Quadruple bypass; Thrombocytopenia; expired product administered; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP).  A 76-year-old male patient received BNT162b2 (BNT162B2), on 30Sep2021 as dose 3 (booster), 0.3 ml single (Lot number: FF2589, Expiration Date: 31Mar2021) at the age of 76 years intramuscular, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Rt side carotid artery-100% blocked", start date: Nov2020 (ongoing), notes: cardiac stress test and echocardiogram both normal, collateral circulation; "Mini-stroke", start date: 17Sep2021, stop date: 18Sep2021, notes: Pertinent details: Retina doctor said not an ocular stroke. The patient's concomitant medications were not reported. Vaccination history included: BNT162b2 (Dose 1,Single, Anatomical Site of injection: Left Arm, Route of Administration: Intramuscular, Batch/Lot number: EL3249), administration date: 19Jan2021, for Covid-19 immunization; BNT162b2 (Dose 2, Single, Left Arm, Route of Administration: Intramuscular, Batch/Lot number: EL9266), administration date: 21Feb2021, for COVID-19 immunization, reaction(s): "mini-stroke", "Rt eye lens replaced", "Lt eye lens replaced", "lost vision in 1/2 of Rt eye". The following information was reported: EXPIRED PRODUCT ADMINISTERED (non-serious) with onset 30Sep2021, outcome "unknown"; THROMBOCYTOPENIA (hospitalization, medically significant, life threatening) with onset 29Nov2021, outcome "recovering"; CORONARY ARTERY BYPASS (hospitalization, medically significant, life threatening) with onset 02Dec2021, outcome "recovered" (06Dec2021), described as "Quadruple bypass". The patient was hospitalized for coronary artery bypass, thrombocytopenia (hospitalization duration: 5 day(s)). The events "quadruple bypass" and "thrombocytopenia" required emergency room visit. The patient underwent the following laboratory tests and procedures: Blood test: (17Sep2021) Mini Stroke, notes: Mini Stroke; (29Nov2021) Failed; (01Dec2021) Failed; Cardiac stress test: (29Nov2021) Failed; Computerised tomogram: (17Sep2021) Mini stroke, notes: Mini Stroke; CSF culture: (unspecified date) Unknown, notes: Unknown; Culture: (unspecified date) Unknown, notes: Unknown; Culture urine: (unspecified date) Unknown, notes: Unknown; Echocardiogram: (29Nov2021) Failed; Magnetic resonance imaging: (17Sep2021) Mini stroke, notes: Mini Stroke. Therapeutic measures were taken as a result of coronary artery bypass, thrombocytopenia. Patient received treatment with Toprol plus Diet, Cardiac, Hematology consult, GI consult  Clinical Information:  Vaccine: Covid-19 Vaccine (Pfizer-Biontech) 3rd Dose dose 3 (booster), 0.3 ml single (Lot number: FF2589, Location: Left Deltoid) Date given: 30Sep2021 Exp. Date: 31Dec2021 Lime green sticker stated Exp. Date as 31Mar2021  Reporter stated, The patient had to have emergency Quadruple cardiac Bi-pass. When he went to (Facility name withheld) where the shot was given they said Pfizer gave them permission to use vaccine 6 months after expiration date. When he asked for something in writing from Pfizer, they couldn't find anything. Then they printed attached copy that says drug expired 31Dec2021. When he called Pfizer Drug Customer Service they said drug expired 31Mar2022. When he called Pfizer Medical Infusion they said that lot # was manufactured in Jul2021 and expired 31Mar2022. As you can see that's 3 different expiration dates. he went to know the exact expiration date, if expired when he got it-could it have caused my emergency heart surgery? If expired-do he need another booster? If expiration date was wrong-How do he get my shot record corrected.