Moderna Vaccine: Date: 07Sep2021/04Feb2021 Name and Dose of Vaccine: Consumer stated, "It is the Pfizer."; felt faint like about to fall forward and the weird thing is it happens every time get the shot; got sick again; woke up convulsing with chills, cold, shaking; woke up convulsing with chills, cold; woke up convulsing with chills; Headache; nauseous; dizzy; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 52-year-old male patient received bnt162b2 (BNT162B2), as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medication(s) included: LANTUS; HUMALOG. Vaccination history included: moderna vaccine (Dose 1, Single, Batch/lot no: 011L20A), administration date: 06Jan2021, for COVID-19 immunisation, reaction(s): "felt faint like about to fall forward and the weird thing is it happens every time get the shot", "woke up convulsing with chills", "woke up convulsing with chills, cold", "woke up convulsing with chills, cold, shaking", "nauseous", "Headache", "dizzy", "got sick"; moderna vaccine (Dose 2, Single, Batch/lot no: 939902), administration date: 07Sep2021, for COVID-19 immunisation, reaction(s): "dizzy", "Headache", "nauseous", "woke up convulsing with chills, cold, shaking", "woke up convulsing with chills, cold", "woke up convulsing with chills", "got sick", "felt faint like about to fall forward and the weird thing is it happens every time get the shot". The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (medically significant), outcome "unknown", described as "Moderna Vaccine: Date: 07Sep2021/04Feb2021 Name and Dose of Vaccine: Consumer stated, "It is the Pfizer.""; SYNCOPE (medically significant), outcome "unknown", described as "felt faint like about to fall forward and the weird thing is it happens every time get the shot"; ILLNESS (non-serious), outcome "unknown", described as "got sick again"; TREMOR (non-serious), outcome "unknown", described as "woke up convulsing with chills, cold, shaking"; NASOPHARYNGITIS (non-serious), outcome "unknown", described as "woke up convulsing with chills, cold"; CHILLS (non-serious), outcome "unknown", described as "woke up convulsing with chills"; HEADACHE (non-serious), outcome "unknown"; NAUSEA (non-serious), outcome "unknown", described as "nauseous"; DIZZINESS (non-serious), outcome "unknown", described as "dizzy". Therapeutic measures were taken as a result of syncope, illness, tremor, nasopharyngitis, chills, headache, nausea, dizziness. Clinical course: Consumer stated that after recent dose (Dose 5) 12 hours later around 3:15 in the morning he woke up convulsing with chills, cold, shaking. He had to use four blankets to warm up and then around at 7, he got hot and took it off and then around 07:30 got cold again and had been in bed all day covered with the three big heavy blankets and he was nauseous, had headache, was dizzy, felt faint like he was about to fall forward and the weird thing was it happened every time he got the shot, every time he got a COVID shot. The first two were Moderna (Moderna COVID-19 Vaccine) and for Pfizer he had the similar side effects, so the last three he took Pfizer because they were out of Moderna, they were doing one of the other so they said either one would work, it was okay to mix them and so the patient took it and got sick again. Patient was 54 and it started with the 53, 52, 51 four shots. Every time they put he had one. He was roughly 315 (Pounds).  The information on the batch/lot number for bnt162b2 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202300312095 Same patient/vaccine, different dose/event;US-PFIZER INC-202300312081 Same patient/vaccine, different dose/event;