Right arm ached for over aweek/Sore broke out on right arm; This case has been considered as invalid since there was no significant valid information with regards to any adverse event with BNT162B2  This is a spontaneous report from a contactable consumer. This consumer reported that:  Reaction(s)/Event(s) Reaction/event as reported by primary source : I had knee replacement six weeks ago, I have to crown in my mouth and I am going to have a dental procedure done, If I can take the Cefalexin the soon after having the Covid vaccination    Drug(s) Information: Characterization of drug role: Suspect Proprietary medicinal product name: Covid 19 Vaccine   Batch/lot number: EN6200   Action(s) taken with drug: Unknown  Narrative case summary and further information: Case narrative:  Submitted by Call Centre 1 Ref: # Selected Report Type: Initial Reporter type: Consumer or other non-health professional Reporter telephone: # Primary / Prescribing Healthcare Professional Info HCP postal address:   Dates for I had knee replacement six weeks ago, I have to crown in my mouth and I am going to have a dental procedure done, If I can take the Cefalexin the soon after having the Covid vaccination: (From: Unspecified To: Unspecified)  Is Covid vaccine a Pfizer product? Yes Covid vaccine manufacturer: Unspecified Dates for Covid vaccine: (Start: Unspecified Stop: Unspecified) NDC number of Covid vaccine: Unknown UPC number of Covid vaccine: Unknown Expiry Date of Covid vaccine: Unknown  Additional Context:  Concern: Consumer stated, "I had knee replacement six weeks ago. I had the Covid the Pfizer vaccine on Friday. I am going in tomorrow because I have to crown in my mouth and I am going to have a dental procedure done and they have prescribed me Cefalexin. I wondering if I can take the Cefalexin the soon after having the Covid vaccination. Is it going to do harm to the vaccination?"  When consumer was informed about the Pfizer Medical Information: Consumer stated, "Am I gonna be on phone for another several hours? She gave me to a wrong person. That you don't have any idea?"  When probed if the consumer has taken the Pfizer Covid vaccine: Consumer stated, "Yes." LOT# and Expiration date: Consumer stated, "EN6200, I don't have the expiration date on it." Follow up: Consumer stated, "Yes, why would they need to? okay I don't care." Emails: Consumer stated, "I don't want the emails."  Follow-up (02Apr2021): The initial case was missing the following minimum criteria: no adverse effect. Upon receipt of follow-up information on (02Apr2021), this case now contains all required information to be considered valid. New information update: (Patient's age was added.AE verbatim "Right arm ached for over aweek/Sore broke out on right arm" was coded to pain in extremity. Action taken, DC, RC were captured as Not applicable.)  A 72-years-old patient of an unspecified gender received second dose of bnt162b2 (BNT162B2, PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot Number: EN6200) via intramuscular in left arm on 19Feb2021 as single dose for covid-19 immunisation. Did not take prior vaccinations within four weeks. Medical history included knee arthroplasty from 04Jan2021 to an unknown date knee replacement six weeks ago and pain. Hydrocodone, Tylenol, and ibuprofen- no pain medications for 4 days after shot. The sore arm and the breakout were on the right arm and shot was on the left arm. Concomitant medication(s) included Mupirocin cream 2 percent (MUPIROCIN) for pain (Open sore). It was reported that on 19Feb2021, the patient experienced right arm ached for over aweek/sore broke out on right arm. Treatment received included was antibiotic ointment. The outcome of the events was recovered on an unspecified date.  No follow -up attempts are needed. No further information is expected.