very mild discomfort after the first shot; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) for a Pfizer sponsored program. The reporter is the patient.  A 58 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 26Mar2021 (Lot number: ER8730, Expiration Date: 31Jul2021) at the age of 58 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Diabetes mellitus" (unspecified if ongoing), notes: Not a bad diabetic but diabetic; "High blood pressure" (ongoing); "High cholesterol" (unspecified if ongoing); "metabolic syndrome" (unspecified if ongoing); "increased blood sugar" (unspecified if ongoing); "Lyme disease", start date: 2011 (unspecified if ongoing), notes: He was treated and hospitalized in 2011 for Lyme disease.; "heart attack" (unspecified if ongoing), notes: It was the symptoms of a heart attack one morning that put him in the hospital for a couple of days.; "controlling prostatitis" (ongoing). Concomitant medication(s) included: METFORMIN (ongoing); LISINOPRIL taken for hypertension (ongoing); TAMSULOSIN taken for prostatitis (ongoing); FINASTERIDE taken for prostatitis (ongoing); HYDROCHLOROTHIAZIDE (ongoing). Past drug history included: Erythromycin, reaction(s): "Allergy", notes: He does have an Erythromycin allergy. Vaccination history included: Tetanus (He had a slight negative reaction to the tetanus vaccine. He had not tetanus vaccine recently. It was probably 30 years ago.). The following information was reported: DISCOMFORT (non-serious) with onset 2021, outcome "recovered" (2021), described as "very mild discomfort after the first shot". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information included: He experienced very, very mild discomfort after the first shot.  He had zero discomfort after the second shot. he had no issues with feeling like the cold or flu. He had no physical discomfort with the second shot in terms of being sore. Metformin had been on for many years, at least 4 or 5 years. Lisinopril was low dose, not a very high dose, fairly modest dose. Had been taking 3 or 4 years. The original dose was 10mg, was changed probably a year ago to 20mg, something like that. Tolerates it really well. Concomitant Products Lisinopril used for high blood pressure. Tamsulosin was discontinued roughly around the period of time the symptoms abated. The arrhythmias had started to go down before that. Tamsulosin used for controlling prostatitis. Finasteride was substituted this in for the Tamsulosin. It was about 4 weeks after 18Apr2021. He had been taking with no issues at all. It was not as effective as Tamsulosin but was a little bit better. Finasteride used for controlling prostatitis. Additional Vaccines not administered on Same Date of the Pfizer Suspect. No prior Vaccinations (within 4 weeks). AE(s) following prior vaccinations: Years ago, he had a slight negative reaction to the tetanus vaccine. He had not had a tetanus vaccine recently because of all of that. It was probably 30 years ago. He needs to get a tetanus shot. He was sure he does. He would get one if needed. He had been trying to put off doing that a while. He explains he had enough of a reaction he felt uncomfortable getting another. The caller had no manufacturer or lot number for the product used back then. Product complaint reported: While reporting side effects from the Pfizer COvid-19 vaccine, patient mentioned that he had been on Tamsulosin, to help with controlling prostatitis and some symptoms regarding that sort of things. He was possibly noticed a pattern between the time of day taking Tamsulosin and the time of the day the symptoms regarding heart arrhythmias and palpitations became most profound. It was discontinued and he was started on Finasteride, which does not work as well.  Follow-up attempts are completed. No further information is expected.