feeling very confused; received dose 1 on 01Jan2021 and dose 2 on 14Feb2021; brain fog; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 80 year-old female patient received bnt162b2 (BNT162B2), administered in arm right, administration date 14Feb2021 13:00 (Lot number: EN5318) at the age of 80 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Blood pressure" (unspecified if ongoing); "shrunk a little from natural aging, she used to be 5 foot 2 inches tall" (unspecified if ongoing); "keeps her happy" (unspecified if ongoing), notes: Medroxyprogesterone and buspirone indication; "blood thinner" (unspecified if ongoing), notes: indication for taking clopidogrel; "for hair and nails" (unspecified if ongoing), notes: indication of biotin; "for hair and nails" (unspecified if ongoing), notes: indication of biotin; "for heart" (unspecified if ongoing), notes: indication of carvedilol; "stomach heart burn" (unspecified if ongoing). Concomitant medication(s) included: MEDROXYPROGESTERONE taken for affective disorder, start date: 1989; CLOPIDOGREL taken for blood disorder; ESTRADIOL, start date: 1989; BIOTIN taken for hair disorder, nail disorder; PANTOPRAZOLE taken for dyspepsia; IRBESARTAN taken for blood pressure abnormal; BUSPIRONE taken for affective disorder, start date: 1989; CARVEDILOL taken for cardiac disorder, start date: 2012. Past drug history included: Aspirin for blood thinner, notes: was previously taken before Clopidogrel. Vaccination history included: Bnt162b2 (Dose 1, Administration time: 13:00, Administration location: Right arm, Lot number: EL9262), administration date: 01Jan2021, when the patient was 80 years old, for COVID-19 immunisation, reaction(s): "back was bothering", "brain fog". The following information was reported: FEELING ABNORMAL (non-serious) with onset Feb2021, outcome "not recovered", described as "brain fog"; CONFUSIONAL STATE (non-serious), outcome "unknown", described as "feeling very confused"; INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (non-serious), outcome "unknown", described as "received dose 1 on 01Jan2021 and dose 2 on 14Feb2021". Additional information: It was reported that after the second shot, the patient went to the acupuncturist again and mentioned that she was having brain fog and feeling very confused when she was driving; and she couldn't get the microwave to work; or do other ordinary tasks. The patient was unsure when these started and seems to be still happening. It was reported that the everyday things that you do that she was unable to do. It was also reported the acupuncturist prescribed something to clear the virus out of her brain. The patient was querying if other people reported brain fog. Brain fog was the thing she was most concerned about. It was reported that the patient was trying to see about getting a new doctor because of the events. The patient had no history of all previous immunization with the Pfizer vaccine considered as suspect and patient had no additional vaccines administered on same date of the Pfizer suspect. The patient had no prior vaccinations within 4 weeks. The patient had no family medical history and relevant test.  No follow-up attempts are possible. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-2021273962 Same reporter, patient and product; similar events; different dose.