she started aching in her joints / caller states her thighs are hurting so bad and her legs and ankles; she started aching in her joints and saw that one listed but has throbbing muscle cramps; Caller states her thighs are hurting so bad and her legs and ankles and she can barely walk; Caller states her thighs are hurting so bad and her legs and ankles and she can barely walk; Caller experienced muscle cramps on her legs, feet, and thighs every hour or every other hour.; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 64 year-old female patient received bnt162b2 (COMIRNATY), administered in arm right, administration date 21Mar2022 09:00 (Lot number: FJ6369) at the age of 64 years as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medication(s) included: POTASSIUM (ongoing); POTASSIUM (ongoing); MAGNESIUM OXIDE (ongoing). Vaccination history included: Bnt162b2 (Dose: 1, Lot: EW0172 , Expiry date: Aug2021), administration date: 02Aug2021, when the patient was 63 years old, for Covid-19 immunization; Bnt162b2 (Dose: 2, Lot: EW0172 , Expiry date: Aug2021), administration date: 23Aug2021, when the patient was 63 years old, for Covid-19 Immunization; Dupixent (Dupixent 300mg administered to her thigh), administration date: 14Mar2022, when the patient was 64 years old.  The following information was reported: MUSCLE SPASMS (non-serious) with onset 21Mar2022, outcome "recovering", described as "Caller experienced muscle cramps on her legs, feet, and thighs every hour or every other hour."; ARTHRALGIA (non-serious), outcome "unknown", described as "she started aching in her joints / caller states her thighs are hurting so bad and her legs and ankles"; PAIN (non-serious), outcome "unknown", described as "she started aching in her joints and saw that one listed but has throbbing muscle cramps"; PAIN IN EXTREMITY (non-serious), GAIT DISTURBANCE (non-serious), outcome "unknown" and all described as "Caller states her thighs are hurting so bad and her legs and ankles and she can barely walk". Therapeutic measures were taken as a result of muscle spasms, arthralgia, pain, pain in extremity.   Additional information: Female patient called in about receiving the Pfizer COVID-19 Vaccine booster dose yesterday, 21Mar2022. Caller experienced muscle cramps on her legs, feet, and thighs every hour or every other hour. Caller has already been better. Caller wants to know if there is information on cramping after getting the booster dose. Unable to obtain caller's age. Caller states her 1st dose of the Pfizer Covid vaccine was on 02Aug2021 with lot EW0172 and expiry date Aug2021, the 2nd dose was on 23Aug2021 with lot EW0172 and expiry date on Aug2021 and the booster dose was yesterday 21Mar2022 with lot FJ6369 and states her patient card has no NDC numbers or expiry date for her booster dose written on the card. Prior Vaccinations (within 4 weeks): Yes, states she was administered Dupixent 300mg administered to her thigh and is not sure which thigh as she rotates thighs every month to rotate the site; states she has no lot, expiry date or manufacturer to provide and her last Dupixent was administered on 14Mar2022. Caller states she takes her normal medications and does those every day. States she has the Potassium bottle and it is an orange pharmacy bottle with lot 3127179 and has no manufacturer on the bottle or expiry date and NDC 00378456177 and the dose is she takes 10meq ER and now sees it is manufactured by Mylan; states she takes the Potassium two of the tablets once a day with food and began taking it 15-20 years ago. Caller states for the magnesium it has lot 21D001, expiry date Mar2024, NDC 5793 and then states that is not it but the NDC is 5796310212 and it is a white manufacturer bottle of Mag Oxide 400mg and she began taking it 15-20 years ago and it is a generic pharmaceutical company. Caller states she has to take another Ibuprofen and they are tablets that are 200mg coated tablets and it is the Equate brand of Ibuprofen with lot P126071, expiry date Jul2024, and for the UPC has to get closer to the light to see it and it is #. Caller states she takes blood pressure medicine and stuff during the day but did not start any of her other medications within 2 weeks prior to the reported event.  No follow-up attempts are possible. No further information is expected.