Original Article No signal of interactions between influenza vaccines and drugs used for chronic diseases: a case-by-case analysis of the vaccine adverse event reporting system and vigibase Carla Carnovale1*, Emanuel Raschi2*, Luca Leonardi2, Ugo Moretti3, Fabrizio De Ponti2, Marta Gentili1, Marco Pozzi4, Emilio Clementi4,5, Elisabetta Poluzzi2§ and Sonia Radice1§ 1 Unit of Clinical Pharmacology Department of Biomedical and Clinical Sciences L. Sacco, “Luigi Sacco” University Hospital, Università di Milano, 20157 Milan, Italy. 2 Pharmacology Unit, Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Via Irnerio 48, 40126, Bologna, BO, Italy. 3 Dept. of Diagnostics and Public Health, Section of Pharmacology, University of Verona, Verona, Italy. 4 Scientific Institute, IRCCS E. Medea, Bosisio Parini LC, Italy. 5 Clinical Pharmacology Unit, Department Biomedical and Clinical Sciences, CNR Institute of Neuroscience, L. Sacco University Hospital, Università di Milano, Milan, Italy. *Carla Carnovale and Emanuel Raschi contributed equally to this work §Sonia Radice and Elisabetta Poluzzi jointly directed this work. *Corresponding author: Emilio Clementi, Department of Biomedical and Clinical Sciences, Università di Milano Via GB Grassi, 74 - 20157 Milan, Tel: +39.02.50319643. Fax: +39.02.50319682 e-mail:
[email protected] 1 ABSTRACT Background: An increasing number of reports indicates that vaccines against influenza may interact with specific drugs via drug metabolism. To date, actual impact of vaccine-drug interactions observed in the real world clinical practice has not been investigated. Research design and methods: From VAERS and VigiBase, we collected Adverse Event Following Immunization (AEFI) reports for individuals receiving vaccines against influenza recorded as suspect and selected cases where predictable toxicity was recorded with oral anticoagulants, antiepileptics and statins (i.e., hemorrhages, overdosage and rhabdomyolysis, respectively).