she is diabetic and her blood sugar is dropping really low; her arm was a little sore; she feels really shaky; This is a spontaneous report from a contactable consumer. This female consumer (patient) reported for herself. A female patient of an unspecified age received bnt162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE Solution for injection Lot number was not reported) via an unspecified route of administration on 2021 as dose 1, single for COVID-19 immunisation; insulin degludec (TRESIBA Lot number was not reported) via an unspecified route of administration from an unspecified date to an unspecified date, at 80 Units for an unspecified indication. Medical history included diabetic from an unknown date and unknown if ongoing. Concomitant medications included insulin lispro (HUMALOG) twice daily taken for diabetes mellitus, start and stop date were not reported. On an unspecified date, the patient experienced that she was diabetic, and her blood sugar was dropping low, her arm was a little sore. She was supposed to get the 2nd dose Saturday and she can't get it for 3 weeks. She got the vaccination like 3 weeks ago and was supposed to go this past Saturday for the other one. Her granddaughter that lives with her had Covid and was only 10 years old. The only side effect she noticed from the vaccine she was diabetic, and her blood sugar was dropping low. She got up this morning and it was 187 and she went ahead and had a bowl of cereal for breakfast, and this had happened several times in the last 3 weeks. Stated that her blood sugar around 10:45-11:00 she notices she feels shaky all over and went to check and it was 67. Caller states this happened over the weekend and last week it went down to 50 and it's never been that low, states the lowest it ever was 70 before the vaccine. She called the pharmacy over the weekend and she said she not had anybody reporting that with blood sugars and queried if there are any studies with diabetics with it affecting blood sugar. She still takes her Humalog in the morning and at night she takes the Flex Pan Tresiba, takes 80 units of Tresiba at night and takes 60 units before breakfast, lunch and dinner of Humalog, blood sugar dropped so low that at lunch time she will not take the Humalog, that she just checked it and it was 67 and had eaten 2 packs of cheese and peanut butter crackers and had orange juice, yesterday it was 50 so she fast ate a spoon full of sugar and orange juice. She was still feeling a little shaky and was laying down since the cheese with peanut butter and the orange juice. She had to carry something in her purse if she leaves the house to eat or something to bring her sugar back up and was curious if this was happening to other people that are diabetic. She had the injection Saturday around 11am and by 6pm her arm was a little sore and the next day and that was it, she had no other symptoms or side effects. Her granddaughter went to school Monday, Tuesday and Wednesday night she had a fever and said she didn't feel good and that her head hurt bad and felt like she was going to throw up. States the paediatrician sent a prescription to the ER for her to have a Covid test and called her Friday and said she tested positive. She was eating well and lots of fluids and said she felt fine and was sleeping a lot, the 8-year-old sibling can't go back to school until 06Sep2021 and the one with Covid can go back 31Aug2021. States she still had a runny nose and sore throat. since she had been exposed to COVID, the pharmacist told her to come back another time for her second dose. Caller was wondering if it was 3 weeks between the two doses and if it was ok to receive the second dose outside of the 3 weeks and queried if there are any studies with diabetics with it affecting blood sugar. The patient underwent lab tests and procedures which included blood glucose dropped resulted as decreased on an unspecified date it was 187, on an unspecified date it was 67, on an unspecified date it went down to 50, on an unspecified date on lowest it ever was 70 before the vaccine. The clinical outcome of the events was not resolved.  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.