pregnant patient came into the clinic wanting to receive boostrix, however the patient was administered tenivac instead with no reported adverse event; pregnant patient came into the clinic wanting to receive boostrix, however the patient was administered tenivac instead with no reported adverse event; Initial information received on 05-Jul-2023 regarding an unsolicited valid  non-serious case received from a pharmacist.  This case involves an unknown age female patient who was pregnant and was exposed to Diphtheria-2/Tetanus-5 Adsorbed Toxoids No Preservative Adult [Tenivac] and Diphtheria Vaccine Toxoid, Pertussis Vaccine Acellular 3-Component, Tetanus Vaccine Toxoid (Boostrix).  Data regarding this pregnancy were received prospectively, i.e. before pregnancy outcome was known.   The date of last menstrual period was not reported. The estimated due date was not reported. The patient's past medical history, medical treatment(s), vaccination(s) and family history were not provided. The patient had unknown previous pregnancy/ies.   On an unknown date, the patient received 0.5 ml of suspect Diphtheria-2/Tetanus-5 Adsorbed Toxoids No Preservative Adult Suspension for injection (lot number: U7745AA; Expiry date: 20-May-2024) (Frequency: Once; Strength: Standard) via intramuscular route in the right side (Site unspecified) for immunization.  On an unknown date, the patient received an unknown dose of suspect Diphtheria Vaccine Toxoid, Pertussis Vaccine Acellular 3-Component, Tetanus Vaccine Toxoid not produced by Sanofi Pasteur (with an unknown formulation, strength, expiry date and lot number) via unknown route in unknown administration site for prophylactic vaccination (Immunisation).  On an unknown date, the pregnant patient came into the clinic wanting to receive Diphtheria Vaccine Toxoid, Pertussis Vaccine Acellular 3-Component, Tetanus Vaccine Toxoid, however the patient was administered Diphtheria-2/Tetanus-5 Adsorbed Toxoids No Preservative Adult instead with no reported adverse event (exposure during pregnancy) (wrong product administered) (latency: same day).  It was reported, calling on behalf of patient regarding administration of Tenivac. Caller stated that she has questions regarding the administration of Tenivac and another product for a pregnant patient. Caller states that a pregnant patient came into the clinic wanting to receive Boostrix, however the patient was administered TENIVAC instead. Caller would like to know if there is a minimum time interval before Tdap can be administered? Caller would like to know if there is any concern for fetal toxicity/harm with receiving two doses of diphtheria and tetanus?   Action taken: not applicable for both suspects  Outcome: Unknown   Additionally, at time of reporting, the outcome of the pregnancy is unknown.   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.