she was a little bit stressed; if she would be able to sleep with the heart beating as hard as it was. She didn't go to bed until after 2am; allergic person; heart beating really hard like she ran up and down the stairs; This is a spontaneous report from a contactable consumer (patient). A 60-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Lot number: EW0158, expiry date: Jul2021, NDC number: unknown) via an unspecified route of administration in Arm Left (shoulder) on 22Apr2021 at 13:00 as dose 1, single for so she don't get the virus, she is trying to stay alive. The patient family medical history included heart problems (Grandfather had heart problems in his 80's, but generally no heart problems in her family) and concomitant medications included calcium citrate, colecalciferol (CITRACAL-D) 1 tablet in morning and 1 tablet at night taken (Takes at 8 am and at dinner) for routine health maintenance; ascorbic acid, betacarotene, biotin, calcium pantothenate, calcium phosphate dibasic, chromium picolinate, colecalciferol, cupric oxide, cyanocobalamin, ferrous fumarate, folic acid, magnesium oxide, manganese amino acid chelate, nicotinamide, phytomenadione, potassium iodide, potassium sulfate, pyridoxine hydrochloride, retinol palmitate, riboflavin, selenomethionine, thiamine hydrochloride, tocopheryl acid succinate, zinc oxide (MULTI VITAMIN ONE A DAY) 1 tablet in evening (one a day with food around 5 or 6 in the evening) taken for nutritional supplementation for both start and stop date were not reported. The patient did not take Vaccine at Military Facility. The patient had no history of all previous immunization with the Pfizer vaccine considered as suspect. Did not take Prior Vaccinations (within 4 weeks) prior to the first administration date of the suspect vaccine. The patient did not require a visit to Emergency Room due to events. On an unspecified date, the patient underwent heartbeat result: 60/min; it was not rapid. The patient stated that on 22Apr2021 around 1pm her heart started beating really hard as if she had been running up and down stairs at least 3 or 4 times. Her heart started beating really hard when she was still at the vaccination site and it lasted 12 hours or 13 hours until about 2am on 23Apr2021 and. She took her pulse and it was not rapid, It did not go away for 12 hours. She sat at the vaccination site for 35 minutes and she was a little bit stressed. so she went home and sat dead still for 2 hours without moving and her heart was just banging away in her chest, it was unrelenting. She called my doctor and they said if she had any more symptoms to go to the walk-in clinic. She did not have any of the other symptoms, but she was trying to report on the other system and she just can't get through on the phone. She wanted to let us know that it lasted for 12 hours and it didn't matter what she was doing or not doing, and it scared her. She did not have shortness of breath and was able to drive herself home and was not dizzy. The intensity of the beating is very concerning. She is a very allergic person, and her doctor gave her the go ahead and it was nothing else, her throat wasn't swelling, just the intense beating of her heart, she called the doctor because the heartbeat didn't slow down or was not getting any less, and she didn't know if she should go see someone. She was told if she was not experiencing any respiratory problems or dizzy and did not have any other adverse conditions that she should stay hydrated and rest. They said if any other symptoms showed up, she should go to the walk-in clinic. She didn't have any caffeine or anything because she didn't know if it would make her heart worse and she didn't know if she would be able to sleep with the heart beating as hard as it was. She didn't go to bed until after 2am and by then it had subsided, she was very healthy, did not have high blood pressure and nor was overweight, or high cholesterol. She reported she had her annual physical in Dec (unspecified date) and she has no health problems. She doesn't take medications except multivitamins, so no drug interactions. She walks 1 1/2-2 hours 3 times a week and eats low-fat, low-salt, no meat diet. The outcome of the event of heart beating really hard like she ran up and down the stairs was recovered on 23Apr2021, while for other events was unknown.  No follow-up attempts are possible. No further information is expected.