Diarrhea; Received the Pfizer Covid bivalent vaccine and flu shot (Fluzone) on the same day; Received the Pfizer Covid bivalent vaccine and flu shot (Fluzone) on the same day; Weight: He went to the doctor the other day, this was after the diarrhea was ongoing for a few days but he is down to 185lbs, prior to the diarrhea he was 195lbs or 197lbs; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID. The reporter is the patient.  A 74-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 28Sep2022 as dose 5 (booster), single (Batch/Lot number: unknown) at the age of 74 years for covid-19 immunisation; influenza vaccine (FLUZONE [INFLUENZA VACCINE]), on 28Sep2022 as dose number unknown, single (Batch/Lot number: unknown) for immunisation. The patient's relevant medical history included: "Hay fever" (unspecified if ongoing); "Allergies: Pollen" (unspecified if ongoing); "Allergies: Ragweed" (unspecified if ongoing). There were no concomitant medications. Vaccination history included: BNT162b2 (Dose 1, Lot: ER2613), administration date: 19Mar2021, when the patient was 73-year-old, for COVID-19 Immunization; BNT162b2 (Dose 2, Lot: EW0162), administration date: 12Apr2021, when the patient was 73-year-old, for COVID-19 Immunization; BNT162b2 (Dose 3 (Booster), Lot: FG3527), administration date: 06Dec2021, when the patient was 73-year-old, for COVID-19 Immunization; BNT162b2 (Dose 4 (Booster), Lot: FJ4969), administration date: 06Jun2022, when the patient was 74-year-old, for COVID-19 Immunization; Small pox vaccine (Back in the 50's), for Immunization, reaction(s): "Didn't cause any side effects". The following information was reported: WEIGHT DECREASED (non-serious) with onset 2022, outcome "unknown", described as "Weight: He went to the doctor the other day, this was after the diarrhea was ongoing for a few days but he is down to 185lbs, prior to the diarrhea he was 195lbs or 197lbs"; OFF LABEL USE (non-serious), PRODUCT USE ISSUE (non-serious) all with onset 28Sep2022, outcome "unknown" and all described as "Received the Pfizer Covid bivalent vaccine and flu shot (Fluzone) on the same day"; DIARRHOEA (non-serious) with onset 29Sep2022 at 05:00, outcome "not recovered", described as "Diarrhea". The event "diarrhea" required physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of diarrhoea.  Additional information: Patient had blood test on 17Sep2022 prior to the diarrhea and the doctor said his blood work is almost perfect and he is in good shape. He described himself as being very active and busy, he sees the doctor once a year, he's had EKG's and all tests. He was asking the typical amount of time that the diarrhea would last. He did contact his family physician and made an appointment. His physician told him there is nothing wrong with getting both shots at the same time, his doctor got them at the same time and had no reactions. His doctor told him to take Imodium AD, and change his diet, to only eat solid foods, so he is eating rice and blueberries to help his flora in the stomach but he still has diarrhea, nothing has worked much, the Imodium AD will stop the diarrhea, but as soon as he gets off of it, his diarrhea is back. The first night he got up 7 times to go to the bathroom, then last night it was 3 times, he is 74 and in good shape, with a good heart and good blood pressure, if anything he feels like he is 40, he wishes he could have just caught the flu instead of experiencing this. He is also calling the gastrologist and has an appointment to see them on 03Nov2022, he mentioned that he will probably be dead by then with all this diarrhea. He doesn't know why this happened, but this is going to be his last flu shot, he didn't want to take a chance.  The information on the batch/lot number for BNT162b2, BNT162b2 omi ba.4-5 has been requested and will be submitted if and when received.