I was not feeling good after night my body was just burning and everything; hit me pretty hard; I was not feeling good after night my body was just burning and everything; hit me pretty hard; Headache; I am on some kind of pills (unspecified medication) that interfere, that puts my immune system down a little bit and I think that is what was causing some of this issue; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 62-year-old male patient received BNT162b2 (BNT162B2), on 09Apr2022 as dose 4 (booster), single (Lot number: FK9894) at the age of 62 years for covid-19 immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose 1, single, Manufacturer: Pfizer), for Covid-19 immunization, reaction(s): "I got minor tired"; Bnt162b2 (Dose 2, single, Manufacturer: Pfizer), for COVID-19 immunization, reaction(s): "I got minor tired"; Bnt162b2 (Dose 03 (Booster), single, Manufacturer: Pfizer), for Covid-19 immunization, reaction(s): "I got minor tired". The following information was reported: HEADACHE (non-serious) with onset 10Apr2022, outcome "unknown"; IMMUNE SYSTEM DISORDER (non-serious) with onset 10Apr2022, outcome "unknown", described as "I am on some kind of pills (unspecified medication) that interfere, that puts my immune system down a little bit and I think that is what was causing some of this issue"; MALAISE (non-serious), BURNING SENSATION (non-serious) all with onset 10Apr2022, outcome "unknown" and all described as "I was not feeling good after night my body was just burning and everything; hit me pretty hard". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information:  Consumer stated, "he got the Pfizer (COVID-19) Vaccine yesterday (09Apr2022), he saw, they got the vaccine yesterday and his wife feels good but he was not after night and stuff his body was just burning and everything. How long does it take that stuff to go away because he got headache. When probed to confirm if got Pfizer COVID-19 Vaccine, consumer stated, "Yes", they got the 4th shot yesterday. When paraphrased the concern, consumer stated, "Yes". Consumer was informed about the Role of Pfizer Drug Safety. Consumer stated, he has it all right here. He will take care of it tomorrow and he was going to laydown kind of keep his head from "crap" (further word not clarified). He had the other shots (Pfizer COVID-19 first dose, second dose and Booster dose) and he did get no side effects whatsoever. He got tired but that was minor. But this one (4th dose COVID-19 Vaccine) hit him pretty hard. He got all 4 shots and he got it (4th dose) yesterday. When probed for vaccine Expiration date, consumer stated, "he doesn't see the Expiration Date. He saw the date when he got the shot (4th dose), He got it yesterday." Consumer's age "62" (Further not clarified hence not captured in the tab). When probed for consumer's weight, consumer stated, "His weight was about 210 or 212 (pounds) somewhere around there." (Further not clarified hence not captured in the tab). Consumer further stated, "his wife feels good and always she was the one that got it (further clarification unknown) but he was on some kind of pills (unspecified medication, Expiry Date of Unspecified medication: Unknown) that interfere, He was on medication that puts his immune system down a little bit and he think that was what was causing some of this issue." As call abruptly hung up. Hence further probing could not be done. Limited information available over the call. Reason for no lot number: of Unspecified medication: Complainant hung up abruptly/transfer incomplete.  No follow-up attempts are possible. No further information is expected.