Elevated heartbeat; feeling dizzy (woozy); drop in her blood pressure; not feeling good/Felt kind of off/Felt sort of strange; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient. An 86-year-old female patient received bnt162b2 omi xbb.1.5 (COMIRNATY (2023-2024 FORMULA)), on 25Sep2023 as dose 5 (booster), single (Lot number: HF927S) at the age of 86 years, in right arm for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: bnt162b2 (DOSE 1, SINGLE, Time: Unknown , Anatomical Site of injection: Unknown , Route of Administration: intramuscular, Batch/Lot number: EL9261), administration date: 21Jan2021, when the patient was 83-year-old, for COVID-19 immunization, reaction(s): "No reactions at all"; bnt162b2 (DOSE 2, SINGLE, Time: Unknown , Anatomical Site of injection: arm unknown , Route of Administration: intramuscular, Batch/Lot number: EN9581), administration date: 11Feb2021, when the patient was 83-year-old, for COVID-19 immunization, reaction(s): "No reactions at all"; bnt162b2 (DOSE 3 (BOOSTER), SINGLE, Time: Unknown, Anatomical Site of injection: arm unknown , Route of Administration: intramuscular, Batch/Lot number: FC3183), administration date: 04Oct2021, when the patient was 84-year-old, for COVID-19 immunization, reaction(s): "No reactions at all"; Covid-19 vaccine (Booster Dose 4 (other): was the next one that they suggested, manufacturer unknown), for COVID-19 immunization, reaction(s): "No reactions at all". The following information was reported: FEELING ABNORMAL (non-serious) with onset 27Sep2023, outcome "not recovered", described as "not feeling good/Felt kind of off/Felt sort of strange"; BLOOD PRESSURE DECREASED (non-serious) with onset 27Sep2023 at 10:30, outcome "not recovered", described as "drop in her blood pressure"; DIZZINESS (non-serious) with onset 27Sep2023 at 12:00, outcome "not recovered", described as "feeling dizzy (woozy)"; HEART RATE INCREASED (non-serious) with onset 27Sep2023 at 12:30, outcome "not recovered", described as "Elevated heartbeat". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of blood pressure decreased, heart rate increased. Therapeutic measures were taken as a result of dizziness, feeling abnormal. Additional information: The patient had no other conditions and no other products. The reporter clarified this is her fifth dose. She called about the Pfizer Immunization vaccine (recent). Just had it on Monday. Her blood pressure has been consistent all her life. Feeling dizzy. Took her blood pressure yesterday (started yesterday 27Sep2023) and today because she was not feeling good. She was concerned because she never had a drop in her blood pressure ever. She was presuming she still has it, the last time checked it was 105/64. Continues to be low. Not really. It did go on for quite a while. She took a nap so that she could feel better. She ignored it the rest of the day. Today, the same thing happened again and she thought that she had better check. Thought that she would try again. Started out at 99/58 about an hour ago. Later stated that there was no treatment because she never needed it before. Called her daughter and decided to call Pfizer because they needed to know if anyone has this problem with Covid. Blood pressure is usually 126/80. Thought this was concerning. Mentioned that she felt woozy all day, not fainting woozy but just strange. Started yesterday 27Sep2023. Felt kind of off did not want to go outside or anywhere like a feeling she should stay put. Felt sort of strange for rest of the day. Is ongoing. Is feeling strange like would fall down. Is about the same. When happened today thought would call and report it with vaccine, someone else may be reporting it also. Treatment: drank more water about 1/2 hour to 45 minutes ago. Elevated heartbeat, her heartbeat sitting down was 88, 90, 85. Has never been below 80. She always had a very normal heartbeat. She has had all Covid vaccines up to this point. She went and got this one. Never had a problem with any vaccination or anything. Is 86. Started yesterday 27Sep2023. Is ongoing. Persisting. Last test she was up to 85. She would put it all together with her blood pressure. No treatment, just figured she would try to check it again. She clarified there were no issues with heartbeat was no flutter or anything, thought that it was a little high. Checked website for normal reactions to vaccine and lowered blood pressure was not listed. Will call her doctor and thought that she would go see him or go to emergency room. Wanted to know if there were any reports of reactions like this since the new Covid vaccine. She did not have this with the other injections. No reactions at all. It may not be the shot but she had just had it and never had anything like this happen.