Second dose: Aches; Second dose: Pains; Second dose: Fatigue; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 77 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 02Mar2021 13:00 (Lot number: EN6199, Expiration Date: 30Jun2021) at the age of 77 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Breast cancer" (unspecified if ongoing), notes: Verbatim: Breast cancer; "Osteoporosis" (unspecified if ongoing), notes: Verbatim: Osteoporosis. Concomitant medication(s) included: ANASTRAZOLE DENK taken for breast cancer (ongoing); BENAZEPRIL taken for blood pressure measurement (ongoing); OMEPRAZOLE taken for hiatus hernia, start date: Jun2021 (ongoing); WARFARIN taken for thrombosis. Vaccination history included: Bnt162b2 (Dose : First dose , Lot: EL9264, NDC: Unknown, this information is not on the CDC vaccine record card. , Expiry: 31May2021, Dose: Unknown strength/volume/dose injection to left arm at unknown time.), administration date: 09Feb2021, when the patient was 76 years old, for COVID-19 immunization. The following information was reported: PAIN (non-serious) with onset 02Mar2021, outcome "recovered" (05Mar2021), described as "Second dose: Aches"; PAIN (non-serious) with onset 02Mar2021, outcome "recovered" (05Mar2021), described as "Second dose: Pains"; FATIGUE (non-serious) with onset 02Mar2021, outcome "recovered" (05Mar2021), described as "Second dose: Fatigue".   Additional Information for Other Conditions: She has had no adverse events with Anastrazole except that it has intensified her osteoporosis.This consumer is the patient who was administered 2 doses of the Pfizer Covid-19 Vaccine and then the booster shot of the Pfizer Covid-19 Vaccine. She was eligible for the booster shot because of being immunocompromised. She had no adverse reaction to the first dose. She reported adverse reactions with the second dose and booster shot.Patient: Ethnicity: documented as provided by reporter.With the second dose she had adverse reactions as expected including aches, pains and fatigue. She just basically slept most of the next day. That did not interfere with her life. She did not feel any of these effects or events until time of onset around 20:00-21:00. The aches and pain weren't severe, she is used to aches and pains because she is getting old. That was not troublesome, everyone says that is what happens. She figured she would go with the flow, let her body do the work as it goes through it. By the 3rd day she woke like nothing had happened, bright eyed and bushy tailed on 05Mar2021.  She reported with the booster shot the adverse events she experienced was equivalent like going through a bad chemo treatment; further described: At first started with aches and pains; said ok, this is like what it was before; then during the night she started to have a fever and by that time she was really zonked out; thought don't think it's a high fever, just tried to go back to sleep; woke up shaking and shivering, she had to put a wool blanket on over her down blanket and sheet. By morning the shakes and the fever had gone. Then she was just utterly fatigued; it felt like chemo because this is what she sometimes went through a couple of days after the chemo just before you go into the down cycle. She couldn't believe it, because one thing she never gets is nauseated; but she got nauseated with this and had a headache.She was out of it, fogged out, brain fog, like a really a cloudy sensorium. A friend of hers came to check on her to see if she was ok and patient didn't even know what day it was, she was just fogged out. It was really kind of dangerous for her to be alone. If she had known she would experience this kind of wipe-out she would have made sure a friend or nephew stayed with her or checked in to see that she was ok. Today she is pretty well back to normal, of course she is weak so she has to be careful walking around going up and down stairs stuff like that; but she is able to function.Regarding her concomitant products she mentioned she was so out of it after the booster shot that she didn't take her pills at night which included warfarin-Not particularly good thing-made it up next 2 days with increased dose of warfarin.   Follow-Up (08Sep2021): Follow-up attempts are completed. No further information is expected  No follow-up attempts are possible. No further information is expected.