First dose: blood pressure dropped; First dose: platelets dropped; First dose: saw blinking lights; Felt imbalanced; This is a spontaneous report from a Pfizer sponsored program. A contactable consumer reported for himself. A male patient of an unspecified age received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Solution for injection, Batch/Lot number was not reported), dose 1 via an unspecified route of administration on 17Feb2021 at 11:20 as dose 1, single for covid-19 immunisation. Medical history included immune thrombocytopenia from Apr2018 to an unknown date (patient was diagnosed in Apr2018. patient had gone for some routine blood work for a routine colonoscopy and the doctor's office called him and told him to go to emergency department because his platelets were 17,000. Patient was in the hospital until 23Apr2018. The hospital reran the platelet test and it was 19,000. Patient had no bleeding and no bruising, he was fine and ultimately discharged. After his diagnosis in Apr2018 of idiopathic thrombocytopenia he was getting his blood drawn often like twice a week, then once a week, then once every 2 weeks and now he gets his blood drawn in the first week of every month). The patient's concomitant medications were not reported. On an unspecified date, the patient reported that With the first dose his blood pressure dropped and his platelets dropped based on lab work he had done. His platelet count was 174,000 but after the first Covid 19 vaccine it dropped. He has the exact platelet numbers in his paperwork. He checks his blood pressure twice a day. Before he got the first Covid 19 vaccine his blood pressure was 126 mmHg systolic. And after the vaccine he was working and walking, and he saw blinking lights so he knew that his blood pressure was to low or to high. He checked his blood pressure, and it was 95 mmHg systolic. He knows how it feels when his blood pressure drops. He doesn't necessarily notice if his blood pressure drops from 125 mmHg to 115 mmHg over the course of a day. He received his vaccine at around 11:25 AM in the morning and he went into a delicatessen at about 12:10 PM and he knew his blood pressure was on the low side. When he checked his blood pressure when he got home it was 107 mmHg systolic. He reports he had a test in the beginning of Feb2021 and on 22Feb2021 he saw his pulmonologist. He said he wondered how his platelets are doing. He states that people who are infected with the Covid 19 virus have platelets that drop. He states the Covid 19 vaccine is an mRNA vaccine and manufactured with a spike protein that get his antibodies up. His platelets were below 110,000, then dropped to 75,000. He thought maybe the platelet test was a fluke with the first dose, the adverse event was a drop in his blood pressure, here my blood pressure when before he got, he will read from here, he received the first dose at 11:20 AM on 17Feb2021, he dropped home stopping at the market at about 10 clock PM as if in the car he felt imbalanced he measure the blood pressure at home at 13:02 it was 107/66/72 means systolic, diastolic and both, at 8:02 AM in the morning was the 127/72/69. On 22Feb2021, he got blood drawn for lab work and he have a test, he also (statement incomplete) lab work on 05Feb2021. Prior to the second vaccine his platelets recovered, no problem to 180,000. The outcome of the events platelets dropped was resolved and unknown for other events.  Follow-up attempts are needed. Further information is expected.