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The financial support by Agenzia Italiana del Farmaco (AIFA) and Regione Lombardia (ViGer Project, Vigilanza in Geriatria) is gratefully acknowledged.
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Paolo Pellegrino and Carla Carnovale contributed equally to the work.
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Pellegrino, P., Carnovale, C., Borsadoli, C. et al. Two cases of hallucination in elderly patients due to a probable interaction between flu immunization and tramadol. Eur J Clin Pharmacol 69, 1615–1616 (2013). https://doi.org/10.1007/s00228-013-1517-5
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DOI: https://doi.org/10.1007/s00228-013-1517-5