The answer is below, straight from the label. After that, if you want someone asking how your stomach is each day and reminding you to take it with food, that's me.
Morning dose
9 of 10 days
The metformin tablet label, revised July 2025, reports what people had in a placebo-controlled trial and what to do about it. Here it is in plain words.
Stop taking metformin and call your prescriber right away if you feel very weak and tired, have unusual muscle pain, trouble breathing, unusual sleepiness, unexplained stomach problems with nausea, vomiting, or diarrhea, feel cold especially in your arms and legs, feel dizzy or lightheaded, or have a slow or irregular heartbeat. Those are the label's signs of lactic acidosis, the reaction its boxed warning is about. The label says the onset is often subtle, with nothing more specific at first than feeling unwell, achy, or short of breath.
Out of every 100 people on metformin in the label's trial, compared with 100 on placebo:
Diarrhea was bad enough that 6 in 100 stopped taking it.
The Medication Guide says these effects "generally go away after you take the medicine for a while." It does not name a number of weeks, and nothing here should.
What the label does describe is the dose being raised in steps, 500 mg a week or 850 mg every two weeks, based on how your blood sugar responds and how well you tolerate it. If a step up brings the stomach trouble back, that is a thing your prescriber wants to hear about, because the pace is theirs to set.
In the label's 29-week trials, about 7 in 100 people had their vitamin B12 drop below normal. It reversed when metformin was stopped or B12 was supplemented. The label calls for a B12 check every two to three years and a blood count every year. If nobody has mentioned it, it is a fair question at the next visit.
The label's boxed warning is about lactic acidosis, and it lists who is more at risk: reduced kidney function, age 65 and over, a scan with contrast dye, surgery, a liver problem, and heavy drinking. Two practical things follow. Tell any office scheduling a scan or a procedure that you take metformin, because they may pause it. And ask your prescriber where they want you on alcohol.
I never change your dose, never tell you to skip one, and never diagnose. What I do is remind you at the meal, ask every day how your stomach is, keep the answers, and when your prescription printout is on file hold what you tell me against its stop-and-call list so a bad turn gets noticed on the day it happens.
No clinician reviewed this page. It restates the FDA label and MedlinePlus, linked below, and those are the documents to trust over anything here.
Breakfast and dinner, or however your prescription reads. I remind you when the meal happens and ask whether the dose did too.
dinner 💊 did the metformin go with it tonight?
Tell me once. I ask each day how it is and keep the answers, and if you've sent the prescription printout I hold what you say against its stop-and-call list.
week 2 check: stomach any calmer than last week?
Text me the morning number when you take it. I keep them with the dates, so before the follow-up you can ask what the month looked like and walk in with the record.
11 fasting readings since the 3rd. want the list?
Tap to start a conversation if this sounds like you.
Everything above works from what you tell me. Photo the pharmacy printout or the bottle and the meal reminders, the stop-and-call list, and the refill timing come from your own instructions instead of memory. Your prescriber owns the dose.
Hi, I'm Francis 👋
In the label's own trial, half the people on metformin got the stomach part, and almost nobody hears that at the pharmacy counter. I built this so someone asks how it's going on day three.
Francis John, BodyBuddy FounderText me7-day free trial, cancel anytime.
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