Foggy brain and having a hard time thinking; Foggy brain and having a hard time thinking; Tiredness; Feeling unwell; He feels wobbly and is still feeling it when he goes downstairs he holds on to railing/Feel wobbly and has to hold onto railing when using stairs; Dizziness/He was sleeping a lot; Regarding lack of balance and wobbliness; had no energy; memory is not as good; His legs feel weaker and he has to hold on when going down stairs; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 78 year-old male patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 19Feb2021 11:00 (Lot number: EN5318) at the age of 78 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "high blood pressure" (unspecified if ongoing). Concomitant medication(s) included: TOPROL XL taken for hypertension, start date: 01Jan2021. Vaccination history included: Bnt162b2 (He got the first Pfizer COVID vaccine on 29Jan2021.), administration date: 29Jan2021, when the patient was 78 years old, for Covid-19 immunization. The following information was reported: THINKING ABNORMAL (non-serious), FEELING ABNORMAL (non-serious) all with onset 01Mar2021 08:30, outcome "recovering" and all described as "Foggy brain and having a hard time thinking"; FATIGUE (non-serious) with onset 01Mar2021 08:30, outcome "recovering", described as "Tiredness"; MALAISE (non-serious) with onset 01Mar2021 08:30, outcome "not recovered", described as "Feeling unwell"; NERVOUSNESS (non-serious) with onset 01Mar2021 08:30, outcome "recovering", described as "He feels wobbly and is still feeling it when he goes downstairs he holds on to railing/Feel wobbly and has to hold onto railing when using stairs"; DIZZINESS (non-serious) with onset 01Mar2021 08:30, outcome "recovering", described as "Dizziness/He was sleeping a lot"; ASTHENIA (non-serious) with onset Feb2021, outcome "unknown", described as "had no energy"; MEMORY IMPAIRMENT (non-serious) with onset Feb2021, outcome "unknown", described as "memory is not as good"; MUSCULAR WEAKNESS (non-serious) with onset Feb2021, outcome "unknown", described as "His legs feel weaker and he has to hold on when going down stairs"; BALANCE DISORDER (non-serious) with onset 01Mar2021 08:30, outcome "recovering", described as "Regarding lack of balance and wobbliness".  Additional information: It was reported that, Received call from consumer regarding the Pfizer COVID vaccine.  He got the first Pfizer COVID vaccine on 29Jan2021 and did not have any side effects whatsoever.  He had the second one 19Feb2021 and did not have any side effects and then about a week and a half later, he started to have a foggy brain.  He has a hard time thinking and has a few other things.  He had having tiredness and never got a fever.  He also had the feeling of being unwell and did not feel right.  That started a week and a half to 2 weeks and is waiting for it to go away.  He doesn't know if it was because of the second shot or does he have something else. There was no prescriber. It all started on the same day.  He woke up and felt weird.  He was sleeping a lot and had no energy, stayed home and sat on couch, watched tv and would fall asleep.  The last couple of days, he still feels weird.  He feels foggy going through bank account and would need to recheck things.  His memory is not as good and he would have to go to write things down, which was not like before. He felt wobbly and was still feeling it when he went downstairs he holds on to railing.  His legs feel weaker and he has to hold on when going down stairs, which he never had to do before. The brain fogginess was different from daily brain fade. This is just normal.  This all started on 01Mar2021.  He did not have any of this before.  His daily brain function would normally not be dizzy, wobbly or tired.  He said tiredness would normally not be until end of day.  Regarding lack of balance and wobbliness, normally he has none of that.  He was fine until it hit him.  Since it was so long after it hit him, he made a doctor's appointment and he realizes it could be something else. The tiredness is still there but is getting better. He has no energy.   No follow-up attempts are possible. No further information is expected.