fever; weakness in her head; blood pressure was down/blood pressure went down to 80; every time she got down, she was definitely ill; her heart rate went down; she couldn't even lift her head or lift her arms; she couldn't even lift her head or lift her arms; she couldn't even lift her head or lift her arms; This is a spontaneous report received from a contactable reporter(s) (Nurse) from medical information team.  An 83-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), as dose 4 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose 1, Single), for COVID-19 immunization, reaction(s): "weakness in her head", "blood pressure was down/blood pressure went down to 80", "she couldn't even lift her head or lift her arms", "her heart rate went down", "she couldn't even lift her head or lift her arms", "every time she got down, she was definitely ill", "she couldn't even lift her head or lift her arms", "Fever"; Bnt162b2 (Dose 2, single), for COVID-19 immunization, reaction(s): "weakness in her head", "blood pressure was down/blood pressure went down to 80", "she couldn't even lift her head or lift her arms", "her heart rate went down", "she couldn't even lift her head or lift her arms", "she couldn't even lift her head or lift her arms", "Fever"; Bnt162b2 (Dose 2, Single), for COVID-19 immunization, reaction(s): "every time she got down, she was definitely ill"; Bnt162b2 (Dose 3, single), for COVID-19 immunization, reaction(s): "weakness in her head", "blood pressure was down/blood pressure went down to 80", "she couldn't even lift her head or lift her arms", "her heart rate went down", "she couldn't even lift her head or lift her arms", "every time she got down, she was definitely ill", "she couldn't even lift her head or lift her arms", "Fever". The following information was reported: PYREXIA (non-serious), outcome "unknown", described as "fever"; ASTHENIA (non-serious), outcome "unknown", described as "weakness in her head"; BLOOD PRESSURE DECREASED (non-serious), outcome "recovered", described as "blood pressure was down/blood pressure went down to 80"; ILLNESS (non-serious), outcome "recovered", described as "every time she got down, she was definitely ill"; HEART RATE DECREASED (non-serious), outcome "recovered", described as "her heart rate went down"; HYPOKINESIA (non-serious), HEAD DISCOMFORT (non-serious), LIMB DISCOMFORT (non-serious), outcome "recovered" and all described as "she couldn't even lift her head or lift her arms". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Patient had received 4 doses of the Pfizer-BioNTech COVID 19 Vaccine. However, in these previous shots, she has had fever, weakness in her head and also her blood pressure was down. She has 4 COVID Vaccine and every time she got down, she was definitely ill; it wasn't like it was a single incident, it was every time she got the Pfizer Vaccine. Her blood pressure went down to 80 and her heart rate went down and then it was like, she couldn't even lift her head or lift her arms or anything like that and it lasted like a 24 hour period. Caller wanted to even get her the booster (Unspecified Booster Shot) but too scared of it.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201293068 same patient/drug/event, different dose;US-PFIZER INC-202201293433 same patient/drug/event; different dose;