Has anyone heard of brain fog or confusion after taking Metformin for diabetes?

Question About: Brain Fog


Has anyone heard of brain fog or confusion after taking Metformin? My mother was without her Metformin for two days and I am not sure if it was a coincidence or not, but it seemed as if she was a little less confused on those two days. She takes Razadyne and Namenda for her Alzheimer's.

Expert Answer by Theresa Garnero

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No patients I have worked with have reported experiencing "brain fog" or confusion as a result of taking Metformin. Usually, the main side effect is gas, bloating and diarrhea when first starting the medication.

That said, medications have many idiosynchratic (unexpected) reactions. It's hard to tell with your mother's Alzheimer's condition. Since you noted an improvement in her mentation when she was NOT taking Metformin, it's best to let her doctor know so other options may be considered.

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I was on Metformin for 2 years. I was slowly losing my ability to work. I was wondering what was happening to me. I am an engineer and I get paid to solve the big problems. I was on a one week trip that lasted a month. I ran out of Metformen and in 3 days I was back the normal. I stopped taking it and the FOG lifted. The same thing happened to my wife, the salad queen. She was in the kitchen the other day and she looked at me and said “I just can’t remember what goes in a salad”. She is now off Metformen and back to normal. I think there a lot of people out there on Metformen that are in a fog!

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I had that fog and confusion last winter when I took Metformin for about 2 mo. Having just recovered from Pancreatitis with somewhat similar problems I thought it was a reoccurence of that. Drs put me through all kinds of tests but none suspected Metformin. When I did stop within 2 days was able to do my taxes on line so easily. Before I could barely keep Drs appointments or pay bills and was worried I could no longer live alone. Dramatic and so scary.

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