seizure; he was white; began to sweat; was confused; couldn't see well, vision was blurry; felt horrible; slept all day; was fatigued; This spontaneous case was reported by a consumer and describes the occurrence of SEIZURE (seizure) in a 29-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 00F21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 10-Oct-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 10-Oct-2021, the patient experienced SEIZURE (seizure) (seriousness criterion medically significant), PALLOR (he was white), HYPERHIDROSIS (began to sweat), CONFUSIONAL STATE (was confused), VISION BLURRED (couldn't see well, vision was blurry), FEELING ABNORMAL (felt horrible), SOMNOLENCE (slept all day) and FATIGUE (was fatigued). On 10-Oct-2021, SEIZURE (seizure), PALLOR (he was white), HYPERHIDROSIS (began to sweat), CONFUSIONAL STATE (was confused), VISION BLURRED (couldn't see well, vision was blurry) and FEELING ABNORMAL (felt horrible) had resolved. At the time of the report, SOMNOLENCE (slept all day) and FATIGUE (was fatigued) was resolving.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 10-Oct-2021, Blood pressure measurement: normal (normal) blood pressure again and it was normal, high (High) blood pressure was super high and low (Low) blood pressure was on the ground. On 10-Oct-2021, Body temperature: temperature was fine (normal) temperature was fine.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       No concomitant medications were provided by the reporter.  It was reported that the patient's Second shot scheduled for 07Nov2021.  Mother reported that Pharmacist took her son's temperature and pressure and everything was fine. Then, pharmacist gave him the vaccine and her son waited 15 min. It wasn't even 5 min that he started with a seizure. She felt that he was going to die. She tried to pick up her son and talk to him. He was white and began to sweat. When he reacted he told me that he was confused and that he couldn't see well. The pharmacist took his blood pressure and it was super high. They called 911. When paramedics arrived, they started taking vital signs and blood. They took his pressure again and it was on the ground, so at first it increased and then it decreased. They put him on the stretcher and raised his feet. He was still confused and white and still sweating. Her son felt horrible. His vision was blurry. Her son did not know what happened to him. They took him to the hospital and little by little he was feeling better. The hospital did not admit him and he wait on the stretcher. By that time, her son was feeling fine. The paramedic took his blood pressure again and it was normal. This lasted about two hours.  When he went to the house he was fatigued by everything that happened. On 11Oct2021, he went to work but on Sunday and slept all day. On 12Oct2021 he told her mother that he felt better than yesterday.  No treatment information was provided by the reporter.  Company Comment-This case concerns a 29-year-old, male patient with no relevant medical history, who experienced the unexpected event of Siezure. The event occurred approximately 1 day (few minutes) after the first dose of mRNA-1273 (Moderna Covid-19 vaccine). The rechallenge was not applicable, as the event happened after the first dose. The event was considered related to the product per the reporter's assessment. The benefit-risk relationship of mRNA-1273 (Moderna Covid-19; Sender's Comments: This case concerns a 29-year-old, male patient with no relevant medical history, who experienced the unexpected event of Siezure. The event occurred approximately 1 day (few minutes) after the first dose of mRNA-1273 (Moderna Covid-19 vaccine). The rechallenge was not applicable, as the event happened after the first dose. The event was considered related to the product per the reporter's assessment. The benefit-risk relationship of mRNA-1273 (Moderna Covid-19 vaccine) is not affected by this report.