weakness; sweat; feverish; dizziness; hot flashes; This is a spontaneous report from a contactable consumer (patient) or other non hcp. A 44-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot Number: EL8982 and expiry date: unknown), dose 1 via an unspecified route of administration, administered in Arm Left on 21Jan2021 (age at vaccination: 44 years) at 12:24 as 1ST DOSE, SINGLE DOSE for covid-19 immunisation. The patient medical history and concomitant medications was not reported. There was no Additional Vaccines Administered on Same Date of the Pfizer Suspect. Prior Vaccinations (within 4 weeks prior to the first administration date of the suspect vaccine and Adverse events following prior vaccinations was reported as none. The Pertinent Details (include surgical procedures and dates) was reported as not applicable. There was no Family Medical History Relevant to Adverse events. On 21Jan2021, The patient experienced dizziness after a couple minutes of receiving the injection, hot flashes, broke out into a sweat which lasted about 15 minutes after receiving the first dose of the Pfizer COVID-19 vaccine and experienced weakness and felt that he had to roll down window, turn on AC, drink water and felt whole car spinning and experienced feverish. It did clear up before he left, however he felt dizzy on the drive home. He noticed that dizziness was on the list of potential severe allergic reactions. He states he has never had an allergic reaction to any other vaccines. He states that he has only been allergic to one antibiotic in the past (he did not name the medication) and he checked the list of ingredients prior to receiving the Pfizer COVID-19 vaccine and it was not a listed ingredient. The patient was concerned about the potential for a more severe reaction after receiving the second dose of the Pfizer COVID-19 vaccine because he has heard that the second dose is "more potent" than the first dose and if he should receive the second dose of the vaccine considering the side effects he experienced immediately after receiving the first dose. The nurse walked by his vehicle to check to see how he was feeling and he was fine and didn't feel anything. After she walked away, he felt as though the whole car was spinning and he had hot flashes. He called the nurse back over and told her what was going on and that he felt dizzy and a little weak, really hot and he broke out in a sweat. He rolled down window, turned on AC and he was given water. Was monitored for some time at least 5-10 minutes before he felt a little better. Still had a little dizziness up until the end, but they continued to monitor him. He was felt better after that and was able to drive home. Because dizziness and weakness is listed as severe side effects, does this mean that they will last more than 10-15 minutes because he is concerned about getting the second dose. Knows and heard the second dose is a little more potent and if he had these reactions 2 minutes post injection should he be concerned about getting the second dose. No other vaccines given the same day or 4 weeks prior. Had a flu shot 2 months prior, but unable to provide NDC, Lot, or expiry for flu shot. No problems with vaccines in past. Again, mentions the only thing that concerned him was the dizziness and hot flashes he had 2 minutes post injection. No further details provided. The events has not resulted in emergency room or physician visit. The relevant lab test was reported as none. Therapeutic measures were taken as a result of fever and treatment included over the counter Ibuprofen to help him feel better. Outcome of the event feverish was recovered and while all other events was recovering.  Follow-up attempts are completed. No further information is expected.