I have been taking the Pfizer Covid Shot (Pfizer Covid-19 Vaccine) and the Booster shot for this pandemic; Having problems with iron deficiency anemia; D3 has gone down; my red blood cells are dropping; B12 is dropping; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 65 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 15Oct2021 (Batch/Lot number: unknown) at the age of 65 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Diabetes mellitus" (unspecified if ongoing), notes: Verbatim: Diabetes; "Hypertension" (unspecified if ongoing), notes: Verbatim: Hypertension. Concomitant medication(s) included: OZEMPIC taken for diabetes mellitus; ZESTRIL taken for hypertension; DIURIL [CHLOROTHIAZIDE] taken for hypertension; CLONIDINE taken for hypertension. Vaccination history included: Bnt162b2 (1st dose of covid vaccine, Anatomical site of vaccination: Consumer stated, "Left arm, all of them were left arm."), administration date: 20Feb2021, when the patient was 65 years old, for COVID-19 Immunization, reaction(s): "Started having problems with my red blood cells dropping", "I haven't had any energy to do anything", "was being tired", "I can barely move", "B12 have dropped again", "D3 have dropped again", "I have developed iron deficiency anemia"; Bnt162b2 (2nd dose of covid vaccine, Anatomical site of vaccination: Consumer stated, "Left arm, all of them were left arm."), administration date: 13Mar2021, when the patient was 65 years old, for COVID-19 Immunization, reaction(s): "Started having problems with my red blood cells dropping", "I haven't had any energy to do anything", "was being tired", "I can barely move", "B12 have dropped again", "D3 have dropped again", "I have developed iron deficiency anemia". The following information was reported: IMMUNISATION (non-serious) with onset 15Oct2021, outcome "unknown", described as "I have been taking the Pfizer Covid Shot (Pfizer Covid-19 Vaccine) and the Booster shot for this pandemic"; IRON DEFICIENCY ANAEMIA (non-serious) with onset 2021, outcome "unknown", described as "Having problems with iron deficiency anemia"; VITAMIN D DEFICIENCY (non-serious) with onset 2021, outcome "unknown", described as "D3 has gone down"; RED BLOOD CELL COUNT DECREASED (non-serious) with onset 2021, outcome "unknown", described as "my red blood cells are dropping"; VITAMIN B12 DECREASED (non-serious) with onset 2021, outcome "unknown", described as "B12 is dropping". The events "having problems with iron deficiency anemia", "d3 has gone down", "my red blood cells are dropping" and "b12 is dropping" were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of iron deficiency anaemia, vitamin d deficiency, red blood cell count decreased, vitamin b12 decreased.  Additional information: Consumer stated, "The patient had been taking the Pfizer Covid Shot (Pfizer Covid-19 Vaccine) and the Booster shot for this pandemic and all of a sudden she had been having problems with iron deficiency anemia and the B12 had gone down and the D3 had gone down, and she was wondering if some of the side effects of the shot, does it cause anemia. Because the doctors have done tests and everything and they cannot figure out why her red blood cells are dropping or the B12 was dropping and D3 was dropping." Treatment: Consumer stated, "Yes, she had iron infusion and she had been on strong Iron pill and 50000mg of the D3 and a 1000 of the B12." Laboratory work: Consumer stated, "she does not had that with her." Prior vaccinations (within 4 weeks): Consumer stated 'No'. Consumer also stated, "she thought since she had Pfizer shot (Unspecified vaccine) she thought she developed iron deficiency anemia and her B12 have dropped again and D3 had dropped again and she had conference with 2 pharmacist and gone over her medicine everything and she had iron infusion because she had no energy to do anything and the only thing she could come up with she had to go back to hematologist on 17th on this month because she called today and asked if she can get another iron infusion shot but they told her she had to do her lab work first to see where she was at before she can get second infusion. But she thought since she had the shot last year her first shot was 20Feb2020 and then March, she had to make a correction, it was 20Feb2021 and then her second short was 13Mar2021 and she just got her booster shot 15Oct2021. And she thought may be the side effect, she thought she was no doctor she just thought in 05Jun she started having problems with her red blood cells dropping and she had no energy to do anything. she thought she was being tired because she just moved in June so she thought she was just being tired from the move, so she moved the first week of Jun and so the second week she can't do anything because she was still tired, but third week she said something was quite not right and then the last week of Jun she can barely move and then she knew something was wrong and then she called to make appointment because she just can hardly do anything, she was just so exhausted all the time even after having her iron infusion (Unspecified infusion) in Oct. So, she was wondering was that one of the side effects of having Pfizer shot." QR Comment: Reporter type could not be probed as the consumer was unwilling to share any further information, hence captured by default as consumer or other non-health professional in tab.  The lot number for bnt162b2 was not provided and will be requested during follow up.