Felt quite weak, difficulty getting up from bed and so forth; Felt quite weak, difficulty getting up from bed and so forth; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 86-year-old male patient received BNT162b2 (BNT162B2), as dose 3 (booster), single (Batch/Lot number: unknown) and on 05May2022 as dose 4 (booster), single (Batch/Lot number: unknown) at the age of 86 years, in left arm for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (DOSE 1, Pfizer Covid Vaccine, Dates of vaccination, Lot Numbers are unknown), for COVID-19 immunization; Bnt162b2 (DOSE 2, Pfizer Covid Vaccine, Dates of vaccination, Lot Numbers are unknown), for Covid-19 Immunization. The following information was reported: ASTHENIA (non-serious), DYSSTASIA (non-serious) all with onset 06May2022, outcome "recovered" (May2022) and all described as "Felt quite weak, difficulty getting up from bed and so forth".  Additional Information: Other Conditions was no. Investigations was no. Other Products was No. Reporter states that he just wants to explain something and thinks Pfizer might consider it.  States he just received his fourth dose because the doctor recommended it due to the caller's age.  Reporter states that after receiving this shot and his previous Pfizer booster shot; the next day he felt quite weak and had difficulty getting up from bed and so forth. Reporter states that it got to the point where the ambulance had to come and pick him up and sit him down.  Reporter asks if Pfizer can put some notice on the booster shots.  States that he appreciates the shots; but may be a notice saying that the person who gets the shot may have an after effect of weakness, dizziness, and should not attempt to operate machinery or a motor vehicle? Reporter states that he is a doctor, but not a medical doctor.  States that he has a PhD in another field, not medical. Reporter states that he is glad he has the boosters.  He just thinks people should be advised that they may get weak, dizzy, and definitely not to try jumping up or operating a vehicle. Reporter states that his symptoms occurred the day following receiving the booster dose, fourth dose. Caller states that he has recovered completely, states the symptoms were just a one-day situation. Caller does not have his vaccination card available.  He does not know the dates or Lot Numbers for his previous doses of the Covid Vaccine.  Reporter does know that his fourth dose was on last Thursday, 05May2022.  States that this dose was administered in his left arm. Caller denies any other medications, medical conditions, labs, testing, or treatments relevant to these events. Vaccination Facility Type was pharmacy. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available). Reporter has had three previous doses of the Pfizer Covid Vaccine.  Dates of vaccination, Lot Numbers are unknown by the Reporter at time of call. Additional Vaccines Administered on Same Date of the Pfizer Suspect was none. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccine(s) was none. AE(s) following prior vaccinations was none. Patient's Medical History was none. Relevant Tests was none. Reporter asks if Pfizer can put some notice on the booster shots.  States that he appreciates the shots; but maybe a notice saying that the person who gets the shot may have an after effect of weakness, dizziness, and should not attempt to operate machinery or a motor vehicle?  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.