fever; aches; headache; dizziness; weakness; fatigue; having flu-like symptoms and not cold symptoms; sore arm; booster dose; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 18 year-old male patient received bnt162b2 (BNT162B2), administration date 13Dec2021 (Batch/Lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (dose 1, single), administration date: Mar2021, for COVID-19 immunization; Bnt162b2 (dose 2, single), administration date: Mar2021, for COVID-19 immunization. The following information was reported: IMMUNISATION (non-serious) with onset 13Dec2021, outcome "unknown", described as "booster dose"; PYREXIA (non-serious) with onset 15Dec2021, outcome "not recovered", described as "fever"; PAIN (non-serious) with onset 15Dec2021, outcome "not recovered", described as "aches"; HEADACHE (non-serious) with onset 15Dec2021, outcome "not recovered", described as "headache"; DIZZINESS (non-serious) with onset 15Dec2021, outcome "not recovered", described as "dizziness"; ASTHENIA (non-serious) with onset 15Dec2021, outcome "not recovered", described as "weakness"; FATIGUE (non-serious) with onset 15Dec2021, outcome "not recovered", described as "fatigue"; INFLUENZA LIKE ILLNESS (non-serious) with onset 15Dec2021, outcome "not recovered", described as "having flu-like symptoms and not cold symptoms"; PAIN IN EXTREMITY (non-serious) with onset 15Dec2021, outcome "recovered", described as "sore arm". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of pyrexia, pain, headache, dizziness, influenza like illness. Additional information: The patient was over 18 years of age. The patient received the primary series of the purple cap Pfizer Covid-19 vaccine back in Mar2021 and received the booster dose of the purple cap Pfizer Covid-19 21 days ago (did not provide exact date) and for the past 19 days has complaints of fever, aches, headache, dizziness, weakness, and fatigue that continue to persist. The patient was having flu-like symptoms and not cold symptoms. The patient took a home Covid-19 test on 02Jan2022 that was negative. The patient googled that side effects from the Pfizer Covid-19 vaccine were expected to last a few days and googled information on taking ibuprofen and Tylenol for complaints of fever and pain/body aches. The patient has been taking aspirin, Advil, and Tylenol for above complaints, but the medications were decreasing in effectiveness on how well they were working. The patient took Aspirin 600mg on afternoon of 02Jan2022 and took 3xAdvils 200 mg (600 mg total) on morning of 03Jan2022 to bring fever down and aches and pain. The patient has been taking 3xAdvils 200 mg each in the morning and in the evening has been taking 3xAdvils 200 mg each and Tylenol. The patient has contacted his HCP on 03Jan2022 via email but was pending a response from HCP. The patient was asking whether there was information about above symptoms after getting the booster dose of the purple cap Pfizer Covid-19 vaccine lasting 19 days. The patient stated as expected had a sore arm for a couple of days then that went away. Then felt like flu symptoms. Stated, had read that could happen and was expecting it to last for 2, 3, or 4 days. The patient stated that these symptoms started 19 days ago. The patient still has a fever, aches, headache, dizziness and takes Advil, Tylenol to bring down temperature, but it did not seem to be helping; seemed to be getting worse. The patient asked is there something else he could take or something else he could do. Asked whether Pfizer has heard of the symptoms lasting longer. Declines to complete safety report. Stated just wanted to know whether the patient was weird, or if this was common. Said was wondering if maybe should try aspirin or something else. Additional lot numbers: Not Provided; declined to complete report.  The lot number for bnt162b2 was not provided and will be requested during follow up.