Incontinent; Unable to focus; Muscle weakness; Very unusual adverse reaction/identical severe reaction to booster dose/"off the wall" reaction, terrible; Most horrific side effects; Worst brain fog; Inablity to answer question; dizziness; This spontaneous case was reported by a consumer and describes the occurrence of VACCINATION COMPLICATION (Very unusual adverse reaction/identical severe reaction to booster dose/"off the wall" reaction, terrible), ADVERSE DRUG REACTION (Most horrific side effects), FEELING ABNORMAL (Worst brain fog), INCONTINENCE (Incontinent) and DISTURBANCE IN ATTENTION (Unable to focus) in an 82-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 035C21A, 048A21A and 015M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Diabetes, Coronary artery disease, Polymyalgia rheumatica, Gout, GERD and Hypertension. Concomitant products included ATORVASTATIN for Cholesterol, CLOPIDOGREL for Coronary artery disease, METFORMIN HYDROCHLORIDE (METFORMIN ER) and EMPAGLIFLOZIN (JARDIANCE) for Diabetes, PANTOPRAZOLE for GERD, LOSARTAN and HYDROCHLOROTHIAZIDE (HCT) for Hypertension, CHOLESTYRAMINE and NORTRIPTYLINE for Irritable bowel syndrome, METOPROLOL for an unknown indication.   On 14-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 14-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 29-Oct-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 15-Feb-2021, the patient experienced DIZZINESS (dizziness). On 15-Mar-2021, the patient experienced INCOHERENT (Inablity to answer question). In October 2021, the patient experienced ADVERSE DRUG REACTION (Most horrific side effects) and FEELING ABNORMAL (Worst brain fog). On 30-Oct-2021, the patient experienced VACCINATION COMPLICATION (Very unusual adverse reaction/identical severe reaction to booster dose/"off the wall" reaction, terrible). On an unknown date, the patient experienced INCONTINENCE (Incontinent), DISTURBANCE IN ATTENTION (Unable to focus) and MUSCULAR WEAKNESS (Muscle weakness). On 17-Feb-2021, DIZZINESS (dizziness) had resolved. On 17-Mar-2021, INCOHERENT (Inablity to answer question) had resolved. On 02-Nov-2021, VACCINATION COMPLICATION (Very unusual adverse reaction/identical severe reaction to booster dose/"off the wall" reaction, terrible) had resolved. At the time of the report, ADVERSE DRUG REACTION (Most horrific side effects), FEELING ABNORMAL (Worst brain fog), INCONTINENCE (Incontinent), DISTURBANCE IN ATTENTION (Unable to focus) and MUSCULAR WEAKNESS (Muscle weakness) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   No treatment information was provided.  For concomitant medications Cholestyramine, Nortriptyline product used for indication given as Irritable bowel syndrome.   This case was linked to MOD-2021-377774, MOD-2021-376997 (Patient Link).   Most recent FOLLOW-UP information incorporated above includes: On 02-Nov-2021: Reporter information, Patient details, dose 1 and 2  details were added and updated booster dose start date. Event brain fog was added. On 05-Nov-2021: Significant Follow up, Incoherent event  added. On 05-Nov-2021: Significant: HCP added, additional reporter added, medical history added, concomitants added, patient demographic details added, events start/stop date added, events outcome updated, additional events added. On 08-Nov-2021: Non significant follow up: Reporter E-mail added.