Tachycardia (HR of 120 - 140 bpm for 12 hours); which was worse after doses 3 and 4; Administration date=17Sep2022, dose number=4 / other vaccine same date product=flu shot, other vaccine same date vaccine date=17Sep2022; Administration date=17Sep2022, dose number=4 / other vaccine same date product=flu shot, other vaccine same date vaccine date=17Sep2022; This is a spontaneous report received from a non-contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 56-year-old female patient (not pregnant) received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 17Sep2022 as dose 4 (booster), single (Batch/Lot number: unknown) at the age of 56 years, in left arm for covid-19 immunisation; influenza vaccine (INFLUENZA VACCINE), on 17Sep2022 as dose 3, single (Batch/Lot number: unknown), in right arm for immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: BNT162b2 (Dose Number: 3, Batch/Lot No: Unknown. Not available/provided to reporter at the time of report completion, Location of injection: Arm Left), administration date: 13Nov2021, when the patient was 55-year-old, for COVID-19 immunization, reaction(s): "Tachycardia (HR of 120 - 140 bpm for 12 hours)", "Prev dose administration date=13Nov2021, Prev dose dose number=3/ other vaccine 4weeks product=Flu Shot, Other vaccine 4weeks vaccine date=13Nov2021", "which was worse after doses 3 and 4"; flu vaccine (Dose 2, Other vaccine 4weeks product=Flu shot, Other vaccine 4weeks vaccine location=right arm), administration date: 01Sep2022, when the patient was 56-year-old, for Immunization; flu vaccine (Dose 1, Other vaccine 4weeks product=Flu Shot, Other vaccine 4weeks vaccine location=right arm), administration date: 13Nov2021, when the patient was 55-year-old, for Immunization, reaction(s): "Prev dose administration date=13Nov2021, Prev dose dose number=3/ other vaccine 4weeks product=Flu Shot, Other vaccine 4weeks vaccine date=13Nov2021"; Bnt162b2 (Dose Number: 1), administration date: 2021, for COVID-19 immunization, reaction(s): "Tachycardia (HR of 120 - 140 bpm for 12 hours)"; Bnt162b2 (Dose Number: 1), for COVID-19 immunization, reaction(s): "Tachycardia (HR of 120 - 140 bpm for 12 hours)"; Bnt162b2 nos (DOSE 2), for COVID-19 immunization, reaction(s): "Tachycardia (HR of 120 - 140 bpm for 12 hours)". The following information was reported: TACHYCARDIA (medically significant), outcome "unknown", described as "Tachycardia (HR of 120 - 140 bpm for 12 hours)"; CONDITION AGGRAVATED (non-serious), outcome "unknown", described as "which was worse after doses 3 and 4"; OFF LABEL USE (non-serious), PRODUCT USE ISSUE (non-serious), outcome "unknown" and all described as "Administration date=17Sep2022, dose number=4 / other vaccine same date product=flu shot, other vaccine same date vaccine date=17Sep2022". The patient underwent the following laboratory tests and procedures: Heart rate: 120 - 140 bpm.  Additional information: Tachycardia (HR of 120 - 140 bpm for 12 hours) the day after all 4 doses of the Pfizer covid-19 vaccine, which was worse after doses 3 and 4. I had the flu shot on the same day as dose 3 in Nov2021. I had the flu shot 01Sep2022, 16 days before I had dose 4 of the Pfizer covid vaccine (17Sep2022) and had tachycardia that was worse (more rapid HR and lasted longer) than after dose 3. Yes other vaccine in four weeks. No covid prior vaccination and no covid tested post vaccination.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.