Never had sessional allergies, now developed them. Worse flu like symptoms ever in my life. To the point couldn't do anything but to use the bathroom or eat. A lot of hair loss. Quite a reaction to the booster / All symptoms of the vaccine./There are funny things that have now which  didn't before; she was really sick; Not immunocompromised patient receiving 100mcg booster dose; This spontaneous case was reported by an other health care professional and describes the occurrence of SEASONAL ALLERGY (Never had sessional allergies, now developed them.), INFLUENZA LIKE ILLNESS (Worse flu like symptoms ever in my life.), IMPAIRED WORK ABILITY (To the point couldn't do anything but to use the bathroom or eat.), ALOPECIA (A lot of hair loss.) and VACCINATION COMPLICATION (Quite a reaction to the booster / All symptoms of the vaccine./There are funny things that have now which  didn't before) in a 71-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Latex allergy (Latex which causes redness.).   On 28-Oct-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 100 microgram. On an unknown date, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 100 microgram. On an unknown date, received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 100 microgram. On 28-Oct-2021, the patient experienced ACCIDENTAL OVERDOSE (Not immunocompromised patient receiving 100mcg booster dose). On an unknown date, the patient experienced SEASONAL ALLERGY (Never had sessional allergies, now developed them.), INFLUENZA LIKE ILLNESS (Worse flu like symptoms ever in my life.), IMPAIRED WORK ABILITY (To the point couldn't do anything but to use the bathroom or eat.), ALOPECIA (A lot of hair loss.), VACCINATION COMPLICATION (Quite a reaction to the booster / All symptoms of the vaccine./There are funny things that have now which  didn't before) and ILLNESS (she was really sick). At the time of the report, SEASONAL ALLERGY (Never had sessional allergies, now developed them.), INFLUENZA LIKE ILLNESS (Worse flu like symptoms ever in my life.), IMPAIRED WORK ABILITY (To the point couldn't do anything but to use the bathroom or eat.), ALOPECIA (A lot of hair loss.), VACCINATION COMPLICATION (Quite a reaction to the booster / All symptoms of the vaccine./There are funny things that have now which  didn't before), ILLNESS (she was really sick) and ACCIDENTAL OVERDOSE (Not immunocompromised patient receiving 100mcg booster dose) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No Concomitant medication were reported. Patient received by mistake an autoimmune dosage for the booster dose. Paitent was supposed to get the 50mcg booster dose and got the 100mcg booster dose. Patient was not immunocompromised. Patient wanted to know that paitent should do with the 2nd booster dose. Paitent had not had Covid test. As Treatment they reported that taken Over the counter medication.   Most recent FOLLOW-UP information incorporated above includes: On 07-Apr-2022: Follow-up  received contain  Significant information contain Reporter details added from consumer to Other health care professional, Events added.