sleeping more than usual; vomiting; diarrhea; flu-like symptoms; SOB; body aches; abdominal pain; UTI; fever; difficulty swallowing continues with nausea; difficulty swallowing continues with nausea; Entire vial of 6 doses, Received 0.3 ml of 0.45 ml undiluted vaccine (4 doses); Chest heaviness; This is a spontaneous report from a Pfizer sponsored program. A contactable Pharmacist reported for a female patient that a 33-years-old female patient received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: solution for injection, lot number: 30130BA, Expiry date: Unknown) via intramuscular, administered in left arm on 23Sep2021 as dose 2, single for COVID-19 immunization. Patient had earlier received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: solution for injection, lot number: FC3184, Expiry date: Unknown) via intramuscular, administered in left arm on 02Sep2021 as dose 1, single for COVID-19 immunization. The patient medical history and concomitant medications were not reported. Patient's medication history includes penicillin, hives. Patient did not receive any recent vaccines for SARS-CoV2 other than Pfizer-BioNTech COVID-19 Vaccine prior to the event being reported nor around the time of Pfizer-BioNTech COVID-19 Vaccine vaccination. Pharmacist reported from a hospital pharmacy that provides vaccine clinics off site. Pharmacist states a female patient, age unknown, received an entire vial of 6 doses today (reported as Entire vial of 6 doses, received 0.3 ml of 0.45 ml undiluted vaccine (4 doses) on 23Sep2021) and chest heaviness reported approximately 2 hours after dose. The error was identified after the patient had left the clinic and when staff identified the error they contacted the patient and she came back to the clinic for monitoring. The patient did stay for monitoring for one hour per report provided. The patient reported no problems other than chest heaviness and had taken 2 Tylenol and symptoms had resolved. The reporter reports no other symptoms. This was the patients 2nd dose of the vaccine and reporter stated they know that the 2nd dose may cause more flu like side effects so they were calling MI today to see if they could learn more regarding the possible side effects this patient may endure after receiving more than the recommended dose of the vaccine. On 24Sep2021 the patient was sleeping more than usual, vomiting, diarrhoea, flu-like symptoms, SOB (Shortness of breath), body aches, abdominal pain, UTI (Urinary tract infection), fever or difficulty swallowing continues with nausea. Patient was taken to emergency room and diagnosed with UTI and treated for same, patient's Cardiac enzymes (Myocardial necrosis marker) was unremarkable, and EKG(Electrocardiogram) shows no ischemia and was discharged on 24Sep2021. Patient was not hospitalized, and patient was not admitted to an Intensive Care Unit.  On follow up phone call with clinic patient was advised to increase fluid intake and Claritin daily. Patient was treated for the adverse events (Chest heaviness,diarrhea,flu-like symptoms,SOB,body aches,abdominal pain,UTI,fever). Therapeutic measures were taken as a result of chest heaviness which include 2 doses of Tylenol. The outcome of event Chest heaviness was recovered on an unspecified date of 2021 and outcome for events entire vial of 6 doses, received 0.3 ml of 0.45 ml undiluted vaccine, sleeping more than usual, vomiting, diarrhoea, flu-like symptoms, SOB, body aches, abdominal pain, UTI, fever and other events was unknown. The reporter dose not consider the Pfizer product had a causal effect to the adverse.  No follow up attempts are needed. No further information is expected.