I do have a very mild headache today.; The next day I felt tired but had no other symptom. today, 05Oct I am better but a little tired.; 03Oct2022 I awoke with vertigo for a few seconds and then felt dizzy and generalized weak that day; 03Oct2022 I awoke with vertigo for a few seconds and then felt dizzy and generalized weak that day; 03Oct2022 I awoke with vertigo for a few seconds and then felt dizzy and generalized weak that day; Interchange of vaccine products; This is a spontaneous report received from contactable reporter(s) (Physician). The reporter is the patient.  An 83-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 15Sep2022 at 12:00 as dose 4 (booster), single (Batch/Lot number: unknown) at the age of 83 years, in right arm for covid-19 immunisation. The patient's relevant medical history included: "Macular degeneration" (unspecified if ongoing); "COVID" (unspecified if ongoing), notes: If covid Prior vaccination: Yes. The patient's concomitant medications were not reported. Past drug history included: Doxycycline, reaction(s): "dizzy", notes: dizzy; Doxycycline, reaction(s): "allergy". Vaccination history included: coviD-19 vaccine moderna (DOSE 3, Batch/Lot No: Unknown; Location of injection: Arm Right; Time: 04:00 PM), administration date: 09Apr2022, when the patient was 82-year-old, for COVID-19 Immunization; BNT162b2 (DOSE 2; Pfizer; Location of injection: Arm Right), administration date: 03Oct2021, when the patient was 82-year-old, for Covid-19 immunization; BNT162b2 (DOSE 1; Location of injection: Arm Right; Vaccine Administration Time: 12:15 PM), administration date: 14Jan2021, when the patient was 81-year-old, for Covid-19 immunization. The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (non-serious) with onset 15Sep2022, outcome "unknown"; VERTIGO (non-serious), DIZZINESS (non-serious), ASTHENIA (non-serious) all with onset 03Oct2022 at 04:00, outcome "recovering" and all described as "03Oct2022 I awoke with vertigo for a few seconds and then felt dizzy and generalized weak that day"; FATIGUE (non-serious) with onset 04Oct2022 at 04:00, outcome "recovering", described as "The next day I felt tired but had no other symptom. today, 05Oct I am better but a little tired."; HEADACHE (non-serious) with onset 05Oct2022 at 04:00, outcome "recovering", described as "I do have a very mild headache today.". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of vertigo, dizziness, asthenia, fatigue, headache.  Additional information: Pfizer vaccine given 15Sep2022. No immediate reaction. 03Oct2022, patient awoke with vertigo for a few seconds and then felt dizzy and generalized weak that day. The next day (04Oct2022), patient felt tired but had no other symptom. Today, 05Oct2022, patient was better but a little tired. Patient's temperature, pulse, SP02 and blood pressure were normal. Patient does have a very mild headache today. No respiratory symptoms. Home covid tests 04Oct2022 and 05Oct2022 were normal. After patient's 3rd dose which was Moderna reported had a severe headache the next day lasting one day. Patient have no change in medications and do not have cardiovascular disease or neurological disease.   The information on the batch/lot number for BNT162b2, BNT162b2 omi ba.4-5 has been requested and will be submitted if and when received.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201207870 same patient, different vaccine dose/AE.;US-PFIZER INC-202201207871 same patient, different vaccine dose/AE.;