he is having a very intense reaction to the Pfizer; unable to stand up; having a difficult time standing; his back was all sweaty; he was weak; hardly able to talk; Dizzy; he was pale; Interchange of vaccine product; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP).  A male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 12Sep2022 as dose 5 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation; coviD-19 vaccine nrvv ad26 (jnj 78436735) (JANSSEN COVID-19 VACCINE), as dose 1, single (Batch/Lot number: unknown), as dose 2, single (Batch/Lot number: unknown) and as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation; elasomeran (MODERNA COVID-19 VACCINE), as dose 4 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. The following information was reported: HYPERSENSITIVITY (non-serious), outcome "unknown", described as "he is having a very intense reaction to the Pfizer"; DYSSTASIA (non-serious), outcome "unknown", described as "unable to stand up; having a difficult time standing"; HYPERHIDROSIS (non-serious), outcome "unknown", described as "his back was all sweaty"; ASTHENIA (non-serious), outcome "unknown", described as "he was weak"; GAIT DISTURBANCE (non-serious), outcome "unknown", described as "hardly able to talk"; DIZZINESS (non-serious), outcome "unknown", described as "Dizzy"; PALLOR (non-serious), outcome "unknown", described as "he was pale"; INTERCHANGE OF VACCINE PRODUCTS (non-serious), outcome "unknown", described as "Interchange of vaccine product".  Additional information: This is the second case out of 2 cases. Reporter stated that she was calling for her husband. ("Yesterday, we both had the Pfizer booster the bivalent (Pfizer COVID-19 Vaccine Bivalent). This was our fifth vaccine. My husband has had two (Later Reporter stated, "He had two regular Johnson and Johnson, one booster Johnson and Johnson.") Johnson and Johnson vaccine (COVID-19 Vaccine) and then one Moderna Booster (COVID-19 Vaccine) before and then 6 months later or post to 6 months later he had the Pfizer Booster yesterday and I also had the Pfizer Booster yesterday. However, he was just the opposite he had very mild reaction to Johnson and Johnson and Moderna but he was having a very intense reaction to the Pfizer. He was unable to stand up, his back was all sweaty, he was pale, he was weak. I do not know what to do. I am little frightened is that normal? Is that a normal reaction?" When paraphrased the concern: Reporter stated, "Right when I was asking him what was happening, he was hardly able to talk, and his back was back was all sweaty and he was dizzy and he was having a difficult time standing. He was feeling a little better now, but I am concerned. I just want to know could I get him  in case it was like an allergic reaction, is that okay?" Reporter was informed about the role of Pfizer Drug Safety and Pfizer Medical Information department. When probed to clarify the suspect product as COVID-19 Vaccine and manufacturer: Reporter stated, "Let me just ask him. He had two regular Johnson and Johnson, one booster Johnson and Johnson and one booster Moderna and then he had yesterday the Pfizer booster. He had very little reaction to the other four, hardly any but he was having a very much stronger reaction with Pfizer, and I was concerned because he was having a hard time standing up, feeling dizzy and he was all sweaty, his back was all sweaty." LOT# (Pfizer COVID-19 Vaccine Bivalent): its looks almost like GJ but may be that was just a mistake, but I think it was CJ2524 or GJ2524. His kind of looks like GJ2524 but that could just be the line from J. I am not sure. The Pharmacist his handwriting was just a flop.")  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.; Sender's Comments: Linked Report(s) : PFIZER INC-202201160228 Same product and event, different patient;