missed her second dose; still feels terrible; Diarrhea; Flu like symptoms; This is a spontaneous report received from a from a contactable consumer received via Pfizer-sponsored program Support. This consumer (patient) reported for herself that a 87-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection; Batch/Lot Number: EL3249), via an unspecified route of administration, administered at arm left on 07Feb2021 (age at vaccination was 87 year) as dose 1, single for covid-19 immunisation. The patient medical history include allergic to various medication, penicillin allergy, drug allergy to azithromycin and any of the mycin. The concomitant medications were not reported. The caller stated that, she reported that she missed her appointment for her second dose, she has been sick for about 3 days and did not think it was good for her to have the appointment to get her second dose. On an unspecified date, the patient experienced still feels terrible and missed her second dose; on unspecified date in Feb2021, flu like symptoms; on 28Feb2021, diarrhea. The caller said that she had flu like symptoms. Her appointment was at like 09:30, but someone called her and told her there was another appointment available at around 16:00. Caller does not know if she should go get the second shot or if it is contraindicated. She said that she had diarrhea. She said that she still feels terrible. She has some sort of flu like stuff and last night had diarrhea. Stated that this is an old problem with her. She said that she is supposed to have the second shot, but it has been like 3 weeks and a day. She said that her symptoms did not happen immediately, they happened like 3 weeks later, states it is just her body. Height: She stated she may have shrunk about a 0.5 inch. She said that she has not felt good for the last 3 days. She said that she had diarrhea last night and felt terrible during the day. For 3 days she did not feel well like she had the flu or something. She went for her walk day before yesterday, and she walks about a half a mile usually 5 times a week. Caller said that she has a lot of low back pain and has to move because of the pain. She has to keep moving or she will be in bed all the time. She stated that she had the back pain long before she had the Covid-19 vaccine and stated that it was from an injury. States the back pain has nothing to do with the vaccine. Caller said that she feels like she is on the verge of diarrhea and was afraid she would not be able to get out of the bathroom. She has been to the bathroom a few times. When she had bouts of diarrhea before it is constant out of bed and in the bathroom back and forth. This is her body's way of getting rid of whatever bug she could have. States this is seemingly so connected to her coming back to get the second dose, which she confirms she has not received the second dose yet. She said that she does not vomit easily, she usually gets diarrhea instead. Caller said that her left arm is still a little sore. She thinks she asked for it on the left side since she is right-handed. Said that she has a list of other medications that she is allergic to. No further details provided. Caller said her first thought is that she might be allergic to the Covid vaccine. The clinical outcome of events was not recovered. Investigation Assessment: No No follow-up attempts are possible. No further information is expected.