diagnosed with a stage 4 non alcoholic cirrhosis of the liver and they were just about they put patient on a transplant and now that all sudden is now the stage 2; diagnosed with a stage 4 non alcoholic cirrhosis of the liver and they were just about they put patient on a transplant and now that all sudden is now the stage 2; sugar started running lower and lower and lower/the second shot it went to the 50; This is a spontaneous report from a contactable consumer (Patient). A 52-year-old patient of an unspecified gender received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration, administered in Arm Left on 24Apr2021 (Lot Number: EW0161) at the age of 52-year-old, as dose 2, single for covid-19 immunisation. Medical history included diabetic, stage 4 non alcoholic cirrhosis of the liver. Historical Vaccine included first dose of bnt162b2 via an unspecified route of administration, administered in Arm Left on 03Apr2021 (Lot Number: ES8737) at the age of 52-year-old, for covid-19 immunisation and patient experienced blood glucose decreased. Concomitant medications included dapagliflozin propanediol monohydrate (FARXIGA) taken for an unspecified indication, start and stop date were not reported; semaglutide (OZEMPIC) taken for an unspecified indication, start and stop date were not reported. The patient reported the vaccine on April 3rd was patient's first one and April 24th was patient's second one. The patient have from a last 3 years patient became very brittle diabetic they have been trying all the medication on patient, prior to taking the first vaccine patient had been stable and was on to medication. After patient took the first shot, patient's sugar started running a little bit lower but not dangerous, after patient took the second shot on the 24th, starting on 26th, Monday is 26th patient's sugar started running lower and lower and lower. So by May 1st patient was off all the medications for diabetes (Further clarification unknown, suspect captured as Unspecified medication) and patient's sugar is running in hundreds like 99, 98 or 105 with the whole month, now unfortunately now patient is just back with the medication by end of May but obviously something in a vaccine there is something that helped patient with sugar because it's more then just patient's sugar. The patient was diagnosed with a stage 4 non alcoholic cirrhosis of the liver and they were just about they put patient on a transplant and now that all sudden is now the stage 2. The patient stated in 50's so patient had couple of medication and then it almost of May at least for 4 good weeks of May patient had no liver issues what so ever no liver symptoms and no sugar patient was having and no medication and patient's sugars were running normal 98,100. Before patient had the vaccine the sugars were very out control they were 200, and they had patient a medications maintaining like 150 all the time. So patient got the first shot it further gone down into the 110 which is where the warning and patient kept going okay taking medicine working better but then the second shot it went to the 50, so patient become which was fine it was wonderful thing but patient would like to know what was in that which maybe that can help diabetic saving more.  The outcome of event was unknown.  Information on Lot/Batch number was available. Additional information has been requested.