Arm was sore and swollen; fever; body ache; stomach ache; Arm was sore; headache; fatigue; My children were given an unknown concentrated dose of Covid-19 Vaccine/Second dose vaccine administered improperly; received over 2ml of the vaccine, not 0.3ml or 0.2ml as necessary; sick; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team for a Pfizer sponsored program (005570). The reporter is the parent.  A 14 year-old male patient received bnt162b2 (BNT162B2), administered in deltoid right, administration date 02Feb2022 (Lot number: 33036BD) at the age of 14 years as dose 2, single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1, Batch/lot number: 33036BD, Route of administration: Deltoid, doesn't know which arm), administration date: 12Jan2022, when the patient was 14 years old, for Covid-19 immunization. The following information was reported: PRODUCT ADMINISTRATION ERROR (non-serious) with onset 02Feb2022, outcome "unknown", described as "My children were given an unknown concentrated dose of Covid-19 Vaccine/Second dose vaccine administered improperly"; OVERDOSE (non-serious) with onset 02Feb2022, outcome "unknown", described as "received over 2ml of the vaccine, not 0.3ml or 0.2ml as necessary"; ILLNESS (non-serious) with onset Feb2022, outcome "unknown", described as "sick"; PERIPHERAL SWELLING (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "Arm was sore and swollen"; PYREXIA (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "fever"; PAIN (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "body ache"; ABDOMINAL PAIN UPPER (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "stomach ache"; PAIN IN EXTREMITY (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "Arm was sore"; HEADACHE (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "headache"; FATIGUE (non-serious) with onset 03Feb2022, outcome "recovered" (Feb2022), described as "fatigue".  Additional information: The reporter is the parent of the 3 patients, kids who are 14, 11 and 8 to received unknown concentrated second dose Pfizer COVID 19 Vaccine on 02Feb2022. The second dose Pfizer COVID 19 Vaccine was administered improperly over 2ml of the vaccine, not 0.3ml or 0.2ml as necessary, but a lot. The kids were okay a week later but were sick. The patient Arm was sore later the evening of 03Feb2022. The patient's arm was sore and swollen. The patient's arm did not hurt anymore or felt fine. Then on 03Feb2022, the patient had fever, body ache, stomach ache and headache. The patient was very fatigued. The fatigue lasted the longest. The reporter Can't pinpoint the day the fatigue resolved. The morning of 03Feb2022 when the patient woke up for school and didn't' go to school is when the fatigue began. The reporter stated that everything resolved yesterday, 07Feb2022 or the day before 06Feb2022. Reporter clarifies by everything resolving, the caller means, fever, body ache, stomach ache, headache, sore arm and fatigue resolved yesterday 07Feb2022 or the day before, 06Feb2022. The reporter stated the patient recovered completely from fever, body ache, stomach ache, headache, arm being sore and fatigue. Reporter seriousness for The next morning, 03FEB2022 when woke up to go to school had a fever was Unspecified. The reporter stated height of the patient was 5' 9.5, then clarifies between 5'9 and 5'10 and weight as 125 or 130.Sender's Comments: Linked Report(s) : US-PFIZER INC-202200229780 Same reporter/drug/AE, different patient;US-PFIZER INC-202200229781 Same reporter/drug/AE, different patient.