# If you're a T1D taking Metformin when do you take it? Changing dose timing had a huge impact for me

**URL:** <https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600>\
**Category:** Metformin\
**Tags:** type-1\
**Created:** [April 12, 2022, 12:53am UTC](https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600 "2022-04-12T00:53:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bwschulz](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/bwschulz/32/8869_2.png) [@bwschulz](https://forum.fudiabetes.org/u/bwschulz)\
**Post date:** [April 12, 2022, 12:53am UTC](https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600/1 "2022-04-12T00:53:56Z")

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I’m a T1d that’s been on Metformin (500mg, 2x/day) for a long time. I had always taken it when I wake up and with dinner. But until recently I often had an inexplicable spike in blood sugar between 3 and 6AM. Sometimes nothing, other times as much as 100 mg/dL. It was maddening because I couldn’t figure out what was causing it- it seemed completely random as far as I could tell. I mentioned this to my PCP at my last physical and he commented that I should try taking my Metformin dose at bedtime (~11PM) instead of with dinner (5-7PM). Oh. My. God. That was it. I haven’t had my 3AM spike since making the change, and the one or two nights I forgot to take the Metformin had bad 3AM spikes. My best guess is that the bigger spikes occurred when I had an earlier dinner (and Metformin) and I never made the connection. So if you have a similar early morning blood sugar spike you might want to consider trying Metformin at bed time.

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**Author:** ![Sam](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/sam/32/10595_2.png) [@Sam](https://forum.fudiabetes.org/u/Sam)\
**Post date:** [April 12, 2022, 9:43pm UTC](https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600/2 "2022-04-12T21:43:38Z")

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Is that with metformin XR or regular?

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**Author:** ![bwschulz](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/bwschulz/32/8869_2.png) [@bwschulz](https://forum.fudiabetes.org/u/bwschulz)\
**Post date:** [April 13, 2022, 12:30am UTC](https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600/3 "2022-04-13T00:30:10Z")

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Just regular.

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**Author:** ![CarlosLuis](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/carlosluis/32/11389_2.png) [@CarlosLuis](https://forum.fudiabetes.org/u/CarlosLuis)\
**Post date:** [April 16, 2022, 1:40pm UTC](https://forum.fudiabetes.org/t/if-youre-a-t1d-taking-metformin-when-do-you-take-it-changing-dose-timing-had-a-huge-impact-for-me/12600/4 "2022-04-16T13:40:28Z")

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@bwschulz Type 2 on a pump and on Metformin here, it’s early to tell, but I have moved my evening dose to close to bedtime. That one change seems to have decreased both dawn phenomenon and Feet on the Floor syndrome.

I hope it continues to work over time. One thing I’ve learned overt the past 32 years that managing blood glucose levels is a dynamic thing. What works today might work tomorrow or not. And my heart goes out to women who have their cycles causing BG issues, maybe up, maybe down.