Metformin vs Metformin ER/XR - dosage
I asked my doc about switching from Metformin to Metformin ER and was totally confused by his answer.
I've been taking Metformin 850 2x/day
He insists that the Metformin 750 XR ONCE PER DAY is the closest equivalent dosage
Basically he's saying that the XR is TWICE as strong as the regular -- and NOT that it provides the same amount in a quicker release
He gave me a script for 500XR 2x/day, but I'm worried that's a HUGE decrease in Metformin from 850 regular 2x/day
The way I interpret this, I'll be getting 1000 units of metformin/day instead of 1700 -- he says I'll be INCREASING the level of metformin in my bloodstream at any given time............
Can anyone point me to anything that I can give him to refute this?
Or tell me he's right and I shouldn't worry?