dizziness; vertigo; cognitive decline; confusion; an inability to focus/ with concentration 75% of normal, and having to think harder about basic things like folding laundry, which is easy to lose concentration; Booster; Felt a little funny in their head/head still feels wonky/ he didn't feel right in his head/ his brain didn't feel fine; can't lay down and use the bench press, can't lay down in the bed unless it's super slow; felt like after a little bit of exertion I could feel it in my head; This is a spontaneous report received from contactable reporter(s) (Consumer or other non-healthcare professional) from medical information team for a Pfizer sponsored program. The reporter is the patient. A 61-year-old male patient received bnt162b2 (BNT162B2), administration date 02Dec2021 (Lot number: FO0809) at the age of 61 years as dose 3 (booster), single for covid-19 immunisation. The patient relevant medical history was not reported. There were no concomitant medications. Past drug history included: Advair, reaction(s): "leg pains", notes: Advair samples, since one was a bump up in the dose to 500, and he experienced leg pains. He says he got pains in his legs walking, and when he talked to the pharmacists with Pfizer they said yeah some people get that, and he didn't leg pains on the lower dose. He says he had a few days of leg pains. Advair NDC/LOT/EXP: Unknown. Caller says that this was several years ago, Miralax. Vaccination history included: Bnt162b2 (Dose 1, LOT:EN6200), administration date: 11Mar2021, when the patient was 60 years old, for Covid-19 immunisation, reaction(s): "dizziness", Bnt162b2 (Dose 2, LOT: EN6206, had some cognitive dysfunction with the second dose but not as much), administration date: 05Apr2021, when the patient was 60 years old, for Covid-19 immunisation, reaction(s): "cognitive dysfunction", "diminished strength for 10-12 days", "felt a little funny in the head for a short period of time", "sore arms". The following information was reported: IMMUNISATION (non-serious) with onset 02Dec2021, outcome "unknown", described as "booster", FEELING ABNORMAL (non-serious) with onset 02Dec2021, outcome "not recovered", described as "felt a little funny in their head/head still feels wonky/ he didn't feel right in his head/ his brain didn't feel fine", DIZZINESS (non-serious) with onset 03Dec2021, outcome "unknown", described as "dizziness", MUSCULOSKELETAL DISCOMFORT (non-serious) with onset Dec2021, outcome "unknown", described as "can't lay down and use the bench press, can't lay down in the bed unless it's super slow", COGNITIVE DISORDER (non-serious) with onset 02Dec2021, outcome "unknown", described as "cognitive decline", CONFUSIONAL STATE (non-serious) with onset 02Dec2021, outcome "unknown", described as "confusion", DISTURBANCE IN ATTENTION (non-serious) with onset 02Dec2021, outcome "not recovered", described as "an inability to focus/ with concentration 75% of normal, and having to think harder about basic things like folding laundry, which is easy to lose concentration", VERTIGO (non-serious) with onset 03Dec2021, outcome "recovered" (03Dec2021), described as "vertigo"; DIZZINESS EXERTIONAL (non-serious) with onset Dec2021, outcome "unknown", described as "felt like after a little bit of exertion I could feel it in my head". Therapeutic measures were not taken as a result of feeling abnormal, dizziness, musculoskeletal discomfort, cognitive disorder, confusional state, disturbance in attention, vertigo, dizziness exertional.  Additional information: Caller said they are still dealing with it a little, and they are a bit concerned about future boosters if they have to take those, and it was the same with his wife. He said after their first vaccine dose they both had a little dizziness that was not bad, they were fine. He said after their second vaccine dose they both felt a little funny in the head for a short period of time, and random stuff they don't care about like sore arms which does not concern him, and diminished strength for 10-12 days which did not concern him. He said he was concerned after the third dose for which they stayed at the store 15 minutes afterwards and felt roughly ok, then went to their vehicle to leave and felt for some reason like he was not able to drive, he did not feel right in his head. He said his body felt fine, but his brain did not feel fine. He said his wife experienced this only a bit, and thankfully they were only a mile away at the withheld where they got the vaccine. He said when they got home he felt strange in his head and started noticing, which the only way to describe it was cognitive decline and confusion, an inability to focus. He said they had to think on simple remedial tasks like making toast and really concentrate. He said they both decided to chill out and lay down and relax and sleep. He said what happened was they took the rest of Thursday off. He said on Friday they were presenting with dizziness and when he laid down in bed he had vertigo for 20 secs or so, his wife had a headache, but he did not have a headache. He said at ten o clock on day two, which was Friday, his wife was cooking potatoes and the subject came up and she asked if she should cut a couple more potatoes, then she said it was weird because she does not remember cutting the potatoes, and she asked what day is it, and then she goes am I supposed to be at work. He said he told her no, that they called out for the day from getting the vaccine, and asked if she remembered but his wife did not remember getting the booster. He said this went on for 15-20 minutes and then he contacted withheld but he could not get thru, so he tried to get a hold of Pfizer because he spoke to their pharmacists in the past a couple of times, but he could not get thru, then he tried withheld and it was the same deal. He says they have a medical facility there but he could not get thru, so he called his son who is a paramedic who said if they go into the ER, there is a 4-6 hour triage period to sit in the ER and you cannot get in to see anybody unless it was severe. He said he tried their general practitioner who is off on Fridays and they were able to get a hold of them for a minute and he advised to take her to the ER if she did not improve. Caller said he felt like he should not be driving, and then in 30-45 minutes she started to remember things, they gradually came back to her over the next 1-2 hours. He said for 35-40 minutes she was in la-la-land. He said at this point they were still dealing with head feeling strange, with concentration 75% of normal, and having to think harder about basic things like folding laundry, which is easy to lose concentration. He says they were both dealing with this kind of stuff. He said the near as he can tell when he delved into research on this, was buried in there were truck drivers and airplane pilots, though the studies were not broad, who had gotten encephalopathy post vaccine. He said after vaccine dose two they both had a mild case maybe and were a little dizzy, and then the booster with three vaccines in less than a year, he felt like that might be it though he does not know all the earmarks. He said there was amnesia, confusion, cognitive dysfunction of swelling in brains, and that is why he called because he wanted to find out if it was ok and does that mean they should not get a booster down the road if they are necessary. He said he was pro-vaccine and is still pro-vaccine, but he is a little concerned, he thinks with good reason. He says he does not know how many others experienced this, he is sure it would be a small majority, but it was strange since both his wife and he got the vaccines at the same locations at the same times. Caller said he spoke to Pfizer previously about Advair samples, since one was a bump up in the dose to 500, and he experienced leg pains. He said he got pains in his legs walking thru withheld, and when he talked to the pharmacists with Pfizer they said yeah some people get that, and he did not leg pains on the lower dose. He said he had a few days of leg pains. Caller said that this was several years ago after he got some samples from his general practitioner. He says he does not have a reference number to provide for a previous report. Caller says they did no treatment.  Follow-Up (13Dec2021): Follow-up attempts are completed. No further information is expected.