Booster shot; started experiencing symptoms of vertigo; that the episodes are getting worse; he also fell out of bed; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the parent.  A 17 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 28Dec2021 (Batch/Lot number: unknown) at the age of 17 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose 1), for COVID-19 Immunization, reaction(s): "they both did not have vertigo or did not have the vertigo this severe with at least the first two doses of their Pfizer Covid vaccines"; Bnt162b2 (Dose 2), for COVID-19 Immunization, reaction(s): "they both did not have vertigo or did not have the vertigo this severe with at least the first two doses of their Pfizer Covid vaccines". The following information was reported: IMMUNISATION (non-serious) with onset 28Dec2021, outcome "unknown", described as "Booster shot"; VERTIGO (non-serious) with onset Dec2021, outcome "not recovered", described as "started experiencing symptoms of vertigo"; CONDITION AGGRAVATED (non-serious) with onset Dec2021, outcome "not recovered", described as "that the episodes are getting worse"; FALL (non-serious) with onset Dec2021, outcome "unknown", described as "he also fell out of bed".  Additional information: Caller states she is calling about the Pfizer vaccine booster and states she talked to her son and he also has had the same Pfizer Covid booster vaccine at the same pharmacy and he also had a case of vertigo as well and got it two days ago and she is hoping he does not have long lasting effects of this. She states her son said he also fell out of bed and had the same thing and joked with her saying he remembered when the caller went through this. Caller states she was wondering if since both she and her son are both really skinny and she is pounds and her son is very skinny so maybe the Pfizer Covid booster is maybe a little too strong for her and her son and they both did not have vertigo or did not have the vertigo this severe with at least the first two doses of their Pfizer Covid vaccines and she is not sure what went wrong with her and her son's third doses of the Pfizer Covid vaccine. Caller states she does not know the patient's weight and he is taller than she. Caller states the patient had the Pfizer Covid vaccine booster and she assumes it was similar to her Pfizer Covid vaccine and states she does not know off the top of her head the dates, lots, expiry dates or NDC numbers of the patient's 1st, 2nd or booster doses of his Pfizer Covid vaccines. States she thinks the patient had his first two doses of the Pfizer Covid vaccine in the summertime and it was as soon as it was approved for his age and they allowed him to get it. She found information that this side effect was found on 1% of the population and wanted to know if that is correct and if there is more information on the subject? The time of vaccination was at lunchtime. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine.  The lot number for bnt162b2 was not provided and will be requested during follow up.