No adverse event; Nurse calling to report inadvertently administering an expired dose of PNEUMOVAX 23. vaccine expired on 11/22/2024 and was administered on 1/22/2025.; This spontaneous report was received from a Licensed Practical Nurse regarding a patient of unknown age and gender. The patient’s medical history, concurrent conditions, concomitant therapies, past drug reactions and allergies were not reported. On 22-JAN-2025, the patient was inadvertently vaccinated with an expired dose of pneumococcal 23v polysaccharide vaccine (PNEUMOVAX23) injection, prefilled syringe, administered for prophylaxis (lot number X014729 has been verified to be a valid number for pneumococcal 23v polysaccharide vaccine [PNEUMOVAX23], expiration date 22-NOV-2024; dose, anatomical site of injection and route of administration were not provided) (Expired product administered). It was reported that the product did not underwent temperature excursion. No additional information or adverse event was reported for the patient.