blood pressure had dropped a lot/blood pressure dropped a good deal; his heart rate was 30 beats per minute; Not feeling well; Sore arm; felt strange; his bone spur in his heel quit bothering him immediately/he can walk long distance/he would get that real soreness or pulling after a walk and that kind of stopped; This is a spontaneous report from a contactable consumer (patient). A 61-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration, administered in the left arm, on 09Apr2021 (lot number: EW0158), as 1st dose, single, for COVID-19 immunization, at a clinic. Medical history included high cholesterol (controlled with diet); bone spur in left heel (bone spur in his left heel began coming on gradually, probably for 10 or 12 years) which has gotten little worse and made it hard for him to walk in the evening, in long distances, it was like a knife in his heel and he would get that real soreness and pulling after a walk; and allergy to sulfa drugs, more specifically sulfa antibiotics (he was given them 25 years ago and had a reaction). The patient has not had any vaccines or shots for years. He reported that he is very healthy and has not had the flu or anything in 25 years. The patient does not smoke and is careful with what he eats. There were no concomitant medications. On 09Apr2021, within minutes of receiving the first dose of the COVID-19 vaccine, the patient was not feeling well, he felt strange. He wondered if it was his imagination or if something was going on. Then it got worse and worse within 12-15 minutes after the COVID-19 vaccine. The staff member sent paramedics over to him. The paramedics set him up with a blood pressure cuff and heart monitor. Apparently, his blood pressure dropped a lot/dropped a good deal and his heart rate went to 30 beats per minute. His heart rate is normally around 65 beats per minute. The paramedics informed him that if his blood pressure and heart rate didn't come up, he was going to have to go to the hospital. The paramedics instructed him to stand up and it seemed to bring his blood pressure and heart rate back up to normal. The patient reported that everything returned to normal within a 15-20-minute time frame. He was then able to leave the vaccination facility. His health care provider advised him not to take the second dose of the COVID-19 vaccine. His physician informed him that he could possibly go into cardiac arrest. The patient did not have any problems after that other than a sore arm later in the day on 09Apr2021. His arm was sore for a day or two. The patient stated that this was the only effect after the incident in the vaccination facility. The patient also reported that on the weekend after receiving the COVID-19 vaccine, in Apr2021, he can walk long distance and his bone spur in his heel quit bothering him immediately. He reported that if he walks a mile and back, it quit the hurt. He reported that he would get that real soreness or pulling after a walk and that kind of stopped. The patient thought this was really strange. The patient reported that he cancelled the appointment for the second dose and did not get it. He was a little apprehensive about the second dose of as he didn't know if his reaction would be worse. The patient asked if the vaccine is 80% effective after one dose, if Pfizer has heard of that type of reaction from others, if his reaction was rare, and if he should get the second dose of the COVID-19 vaccine. He mentioned that he would like to have a second dose of the Covid-19 vaccine, but he is afraid to get it because he doesn't want to go into cardiac arrest. The patient recovered from "blood pressure had dropped a lot/blood pressure dropped a good deal", "his heart rate was 30 beats per minute", not feeling well and felt strange on 09Apr2021, and from sore arm in Apr2021. The outcome of "his bone spur in his heel quit bothering him immediately/he can walk long distance/he would get that real soreness or pulling after a walk and that kind of stopped" was not recovered.  No follow-up attempts are needed. No further information is expected.