a feeling of pressure on his chest; Bilirubin was 970; liver had gone into overdrive; all of the other liver tests were through the roof; Weakness; feel sluggish; having no stamina; This is a spontaneous report from a contactable consumer or other non hcp (patient) via medical information team. A 66-year-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, formulation: solution for injection) via an unspecified route of administration, administered in left arm on 02Feb2021 12:00 PM (at the age of 66 years) as dose 1, single dose for covid-19 immunization. Patient stated that took vaccine because he wanted to try and get as much protection as could from the virus. No additional vaccines administered on same date of the pfizer suspect, no prior vaccinations within 4 weeks. No adverse events following prior vaccinations. The patient's medical history reported as none and the patient's concomitant medications were not reported. On unspecified date in Feb2021, the patient experienced a feeling of pressure on his chest and hospitalized, on 14Feb2021, the patient bilirubin was 970 and liver had gone into overdrive and all of the other liver tests were through the roof, on 08Feb2021, patient feel sluggish and having no stamina, on 09Feb2021, patient experienced weakness. He saw the gastro doctor a week after being in hospital and had another blood test and also visited emergency room due to the adverse events. The patient was hospitalized for a feeling of pressure on his chest from 14Feb2021 to 15Feb2021. It was reported that patient received the first dose on 02Feb2021 and one week later he was at the gym. He had no stamina, felt sluggish and had this feeling throughout the weekend. On Saturday he felt pressure on his chest. On sunday morning he decided he was going to go and get it checked. He went to the hospital, soon as mention pressure on chest or pain they do all the heart studies. They tested everything and nothing was wrong with the heart. He also had blood test and they checked his liver. It was determined his liver had gone into overdrive. His bilirubin was 970 and every other liver test was through the roof. He later clarified he was admitted to the hospital one night, overnight. He was admitted Sunday 14Feb2021 because of the chest pressure. He went that morning and was admitted to the cardiac unit because they were thinking he was having heart problems. They did all the heart test and he was cleared. They did further blood test and that's when found out liver panel was off. He stated he inquired if this is from the covid shot; his doctor did not know and his doctor said the only outlier they see is the vaccine he took and if it was the vaccine, do not take the second shot because the liver might not recover. His doctor cannot say it was or was not the shot, but this was the only outlier, the covid-19 shot shot was the only thing different that was introduce into his body before liver started messing up. Patient has seen studies that have been done that 19 people had liver problems but no one was even close to the liver numbers he had. He stated he is not adverse to the shot but is now adverse to the second shot unless someone can tell him and asks if there is a recommendation or a doctor in Pfizer he can call. Patient wants to know if he can receive the second dose and what could happen with a second shot and asks if Pfizer does that. He did not take the second shot. He has also not taken the booster shot. He was informed if this was from the covid-19 shot and he got it again it could wipe out his liver out and he would end up needing a transplant. He has read where there have been studies of a few people having liver problems after the covid-19 shot and he guesses he is part of that group. Patient stated as a whole it took six weeks for his liver to get back to normal. However, in regard to no stamina and sluggish he started to feel back to normal around 22Feb2021. He confirmed he feels he has recovered completely from this. Patient stated that it took until 26Feb2021 before he felt like himself again. The patient underwent lab tests and procedures which included bilirubin test results 970 and increased on 14Feb2021, blood test results found out liver panel was off on unspecified date, blood test results unknown on unspecified date, hepatitis a virus test results negative on unspecified date, hepatitis b and hepatitis c virus test results negative on unspecified date, liver function test results shows abnormal on unspecified date and had tested for mono and another virus which were all negative. He has had blood work that monitored the progression of his liver. It took 6 weeks for it to clean it self out and get back to normal. Therapeutic measures were taken as a result of bilirubin was 970, liver had gone into overdrive and all of the other liver tests were through the roof, treatment included IV fluid and that's it to try and flush liver. The outcome of the event a feeling of pressure on his chest was recovered on 26Feb2021, bilirubin was 970, liver had gone into overdrive and all of the other liver tests were through the roof was recovered on unspecified date in Mar2021, feel sluggish and having no stamina recovered on 22Feb2021, for event weakness it was unknown.    The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.