In the past nurses used to get their jollies by administering enemas if you were daft enough to go anywhere near a hospital but this practice was discontinued when it was discovered that it was killing people.
I think that dishing out Meformin has just replaced enemas and this possibly cheers up an otherwise dull day for your average HCP. I am still not convinced that they do anything.
However to your question. The only way to stop it is to tell your HCP that you are experiencing an undesirable side effect that you cannot put up with and get the dose reduced. This is what I did when they caused me taste displacement. Everything tasted of burnt plastic. You don't have to suffer the side effects needlessly.