inappropriate use due to administration of expired MENQUADFI to patient with no reported adverse event; Initial information received on 24-Jan-2025 regarding an unsolicited valid non-serious case received from a other health professional. This case involves a 16 years old female patient to whom inappropriate use due to administration of expired Meningococcal A-C-Y-W135 (T Conj) Vaccine [Menquadfi] to patient with no reported adverse event. The patient’s past medical history, medical treatment(s), vaccination(s) and family history were not provided. Concomitant medications included Influenza vaccine (Fluzone). On 23-Jan-2025, the patient received a expired 0.5 ml dose of suspect Meningococcal A-C-Y-W135 (T Conj) Vaccine Solution for injection (strength: standard, frequency: once, expiry date: 31-Dec-2024 and lot U7540BD) via unknown route in the left arm as Immunization (expired product administered) (latency: same day). This suspected adverse reaction report is submitted and classified as a medication error solely and exclusively to ensure the marketing authorization holder’s compliance with the requirements set out in the Directive 2001/83/EC and Module VI of the Good Pharmacovigilance Practices. The classification as a medical error is in no way intended, nor should it be interpreted or construed as an allegation or claim made by the marketing authorization holder that any third party has contributed to or is to be held liable for the occurrence of this medication error.