutico, Umbria 2, Terni, 05100, Italy; 5Deloitte, Milano, Italy; 6Cardiology Unit, ASL VCO, Omegna, Italy; 7Farmaceutica Territoriale, Azienda Sanitaria Universitaria Integrata Giuliano-Isontina, Trieste, Italy; 8UOC Assistenza Farmaceutica Territoriale, ASL Teramo, Teramo, ItalyCorrespondence: Valentina Perrone, Clicon Srl, Health, Economics and Outcomes Research, Via Murri 9, Bologna, 40137, Italy, Tel +39 544 38393, Fax +39 544 212699, Email valentina.perrone@Clicon.itPurpose: This real-world study investigates the direct healthcare costs from the perspective of the Italian Healthcare National Service of experienced statin users according to their level of adherence to therapy and to their cardiovascular (CV) profile in Italian settings of outpatients clinical practice.Patients and Methods: A retrospective observational analysis was performed based on administrative databases covering approximately 6 million health-assisted individuals. Adult patients with statins prescription between January 2014 and December 2016 were screened, and first prescription within this period was the index date. Follow-up lasted 1 year after index date. Only patients receiving statins prior index date (experienced statin users) were included and distributed in clusters based on their CV profile. Adherence was calculated during follow-up as proportion of days covered (PDC) and classified in low adherence (PDC< 40%), partial adherence (PDC=40– 79%) and adherence (PDC≥ 80%). Mean direct healthcare costs of drugs, hospitalizations