The daughter was inadvertently given the Moderna Covid 19 vaccine for her second dose.; The daughter was inadvertently given the Moderna Covid 19 vaccine for her second dose.; Now running a fever of 100.9-101 degrees F; Extremely bad headache; She confirms fever and headache both began 03Oct2021, are ongoing, and worsening.; This is a spontaneous report from a contactable consumer (patient's mother). A 19-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, Solution for injection, Batch/Lot Number: FE3592, expiration date: 30Nov2021), dose 2 via an unspecified route of administration, administered in right arm on 03Oct2021 as DOSE 2, SINGLE; COVID-19 vaccine mRNA (mRNA 1273) (MODERNA COVID-19 VACCINE), via an unspecified route of administration, administered in left arm on 03Oct2021 (Batch/Lot Number: 026021A), as DOSE 1, SINGLE (both at the age of 19-years-old) both for COVID-19 immunization. The patient's medical history was reported as none. The patient's concomitant medications included birth control medication. The patient's historical vaccine included bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, Solution for injection, Batch/Lot Number: FE3184, expiration date: 31Oct2021), dose 1 via an unspecified route of administration, administered in left arm on 08Sep2021 as DOSE 2, SINGLE (at the age of 18-years-old) for COVID-19 immunisation. The patient went to a pharmacy to get her second dose of Pfizer vaccine. The daughter was inadvertently given the MODERNA COVID-19 vaccine for her second dose on 03Oct2021. The pharmacist explained this to the patient and her mother and within 5 minutes gave her a dose of Pfizer Covid 19 vaccine. The patient got both vaccines within 5 minutes of each other. Further explained that daughter was running a fever of 100.9-101 degrees F and has an extremely bad headache on 03Oct2021. The daughter's family doctor told her to give the patient ibuprofen. The patient was running between 100.9 to 101 fevers even with giving her 800mg ibuprofen. The reporter explains daughter has never had a fever/be sick and received 800mg of Ibuprofen and has been advised every 6 hours in-between to get Tylenol. The reporter was seeking advice on fever/pain reducing medication to treat fever and headache that daughter was experiencing. The reporter further stated that they are having to give the patient 800mg of ibuprofen at a time, every 12 hours, and they are only 8 hours in, and she could not get another 800 until 19:00 hours tonight and fever was already at 100.9. She reported that the patient has a really bad headache too. She confirmed fever and headache both began 03Oct2021, are ongoing, and worsening. The events did not require a visit to emergency room or physician office. The doctor wanted the reporter to give the patient 1000mg of Tylenol too. The reporter did not provide any further product information at that time. The patient underwent lab tests and procedures which included body temperature: 100.9 to 101 Fahrenheit on 03Oct2021 fever between 100.9 to 101. Therapeutic measures were taken as a result of the events now running a fever of 100.9-101 degrees F, extremely bad headache and She confirms fever and headache both began 03Oct2021, are ongoing, and worsening. The outcome the events now running a fever of 100.9-101 degrees F, extremely bad headache and She confirms fever and headache both began 03Oct2021, are ongoing, and worsening was not recovered.  No follow-up attempts are needed. No further information is expected.