experienced a fever that subsided; chills; dizziness; headache; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 36 year-old male patient received bnt162b2 (BNT162B2), administered in arm, administration date 2021 (Batch/Lot number: unknown) as dose 2, single for covid-19 immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose 1), for COVID-19 immunization.  The following information was reported: PYREXIA (non-serious) with onset 2021, outcome "recovered" (2021), described as "experienced a fever that subsided"; CHILLS (non-serious) with onset 2021, outcome "unknown", described as "chills"; DIZZINESS (non-serious) with onset 2021, outcome "recovered" (2021), described as "dizziness"; HEADACHE (non-serious) with onset 2021, outcome "recovered" (2021), described as "headache". Therapeutic measures were taken as a result of pyrexia, headache.  Narrative case summary and further information:   Additional Context: Warm transfer from Name (Withheld) with Pfizer Medical Information: INT-# Consumer on the line that wanted to report an adverse event with Pfizer COVID-19 Vaccine  Declines his first and last name, stating it's confidential. The caller confirmed the details provided by the transfer agent.   Clarified AE as:  He took the COVID-19 Vaccine booster shot in the morning at 10:00AM on 02Nov2021. That evening, had chills and fever. Took Tylenol and it subsided. Fever again in the morning. Took one more Tylenol and it subsided. In the afternoon, fever came up again. Took one more Tylenol and it subsided. Temperature was 101.  States he experienced: chills, fever, dizziness, and headache. Initially caller stated he knows this is related to COVID. Clarified, that caller knows it's related to the COVID-19 Vaccine because he did not take anything else. Confirmed caller did not test positive for COVID-19. At 20:30 on 02Nov2021, experienced the chills and fever. States now he only has the fever.   Fever:  Outcome: Think for the moment, it's subsided because of the Tylenol. After a certain time, the fever comes back.   Dizziness: Outcome: States it's subsided, but he still has some lightheadedness in his head because of all of the symptoms.   Headache:  Outcome: Has subsided today, but kind of has a headache feeling. Doesn't know if it will come back again because he is on medication. The Tylenol only has a half-life of 6-8 hours. Not sure if it's going to come back.   After the second dose of the COVID-19 Vaccine: experienced a fever that subsided. This was 6-8 months ago. He recovered completely. History and Investigations: None, is perfectly healthy.   VACCINE SUPPLEMENTAL FORM There is a Product Complaint. Description of complaint:  Product: Tylenol, That evening, had chills and fever. Took Tylenol and it subsided. Fever again in the morning. Took one more Tylenol and it subsided. In the afternoon, fever came up again. Took one more Tylenol and it subsided. Headache subsided, but he doesn't know if it will come back again. States the Tylenol only has a half-life of 6-8 hours.  NDC/LOT/EXP not probed over call.  Follow-up (10Nov2021): This follow-up is being submitted to notify that the lot/batch number is not available despite the follow-up attempts made. Follow-up attempts completed. No further information is expected. No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.