Arm was really red; Had a rash on the arm; Arm was hot to the touch; Swollen arm; fluctuations on her heart rate; a fast heart beating; saw everything blurry; a feeling that she was going to faint; Anxiety; panick attacks; interchange of vaccine products; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient. Other Case identifier(s): MOD22-026839 (Moderna).  A patient (no qualifiers provided) received BNT162b2 (BNT162B2), on 29Mar2021 as dose 2, single (Lot number: GN6204) for covid-19 immunisation; elasomeran (MODERNA COVID-19 VACCINE), on 22Apr2022 as dose 4 (booster), single (Lot number: 002M21A) for covid-19 immunisation. The patient's relevant medical history included: "Skin allergies to tapes" (unspecified if ongoing), notes: Skin allergies to tapes; "Latex" (unspecified if ongoing); "allergies to Soap" (unspecified if ongoing). Concomitant medication(s) included: OMEPRAZOLE; ACICLOVIR; IBUPROFEN; ATORVASTATIN; HYDROCHLOROTHIAZIDE; CALCIUM; VITAMIN D [VITAMIN D NOS]; VITAMIN E [VITAMIN E NOS]; VITAMIN C [ASCORBIC ACID]; PROBIOTICS. Past drug history included: Penicillin, reaction(s): "Drug allergy"; Steroid, reaction(s): "Allergies to Steroid", notes: Steroid injections; Gabapentin, reaction(s): "Allergies to Gabapentin". Vaccination history included: BNT162b2 (DOSE 1, SINGLE, Lot no: GN6206), administration date: 08Mar2021, for Covid-19 Immunization, reaction(s): "Arm was really red", "Had a rash on the arm", "Arm was hot to the touch", "Swollen arm", "fluctuations on her heart rate", "a fast heart beating", "saw everything blurry", "a feeling that she was going to faint", "Anxiety", "Panic attacks". The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (non-serious) with onset 22Apr2022, outcome "unknown"; ERYTHEMA (non-serious), outcome "unknown", described as "Arm was really red"; RASH (non-serious), outcome "unknown", described as "Had a rash on the arm"; FEELING HOT (non-serious), outcome "unknown", described as "Arm was hot to the touch"; PERIPHERAL SWELLING (non-serious), outcome "unknown", described as "Swollen arm"; HEART RATE IRREGULAR (non-serious), outcome "unknown", described as "fluctuations on her heart rate"; HEART RATE INCREASED (non-serious), outcome "unknown", described as "a fast heart beating"; VISION BLURRED (non-serious), outcome "unknown", described as "saw everything blurry"; DIZZINESS (non-serious), outcome "unknown", described as "a feeling that she was going to faint"; ANXIETY (non-serious), outcome "unknown"; PANIC ATTACK (non-serious), outcome "unknown", described as "panick attacks". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Verbatim term: Arm was really red. Had a rash on the arm. Arm was hot to the touch. Swollen arm. Arm was red for 10 days. She experienced fluctuations on her heart rate and a fast heart beating. Had some episodes were she saw everything blurry, she had a feeling that she was going to faint, felt she was going to pass out. Anxiety, panic attacks. Couldn't control what was happening.  Follow-up attempts are completed. No further information is expected.