flu-like symptoms; oxygen saturation is low; having difficulty breathing; experiencing a rapid heart rate/ had tachycardia, fast heart beat; being tested for Covid 19; complaining of feeling unwell since receiving the first dose of the Pfizer Covid vaccine; his nose was very stuffy; needed to blow his nose like 100 times; This is a spontaneous report from a contactable consumer (patient's daughter). A 72-years-old male patient (reporter's father) received the first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, lot number and expiration date was not reported), via an unspecified route of administration, administered in arm on 01May2021 (at the age of 72-years-old) as a single dose for covid-19 immunization. Medical history included hypertension, tachycardia. The patient's concomitant medications were not reported. On 02May2021, the patient was complaining of feeling unwell since receiving the first dose of the Covid vaccine. Caller states father has been having flu-like symptoms. His oxygen saturation was low and he was having difficulty breathing. He was experiencing a rapid heart rate and currently was being tested for Covid 19, he was having chest ray done, and blood work. his heart rate was like 140 and then his oxygen would go down to 80. Caller states she didn't know if Pfizer has ever heard of symptoms like that. Caller states she just wanted to know what was going on, he's in the hospital now. The patient had tachycardia, fast heart beat. Caller states he is 72 years old, he was just laying down and felt his heart really bad, they used a monitor and his heart rate was 140, it was super elevated. Caller states they used the oxygen thing that they put on his finger and the oxygen levels were 80 so it was really low. Caller states he was completely fine, he never went out of the house, he was completely fine, normal. Caller states he does have hypertension though and he drinks medicine for that but she doesn't know which medicine it is. Caller states the first day they applied the vaccine, he felt good. Caller states the second day, he didn't feel good, had flu-like symptoms, his nose was very stuffy, he needed to blow his nose almost 100 times, he was not feeling well at all. Caller states her mom had to take him to the hospital. Reporter enquired if my father could take the second dose since he had this reaction and got answer that should not get COVID-19 Vaccine if you had a severe allergic reaction after a previous dose of this vaccine and had a severe allergic reaction to any ingredient of this vaccine. The patient was taking Pfizer Covid vaccine because he wants to be protected. Caller verifies the patient is continuing to have all symptoms reported still. Caller states he was super healthy and he just went there and took the vaccine and he never goes out, so she doesn't know. Caller reports all of patient's symptoms reported have worsened. Caller verifies it was an injection in his arm, but doesn't know which arm. Caller also unsure of dosage given. Caller states they were like no only Pfizer, so he waited so long for Pfizer and finally when he applied to Pfizer and got it, he was so happy and so now he's so sad because he feels bad. Caller requesting to be transferred to the medical staff at this time. Caller states she doesn't have time to finish the report for her father or herself because her lunch break is almost over. The patient underwent lab tests and procedures on 02May2021 which included heart rate: 140- super elevated , oxygen saturation: 80 -really low , covid-19 positive: positive .The seriousness of the event was considered as serious hospitalisation by reporter. Outcome of the events was not recovered.  Follow up attempts are needed. information about lot/batch number cannot be obtained.