bruising; more fever; more achiness; shot site hurts; Fatigue; arm soreness/Arm hurting, left arm where the vaccine was given; Headache; they are 11 yeas old my kids, twins but they were given the adult doses; grabbed the wrong vial; they are 11 yeas old my kids, twins but they were given the adult doses; grabbed the wrong vial; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID. The reporter is the parent.  An 11-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 04Nov2022 as dose 4 (booster), single (Lot number: GH9697, Expiration Date: 10Jan2023) at the age of 11 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: 3, Lot: FL8095), administration date: 08Aug2022, when the patient was 10-year-old, for COVID-19 immunization; Bnt162b2 (Dose: 1, Lot: FK5618), administration date: Nov2021, when the patient was 10 years old, for COVID-19 immunization; Bnt162b2 (Dose: 2, Lot: FK5127), administration date: Dec2021, when the patient was 10 years old, for COVID-19 immunization. The following information was reported: PRODUCT ADMINISTERED TO PATIENT OF INAPPROPRIATE AGE (non-serious), OVERDOSE (non-serious) all with onset 04Nov2022, outcome "unknown" and all described as "they are 11 yeas old my kids, twins but they were given the adult doses; grabbed the wrong vial"; FATIGUE (non-serious) with onset 05Nov2022, outcome "recovered" (05Nov2022); HEADACHE (non-serious) with onset 05Nov2022, outcome "recovered" (05Nov2022); PAIN IN EXTREMITY (non-serious) with onset 05Nov2022, outcome "recovered" (06Nov2022), described as "arm soreness/Arm hurting, left arm where the vaccine was given"; VACCINATION SITE PAIN (non-serious) with onset 05Nov2022, outcome "recovered" (06Nov2022), described as "shot site hurts"; CONTUSION (non-serious), outcome "unknown", described as "bruising"; PYREXIA (non-serious), outcome "unknown", described as "more fever"; PAIN (non-serious), outcome "unknown", described as "more achiness". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of product administered to patient of inappropriate age, overdose, fatigue, pain in extremity, vaccination site pain. Therapeutic measures were taken as a result of headache.  Additional information: The patient was given the adult doses not the child dose and had fever and they had just fatigue and arm soreness and a headache so nothing, more reaction they had on the kid dose when they had their last booster. Like 3 months ago but nothing critical. The caller was in the room and as per the caller she wrote down the child, but she just grabbed the wrong vial. The reporter stated that he would like to verify the lot number that was given to his children to confirm the dose of the product. He states they are 11 years and one month of age and they were given an adult dosage, rather than the child's. Caller notes the pharmacy will provide an updated vaccination card as well. The reporter stated he had concerned that data may come out in the future stating if you got an adult dose you would not need another dose for 12 amount of months, vs if you received a child's dose then you would need another one at say 6 months instead. He is concerned that someone will say in 6 months if you got a child dose to get another because its less than the adult dose. He noted he wanted to know the formulation for future progress. Caller stated thank God the kids are fine and discussed how they screwed up at the pharmacy and gave the adult dose to kids and they will go through their procedures. He had been advised by his provider, it's not going to affect the kids in the long term, understand side effects and know its not dangerous. Possibly more side effect issues. He proceeded to note he had been told and read through the news where people have received 2 doses at once due to errors while drawing the vaccines. The reporter noted that while his pediatrician did advise possible more side effects, his children had more fever more achiness and are now over it back to school and normal however he noted bruising as well. The father stated, from all the studies, no adverse long term effects that anyone has seen. My kid's shot site hurts still fine.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201280841 same drug/AE, diferent patient;