for 2 hours for the second dose of the Pfizer Covid-19 vaccine because her sister did not look well.; had complaints of chills and fluctuations in her blood pressure with the second dose.; had complaints of chills and fluctuations in her blood pressure with the second dose.; This is a spontaneous report received from a contactable reporter(s) (Other HCP) from medical information team for a Pfizer sponsored program.  A 74 year-old female patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 2, single for covid-19 immunisation. Relevant medical history included: "cutting the grass" (unspecified if ongoing), notes: being allergic to like bleach and cutting the grass; "she has a wide variety of allergies" (unspecified if ongoing), notes: she has a wide variety of allergies. There were no concomitant medications. Past drug history included: Bleach, reaction(s): "Allergy: Bleach", notes: being allergic to like bleach and cutting the grass. Vaccination history included: Bnt162b2 (Dose 1 of Pfizer Covid-19 vaccine.), for COVID-19 Immunization; Tetanus shot (history of having a reaction to the tetanus shot-complaints of chills and bedridden., states she had a tetanus shot that she had 3-4 day reaction), for Immunization, reaction(s): "Bedridden", "chills"; Flu shot (had a reaction to the flu shot last year 2020-complaints of chills and being sick), administration date: 2020, for immunization, reaction(s): "Chills"; Flu shot (had a reaction to the flu shot last year 2020-complaints of chills and being sick), administration date: 2020, for Immunization, reaction(s): "Being sick". The following information was reported: FEELING ABNORMAL (non-serious), outcome "unknown", described as "for 2 hours for the second dose of the Pfizer Covid-19 vaccine because her sister did not look well."; CHILLS (non-serious), BLOOD PRESSURE ABNORMAL (non-serious), outcome "unknown" and all described as "had complaints of chills and fluctuations in her blood pressure with the second dose.". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: HCP was calling on behalf of her female sister. HCP also reported that her niece got passed from Covid-19, but she wasn't vaccinated with any Covid-19 vaccine. Caller reports that her 74-year-old sister had both doses of the purple cap Pfizer Covid-19 vaccine (date unknown per HCP) and had complaints of chills and fluctuations in her blood pressure with the second dose. HCP reports that the vaccination site observed her for 40 minutes after the first dose and for 2 hours for the second dose of the Pfizer Covid-19 vaccine because her sister did not look well. HCP reports that her sister's HCP had told her to hold off on getting the purple cap Pfizer Covid-19 vaccine. HCP was asking if it was safe for her sister to get the purple cap Pfizer Covid-19 vaccine booster dose? The CDC states that So far, reactions reported after getting a booster shot were similar to those of the two-shot or single-dose primary series. Fever, headache, fatigue, and pain at the injection site were the most commonly reported side effects, and overall, most side effects were mild to moderate. However, as with the two-shot or single-dose primary series, serious side effects are rare, but may occur.  Follow-up attempts completed. No further information is expected.