Knocked him out; when someone was talking to him about something he could not remember what they were talking about; wiped him out mentally/messing with his head so bad; takes away his ability to concentrate; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A male patient received bnt162b2 omi xbb.1.5 (COMIRNATY (2023-2024 FORMULA)), on 02Nov2023 as dose 1, single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2, bnt162b2 omi ba.4-5 (DOSE 3 (BOOSTER), SINGLE, Batch/ Lot number not reported), for Covid-19 immunization; Bnt162b2 (DOSE 2, SINGLE, Batch/ Lot number not reported), for Covid-19 immunization; Bnt162b2 (DOSE 1, SINGLE, Batch/ Lot number not reported), for Covid-19 immunization. The following information was reported: FATIGUE (non-serious), outcome "unknown", described as "Knocked him out"; MEMORY IMPAIRMENT (non-serious), outcome "unknown", described as "when someone was talking to him about something he could not remember what they were talking about"; MENTAL DISORDER (non-serious), outcome "unknown", described as "wiped him out mentally/messing with his head so bad"; DISTURBANCE IN ATTENTION (non-serious), outcome "unknown", described as "takes away his ability to concentrate".  Additional Information: Patient said that he was calling about the Pfizer BioNTech Covid-19 Vaccine. He got a covid booster shot this morning. On the bottom of the vaccine it only said BioNTech and did not have Pfizer on the Lot number or anything. Asked if Pfizer BioNTech one and the same for the booster shot. When everything came out everything said Pfizer BioNTech and were like they were one and the same. Asked if it was the Pfizer BioNTech 2023 the same as it was previously.The First year the vaccines came out, he works at a level 1 trauma center. The first dose knocked him out and stated that he had to go home from work. When he got the first shot, a hour afterward he said that when someone was talking to him about something he could not remember what they were talking about. He had the same problem with the second dose. Last years booster wiped him out mentally. He would never take another one. It takes away his ability to concentrate. He would rather quit his job. He is ready to say no to another vaccine if it is mandated and leave his job. Even if it comes to the flu vaccine. These vaccines are messing with his head so bad. If they mandate it he will just tell them no and leave his job. It wipes out his ability to concentrate. It seems to only be happening to him. He said that 4 for 4  of his doses have had exact same thing. He will need to sleep it off over the weekend. He said that it could be dangerous if something like this happened to his mom or someone else and they decided to get on the highway after getting a dose.  The information on the batch/lot number for bnt162b2 omi xbb.1.5 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202300355725 Same patient/reporter,vaccine,events/ Different dose;US-PFIZER INC-202300355726 Same patient/reporter,vaccine,events/ Different dose;US-PFIZER INC-202300355727 Same patient/reporter,vaccine,events/ Different dose;