muscle aches; had a high fever that was 103 and then went away; she had what felt like dizziness; felt like she took a sedative after first vaccine; brain fog, did not feel sharp, felt mellow, staring into space, lack of clarity; This is a spontaneous report from a contactable consumer (patient).  A 50-years-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot Number: EW0179, Expiration date: Aug2021), via an unspecified route of administration, in left arm on 17Jun2021 14:00 (at the age of 50-years-old) as dose 1, single for covid-19 immunization in hospital. No previous immunization with the Pfizer vaccine was considered as suspect. No additional vaccines administered on same date of the Pfizer suspect. No prior vaccinations were given within 4 weeks. Family medical history was none. The patient's medical history and concomitant medications were none. On 17Jun2021, the patient felt like she took a sedative after first vaccine, brain fog, did not feel sharp, felt mellow, staring into space, lack of clarity, she had what felt like dizziness. On 21Jun2021, the patient had a high fever that was 103 and then went away, muscle aches. Patient stated she was concerned because she had her first dose of the Pfizer Covid-19 Vaccine on last 17Jun2021, and she was wondering if this was normal because it scared her. Ten minutes after the vaccine, she had what felt like dizziness, but she does not want to call dizziness, she could still walk, it just felt like she took a sedative. She had brain fog and was just kind of driving home and did not feel sharp, she felt mellow. She kind of thought it would go away. She felt herself staring into space and did not feel sharp. It scared her a little bit. That was on 17Jun2021. On 21Jun2021, she had a high fever that was 103 and then went away. Patient stated she still has brain fog and lack of clarity. Patient confirmed that the brain fog feeling encompassed everything else that she mentioned regarding feeling not sharp, mellow, staring into space, and lack of clarity. She had what felt like dizziness, brain fog, did not feel sharp, felt mellow, staring into space, lack of clarity, felt like she took a sedative after first vaccine: this started 10 minutes after the vaccine. It was kind of still going on and she was kind of scared. She would say it was about the same. She does not usually get like that; she has taken a flu vaccine and other things and she just has not gotten it. Patient clarified she means she has not gotten that feeling before, she was usually never allergic to anything. Patient added that all of these things are the same feeling and that she feels about the same now, like not sharp. Regarding muscle aches: this occurred when she had the fever, it is a teeny bit, little bit better. Patient stated no, she is really healthy and does not take any medicine. Patient received the first dose of the Pfizer COVID-19 vaccine on 17Jun2021. She experienced a brain fog 10 minutes post vaccination. She was not feeling sharp. It felt like she took sedatives. It still going on. She had 103 fever which went away Tuesday. The brain fog was still persistent. Patient wanted to know if this side effect has been reported with the vaccine. Response received as There were no other notable patterns or numerical imbalances between treatment groups for specific categories of serious adverse events (including neurologic events) that would suggest a causal relationship to Pfizer-BioNTech COVID-19 Vaccine. The patient underwent lab tests and procedures which included body temperature was 103 Fahrenheit on 21Jun2021. No treatment was received for the events. The outcome of the event had a high fever that was 103 and then went away was recovered on 22Jun2021. The outcome of the event muscle aches was recovering and not recovered for other events.  Information on the lot/batch number has been requested.