I thought I would update this thread to let people know that my splitting of metformin has been a huge success.
In the week or so since I’ve done it, my estimated A1c on Dexcom has gone from 6.6% to 6.1%. And, what’s more, the number of nights I’ve been able to sleep the entire night with no alarms (high or low) has gone up exponentially.
Before splitting metformin, my overnight pattern often looked like a mountain, with a gradual rise followed by a gradual fall. Since splitting metformin, it’s been a fairly consistent flatline.
The other thing I’ve changed is that I’ve started doing a 1.5 hour extended bolus to cover dinner. If I don’t do this, I’m prone to dropping low after dinner, then treating and going high, then correcting, and we all know what a mess that creates before bed. This allows me to bolus for dinner and be done with it, and oddly I don’t spike high (beyond my upper limit of 8 mmol/L or 145 mg/dl) at all for dinner even though I’m getting no insulin up front.