tightness in her throat; dealing with reflux at that time; voice got really hoarse; she did a lot of coughing; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 83 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 20Jan2021 (Lot number: EL9261) at the age of 82 years as dose 1, single and administered in arm right, administration date 10Feb2021 (Lot number: EN6201) as dose 2, single for covid-19 immunisation. Relevant medical history included: "Blood clots" (unspecified if ongoing); "Deep vein thrombosis" (unspecified if ongoing). Concomitant medication(s) included: COUMADIN taken for thrombosis, deep vein thrombosis (ongoing); FLU taken for immunisation. The following information was reported: THROAT TIGHTNESS (non-serious) with onset 2021, outcome "recovered" (2021), described as "tightness in her throat"; GASTROOESOPHAGEAL REFLUX DISEASE (non-serious) with onset 2021, outcome "recovered" (2021), described as "dealing with reflux at that time"; DYSPHONIA (non-serious) with onset 2021, outcome "recovered" (2021), described as "voice got really hoarse"; COUGH (non-serious) with onset 2021, outcome "recovered" (2021), described as "she did a lot of coughing".  Additional information: She had been talking to her doctor off and on and she is not being much help. The doctor this morning said to take Metamucil and her Imodium. The only medication that she is on is Coumadin and she has been on that for years due to blood clots, deep vein thrombosis. The patient received Pfizer COVID vaccine (Lot Number: 30155BA) administered in left arm in the afternoon as dose 3, single for covid-19 immunization. She had symptoms after her booster shot which she had in 06Oct2021. She has had severe diarrhoea and it's still ongoing. She had been taking Imodium and Pepto-Bismol for it and it will slow it down but when she goes off the medication the diarrhoea comes back and gets watery and forceful. She then would take antidiarrhea medication and it would settle it down and then she would have another rebound and twice she threw up with it. That began shortly after the booster, about a week after the booster shot if she remembers right. Inquired for outcome of the diarrhoea and she stated that she would say it's not as bad as the first two bouts were that she had where she did the throwing up. She had been watching what she eats and is trying to drink the electrolytes to keep her energy up, because that takes a lot out of a person, and then she will go 3 to 4 days and she was fine and then it would start up again. She would say that sometimes she could go about a week between bouts and usually that's when she was taking the Pepto-Bismol for it. She clarified that the throwing up was in the later part of Oct2021 and she has not had any more of that since then. Product clarified to the booster dose of the Pfizer COVID vaccine. Prior Vaccinations (within 4 weeks) included Flu shot in left arm on an unspecified date. No additional vaccines administered on same date of the Pfizer suspect. Adverse event did not require a visit to Emergency Room/Physician Office. She had her flu shot between her 2nd dose of the Pfizer COVID vaccine and her booster dose of the Pfizer COVID vaccine, but she doesn't remember the exact day. She thinks that it was maybe 2 weeks before her booster dose. Patient's Medical History (including any illness at time of vaccination) adverse events following prior vaccinations, Family Medical History Relevant to adverse events and relevant tests were reported as none. She is also just wondering if this will eventually disappear or how long will it last? With the throat thing that lasted she supposes over a month and that's well cleared up and she is wondering how long should she expect to have the diarrhoea go? Will it slowly wear out? She mentioned that she has been taking Imodium (Lot Number: P125656; Expiry Date: Jun2024) and Pepto-Bismol for her adverse events.  No follow-up attempts are possible. No further information is expected.