A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022; Inappropriate schedule of vaccine administered; No adverse event; A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022; This spontaneous case was reported by an other health care professional and describes the occurrence of EXPIRED PRODUCT ADMINISTERED (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), PRODUCT STORAGE ERROR (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Inappropriate schedule of vaccine administered) and NO ADVERSE EVENT (No adverse event) in an 82-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 014F21A, 030L20A and 025L20A) for COVID-19 prophylaxis.     No Medical History information was reported.   On 11-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 08-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 28-Oct-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 26-Jul-2022, received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 26-Jul-2022, the patient experienced EXPIRED PRODUCT ADMINISTERED (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022). On an unknown date, the patient experienced PRODUCT STORAGE ERROR (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Inappropriate schedule of vaccine administered) and NO ADVERSE EVENT (No adverse event). At the time of the report, EXPIRED PRODUCT ADMINISTERED (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), PRODUCT STORAGE ERROR (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Inappropriate schedule of vaccine administered) and NO ADVERSE EVENT (No adverse event) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessments were provided for EXPIRED PRODUCT ADMINISTERED (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022), PRODUCT STORAGE ERROR (A pharmacy staff reports that they inadvertently administered 51 doses of the monovalent vaccines/ expiration date 13Jul2022 Date(s) of administration of vaccine were -26Jul2022) and INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (Inappropriate schedule of vaccine administered).    Concomitant product use was not provided by the reporter.  Treatment information was not provided.   This case was linked to US-MODERNATX, INC.-MOD-2023-704260 (Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-704260:(Master case)