was injected "twice on right arm; Sluggish; Wrong technique in device usage process; low grade fever between 99F-101F; Pink and puffy at the site of the injection; Pink and puffy at the site of the injection; This spontaneous case was reported by a consumer and describes the occurrence of ACCIDENTAL OVERDOSE (was injected "twice on right arm), SLUGGISHNESS (Sluggish), WRONG TECHNIQUE IN DEVICE USAGE PROCESS (Wrong technique in device usage process), PYREXIA (low grade fever between 99F-101F) and VACCINATION SITE ERYTHEMA (Pink and puffy at the site of the injection) in a male patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 002B21A and 014M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Open heart surgery (In isolation since) in December 2019. Previously administered products included for an unreported indication: HEPATITIS B VACCINE. Concomitant products included ACETYLSALICYLIC ACID (ASPIRIN (E.C.)), ROSUVASTATIN CALCIUM (CRESTOR), METOPROLOL, CALCIUM FRUCTOBORATE, CHONDROITIN SULFATE SODIUM, GLUCOSAMINE HYDROCHLORIDE, HYALURONIC ACID (MOVE FREE JOINT HEALTH), MINERALS NOS, VITAMINS NOS (CENTRUM A TO ZINC) and NAPROXEN SODIUM (ALEVE) for an unknown indication.   On 26-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 26-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 26-Mar-2021, the patient experienced ACCIDENTAL OVERDOSE (was injected "twice on right arm), SLUGGISHNESS (Sluggish), WRONG TECHNIQUE IN DEVICE USAGE PROCESS (Wrong technique in device usage process), PYREXIA (low grade fever between 99F-101F), VACCINATION SITE ERYTHEMA (Pink and puffy at the site of the injection) and VACCINATION SITE SWELLING (Pink and puffy at the site of the injection). On 26-Mar-2021, ACCIDENTAL OVERDOSE (was injected "twice on right arm) had resolved. On 28-Mar-2021, PYREXIA (low grade fever between 99F-101F) had resolved. At the time of the report, SLUGGISHNESS (Sluggish) was resolving and VACCINATION SITE ERYTHEMA (Pink and puffy at the site of the injection) and VACCINATION SITE SWELLING (Pink and puffy at the site of the injection) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 26-Mar-2021, Body temperature: between 99-101 f (abnormal) Between 99-101 F. In 2021, HIV antibody: pending Pending. In 2021, Hepatitis B: pending Pending. In 2021, Hepatitis C: pending Pending.         Additional information: Patient stated that nurse injected needle in his arm and then said, "wrong needle," and again gave him another injection so he could get "full" vaccination.  Patient felt medication going into his arm with both injections. Reporter not sure if 1st injection was from last patient, or if he was given 2 injections of Moderna vaccine at the same time. Low grade fever resolved after taking acetaminophen (TYLENOL) q4hrs x 2 days.  Patient went to urgent care after consulting with HCP to get tested for HIV, Hepatitis B, and Hepatitis C (results pending).   Patient has follow-up with HCP regarding this issue.; Sender's Comments: This report refers to a case of accidental overdose for mRNA-1273 (lot # unknown) with associated AE reported of sluggishness, fever, vaccination site erythema, and vaccination site swelling.