developed a rapid heartrate; When she got home and was doing regular stuff, it started pounding.; she could not sleep; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP and Other HCP) from medical information team. The reporter is the patient.  A 64 year-old female patient received bnt162b2 (BNT162B2), administration date 24Sep2021 (Lot number: ER8731, Expiration Date: 31Oct2021) at the age of 64 years as dose 1, single for covid-19 immunization. The patient had no relevant medical history. There were no concomitant medications. The following information was reported: HEART RATE INCREASED (non-serious) with onset 24Sep2021, outcome "recovering", described as "developed a rapid heartrate"; PALPITATIONS (non-serious) with onset 24Sep2021, outcome "recovering", described as "When she got home and was doing regular stuff, it started pounding."; INSOMNIA (non-serious) with onset 24Sep2021, outcome "unknown", described as "she could not sleep". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of heart rate increased, palpitations, insomnia.  Additional information: Patient received her first dose of the Pfizer-BioNTech Covid-19 vaccine on Friday and Five hours after receiving it, she developed a rapid heartrate. She stayed there longer, stayed there and after not quite a half hour she drove home, but when that hit her, it scared her because she was alone. She stated she talked to a friend that is a nurse and she said maybe it put her in tachycardia, but she didn't diagnose her. She explained it was just your heart going into a rapid heartbeat and she said it was okay to not go into the hospital. She stated it eased her up a little thinking she wasn't going to have a heart attack, because that is what she thought. She felt like she was going to have a heart attack, like her heart was going to wear out. It was not just a normal beat; it was like rapid beat and that scared her. She stated it was a Saturday, so she didn't want to call us. She felt better today but her heartbeat is beating faster than normal. She stated she has "always had a low heartbeat of 70 over 120. It was always 118 or 120 on top and 70 on the bottom." She was concerned she was going to have a fast heartrate from now on and it whether it would wear her heart out and it scared her. Or maybe whether it was just a reaction. . It felt like her heart was beating out of her chest, like she had 10 cups of coffee. It did not stop. It continued until midnight or 2am. She kept getting up and drinking more water and going back to bed, thinking it would help to be hydrated. She was not dehydrated. The next day, she continued to have fast heart beat. She never experienced this before and now she feels it. She was afraid she would call 911, but did not. She read the literature and it said rapid heartbeat and pounding heart on there, but it got better the next day. Now it has been 2 days since receiving it and it has improved. She is going to report this to her doctor as soon as she hangs up. She does not know what to do about second dose and is concerned that it will be worse. She did not want to go to the hospital because she is self-pay. She wanted to know if this was something that will stay with her or not. She was fine when she first got it. When she got home and was doing regular stuff, it started pounding. She did not do anything to exert herself, and it kept doing it. When she went to sleep, it kept pounding and pounding and she could not sleep. She called nurse to ask her. She said it could have sent her into tachycardia. She asked was Tachycardia when you have a rapid heartbeat. The pamphlet she read also said it is usually a symptom with second dose. Now she is afraid to get second dose. She wanted to know if there have been reports of people having it after first dose. She stated she has an allergy to sulfa, and she did not see that anything had sulfa in it so that is why she got this one. Initially it was occurred 6 years ago. It was an antibiotic, and she broke out around clothing line. Second time was 4 years later. She took one dose and woke up with eyes swollen. Unknown name of medication for both Sulfa drugs. She then said the first one was 35 years ago and second one was 10 or more years after that. Unknown manufacturer, dose, lot and expiration for either Sulfa product. This report is not related to a study or programme. Time of the Vaccination Was Given at 13:00-14:00 and the vaccine was administered at Clinic. Patient had no previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available). No Additional Vaccines Administered on Same Date of the Pfizer Suspect. The patient didn't receive any other vaccines within 4 weeks prior to the COVID vaccine. No adverse events were occurred with the prior vaccinations. The adverse events not required to visit Physician Office and emergency room visit. There is no Family Medical History Relevant to Adverse events. No follow-up attempts are possible. No further information is expected.