administration of Infanrix instead of Boostrix to an adult patient; the administration of Infanrix instead of Boostrix to an adult patient; the administration of Infanrix instead of Boostrix to an adult patient; This non-serious case was reported by a other health professional via call center representative and described the occurrence of wrong vaccine administered in a 45-year-old male patient who received DTPa (Infanrix) (batch number Y7JC3, expiry date 07-SEP-2026) for prophylaxis. Co-suspect products included DTPa (Reduced antigen) (Boostrix) for prophylaxis. On 13-JAN-2025, the patient received Infanrix. On an unknown date, the patient received Boostrix. On 13-JAN-2025, immediately after receiving Infanrix and not applicable after receiving Boostrix, the patient experienced wrong vaccine administered (Verbatim: administration of Infanrix instead of Boostrix to an adult patient), adult use of a child product (Verbatim: the administration of Infanrix instead of Boostrix to an adult patient) and underdose (Verbatim: the administration of Infanrix instead of Boostrix to an adult patient). The outcome of the wrong vaccine administered, adult use of a child product and underdose were unknown. This report is made by GSK without prejudice and does not imply any admission or liability for the incident or its consequences. Additional Information: GSK Receipt Date: 13-JAN-2025 The medical assistance reported that the administration of Infanrix instead of Boostrix to an adult patient which led to wrong vaccine administered, adult use of a child product and underdose.