Caller stated the vial had the date of manufacture of Aug2021; Caller stated she asked the patients this morning if they had any side effects and the reply was a little sore arm; 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 10 year-old male patient received bnt162b2 (BNT162B2), administered in arm right, administration date 30Dec2021 (Lot number: FK5127, Expiration Date: 30Apr2022) at the age of 10 years as dose 1 (tris), single for covid-19 immunisation. Relevant medical history included: "winter asthma" (unspecified if ongoing).There were no concomitant medications. The following information was reported: EXPIRED PRODUCT ADMINISTERED (non-serious) with onset 30Dec2021, outcome "unknown", described as "Caller stated the vial had the date of manufacture of Aug2021"; PAIN IN EXTREMITY (non-serious) with onset 30Dec2021, outcome "unknown", described as "Caller stated she asked the patients this morning if they had any side effects and the reply was a little sore arm".  Additional information:The caller was a mother, stated that the patients got the first dose of the Pfizer Covid-19 vaccine,  the orange cap. The patients were 10 year old male and a 6 year old female. The caller stated that she asked them if they had any side effects and they said that they had a little sore arm but nothing major. The caller stated her other concern is that she saw that the vial had the manufacture date of Aug2021. She was very upset and was wondering if it was still ok to use. She provided the LOT: FK5127. She lost sleep last night because she was very worried and very con-cerned that they were given a vial that was not in date. Clarified that all of this had been addressed with the transferring agent. Clarified again that it was a 10 year old male and a 6 year old female that received the vaccine yesterday. Clarified with the caller, the details provided by the transferring agent. She states that at the moment, she was kind of nervous. she states they didn't wake her up in the middle of the night and complain about it.Caller statesd hat was what her main concern was. When she got her vaccine, there was a sticker had all of that information. That information was not on their card. That was y she was wor-ried, wondering if it was still safe for them to get the vaccine.  Caller states she just wants to make sure and states she was just concerned that they didn't put the expiration date on there. With the lot number, she wanted to make sure that it was safe for them to get it without knowing the expiration date. Caller states that she wanted to make sure it was legit for them to get this and not get a vaccine without all of the information on the card. Clarified with the caller that she was referring to the vaccine card that did not have this infor-mation, the expiration date. She states that on the card, it just said  Covid pediatric vaccine, or whatever, and just the lot number, yesterdays date and the name of the pharmacy. She states she is not going to go back there for their next vaccine. She just wanted assurancethat they get that in-formation on the card.She states that the agent did say the vaccines have an expiration date of 9 moths and they are still legit. The agent had also stated that just because the manufacture date as in Aug2021, didn't meant that they got it in Aug2021, it could have been manufactured in Aug2021 and they could have gotten them in the beginning of the month or in Nov2021. If it was manufactured in Aug2021, they may not have gotten them in until yesterday.  No follow-up attempts are possible. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202101885479 same product and event, different patient