racing fast heart beat that goes up to 150-170; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 74 year-old female patient received bnt162b2 (BNT162B2), administration date 28Oct2021 (Lot number: 30135BA) as dose 3 (booster), single for covid-19 immunisation.  Relevant medical history included: "Hypertension" (unspecified if ongoing), notes: Blood pressure high diagnosed in the '90s. Concomitant medication(s) included: BYSTOLIC (manufactured by Abbvie, exp date 25Oct2022) 10 mg, 1x/day at night taken for hypertension; AMLODIPINE 5 mg, 1x/day in the morning taken for hypertension, start date: 2021. Vaccination history included: Bnt162b2 (1st dose. NDC: not provided, LOT: ER8733, and EXP date: 31Jul2021), administration date: 01Apr2021, when the patient was 74 years old, for Covid-19 immunization, reaction(s): "she didn't have a reaction"; Bnt162b2 (2nd dose, LOT: ER8733, no NDC provided, EXP date: 31Jul2021), administration date: 2021, for COVID-19 immunization, reaction(s): "she didn't have a reaction". The following information was reported: HEART RATE INCREASED (medically significant) with onset Nov2021, outcome "not recovered", described as "racing fast heart beat that goes up to 150-170". The patient underwent the following laboratory tests and procedures: heart rate: (unspecified date) 150, notes: though it was down to 150; (unspecified date) 124, notes: that time it was 124, that was the 8th time it happened; (unspecified date) result not reported; (unspecified date) result not reported; (unspecified date) result not reported; (2018) 180, notes: her heart at resting was 180bpm; (Nov2021) 170, notes: she has been kind of scared for 7 days later her heart rate to be up to 170,; (24Jan2022) 165. The clinical course of events was as follows: Patient had no reaction to the first two doses, but the third, her booster, after that she had a racing fast heart beat that goes up to 150-170. She got her booster 28Oct2021 and 7 days later the racing heart beat happened, and it has happened 8 times, she was waiting for it to go away. She hasn't had the rapid heart rate since she was in the hospital in 2018, when they woke her up and said her heart at resting was 180bpm. She has been taking the Bystolic at night, she was taking in the day, in the morning, she has been taking it for probably years, before having the rapid heart rate. She has no new medications, the only other thing that was newer was her Amlodipine she also takes for high blood pressure, which was borderline, and started last year (2021). Since she has taken Bystolic at night she had not racing heartbeat anymore, so she has been kind of scared for 7 days later her heart rate to be up to 170, though it was down to 150 just the one time. It went for 5 minutes, the longest was 5 minutes, that time it was 124, that was the 8th time it happened. She thought it was gonna go away but it didn't.  Her fast pulse happened 8 times, she wrote down when it happened so she has the dates (not reported). Her treatment for the fast heart rate was that she coughed and pressed down like she was having a baby which was what she was told to do while she was at the hospital and they woke her up. This time when it happened she was sitting down watching TV and all of a sudden it was wonky. The last time when she thought it was going to go away was on 24Jan2022, and lasted about 5 minutes and her pulse got up to 165. Her husband bought her a Kardia machine that you put two fingers in on the things and it records heart beat and tells if you are having A-fib, bradycardia, or tachycardia, but she was not having any of these. The rapid heart rate has happened 8 times in 3 months, that's it.  This report was not related to a study or programme. Follow-up attempts are completed. No further information is expected.