no strength at all in her legs and her arms, muscles didn't work at all; Nauseas; Temperature of 100.6 degrees; Headache; her joints swelled; her hands were swollen and tight; This is a spontaneous report from a contactable consumer (Patient). A 79-years-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, Solution for injection), an unspecified route of administration, administered in Arm Right on 25Feb2021 at 10:30 (Batch/Lot Number: EL9267) as 1st dose, single for covid-19 immunization.Concomitant medication(s) included warfarin sodium (COUMADIN), she takes a 5mg tablet, by mouth, once daily on tuesday, thursday and saturday's. The rest of the days she takes a half of a 5mg tablet confirmed as a 2.5mg dose, by mouth once daily. Indication: She had 2 strokes about 12 years ago, so it keeps her blood regulated, not too thick or too thin, usually it's right on. When probed for any product information, the caller made the comment let her get in some light so she can see better. She confirms the bottle is dispensed in a pinky peach pharmacy vial. She sees an Rx number, Use by date: 26Jan2022 and losartan potassium (COZAAR) taken for blood pressure measurement was the generic for Cozaar, Losartan potassium. She takes a 25mg, tablet, by mouth, once daily for her blood pressure. She verifies this medication is also dispensed in a pharmacy bottle. She mentioned she takes both medications, Coumadin and the Losartan potassium, at night time because it's easier for her to remember. The patient stated she takes a blood pressure medication and a coumadin tablet, She clarifies she has been on these medications for a long time, more than the 2 week time period leading up to receiving the COVID-19 vaccine.  She went to bed early on Friday night, 26Feb2021, because she had issues all day long and she forgot to take these medications. She only takes 2 pills at night but she forgot all about them because she had all that stuff going on during the day.  o prior vaccinations within 4 weeks. Medical history included cerebrovascular accident (She had 2 strokes about 12 years ago).  O 25Feb2021, the patient experienced headache and on 26Feb2021, the patient had asthenia, nausea , pyrexia (temperature was 100.6 degrees), joint swelling and peripheral swelling. It was reported that patient had a really crazy experience, She received her first dose on 25Feb2021 at around 10:30 am afterwards, she had just a regular headache and then the next morning, she tried to get out of bed and had no strength at all in her legs and her arms. She got up out of bed, and her legs would not hold her up so she collapsed on the floor. She mentions her husband is hard of hearing and she was calling for his name to help her. She could not even scoot on the floor, her muscles just did not work at all. The caller states her husband came in and got her up. She went to the bathroom and then for the rest of the day, she stayed in the recliner. Really, the next day, she got back her strength in her shoulders. She clarifies on Saturday, 27Feb2021, she started to get back her strength. She also read in the newspaper to not get a mammogram and a COVID-19 vaccine on the day and she did because they didn't know. She confirms her mammogram was scheduled on 25Feb2021 at 2pm, which was after when she received the COVID-19 vaccine, so her mammogram might not be right. The outcome of events recovered on 27Feb2021. No follow-up attempts are needed; information about lot/batch number cannot be obtained.