Was on that for a while shortly after diagnosis. For me there was a noticeable drop in sugar levels after a few days of starting them and had to lower insulin
doses. Then increase after weaning off them.
I was on Citalopram for a few months a couple of years ago, then Sertraline, and now Venlafaxine. I'm not sure any of them affected my blood glucose levels, but they were terrible anyway, partly because of the reasons for taking the SSRIs and SNRIs, so it wasn't really possible to tell.