liver numbers were too high; dehydrated from not eating and drinking much; shivering; tired; fever; was not able to eat; He was bed and could not get up; he was very sick/ ill; legs were weak; This is a spontaneous report from a contactable consumer (patient's sister). A 70-year-old male patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection; Batch/Lot Number: EW0198; expiry date: unknown) via an unspecified route of administration in arm on 09Jul2021 (age at vaccination of 69-year-old) as dose 1, single for covid-19 immunization. Medical history included diagnosed allergies, compromised immune status, respiratory illness,genetic/chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity. Concomitant medications were not reported.There was no history of all previous immunization with the Pfizer vaccine considered as suspect and no additional vaccines administered on same date of the Pfizer suspect. There were no prior vaccinations within 4 weeks and no adverse events following prior vaccinations, The family medical history relevant was unknown. The patient previously took flu shot 25 Years ago.In Jul2021, the patient experienced Lower extremities weakness of and on 09Jul2021, the patient was Unable to eat, Bedridden, Sickness, Tiredness, Fever and on 10Jul2021, the patient experienced Dehydration, Shivering and on 12Jul2021, the patient experienced Liver function tests NOS abnormal.It was reported patient was healthy and never had a problem prior to the Pfizer Covid vaccine, he had tested in Apr2021 for everything, and his lab test results number were good a year before. He goes to doctor every year for whole body test. So, they had something to compare to. That was how they knew it was the vaccine.Caller stated that her brother got the first dose of Pfizer BioNTech covid-19 vaccine on 09Jul2021 and had horrible reaction. She stated that he was not feeling okay and felt very tired, also experienced fever which got worse and worse, and days went by. Caller also stated that he took bath, was shivering and he had to go to bed. He couldn't get, his legs were weak and was prescribed antibiotic by his doctor which somehow made him feel a little better.On 10Jul2021, they called an ambulance for him and took him to emergency room.  On 10Jul2021, he was put on IV, because he was dehydrated from not eating and drinking much. He also went to ER on 11Jul2021, and had some viral tests done to him. He visited his primary doctor who said to take him to the hospital because the test she could do was not enough.On 12Jul2021, the doctor gave him an antibiotic (name dose, lot and expiration date was not reported) because she thought he had Lyme disease and that is when the fever stopped and he was ok, after the antibiotic. On 13Jul2021, he saw an infectious disease doctor and they did tests for sepsis and Lyme disease. They thought it was Lyme disease, but it came back negative. He still had a fever and took Motrin and Tylenol. He was schedule for a sonogram of stomach on 30Jul2021 and was doing many tests that they do not have the results back for yet. He was very ill for 5 days; he was sick on 09Jul2021 through 12Jul2021.He was shivering. He came home and was feeling tired and fever started. He was so tired after that, he went to bed. The doctor and Pfizer said vaccine would give you a fever and make you feel tired. anything that they said, he had it. The fever went up and down because of the Motrin and the Tylenol. He took a bath and was shivering and he had to go to bed. He did not want to eat anything. He was very sick so the doctor wanted him to have the blood work and saw an infectious disease doctor. The fever was on and off while he was taking Motrin and Tylenol (dose, lot, and expiration of each medication was not reported) every 6 hours because the fever kept coming back every 6 hours. He was not able to eat, could not get up and was in bed. The following week, the test results came back, and numbers for blood test were out of whack for his liver. His liver numbers were too high and that nobody knows what was going on. He got test back and they are improved and back to normal. On 14Jul2021 he was better but had fever. The patient was not hospitalized for adverse events. The patient was supposed to get the second dose on 30Jul2021 but couldn't get since they were just waiting for the lab test results and additional advice from the doctor. He did not have a second dose yet .Caller wanted to know if her brother can still get the 2nd dose of the Pfizer BioNTech Covid-19 Vaccine after the side effects that he experienced after the first dose.The patient underwent lab tests which included in Apr2021 whole body test: no problem, on 10Jul2021 viral tests: unknown results, on 12Jul2021 tested for Lyme disease and sepsis disease: negative results and in Jul2021, liver function test: too high and they are improved and back to normal, blood test: numbers for blood test were out of whack for his liver.On 12Jul2021, the patient recovered from illness, the outcome for event muscular weakness and dehydration was unknown and patient was recovering from rest of the events.