Biguanide
Metformin dosage guide: how much to take and when
Choosing the right dose of Metformin (Metformin) is the most important practical decision after starting therapy. Metformin is supplied as tablet, extended-release tablet in 500mg, 850mg, 1000mg, and the right dose for a given person depends on the indication, age, comorbidities and tolerance to the active ingredient Metformin.
Starting dose and titration
According to the prescribing information, most adults begin Metformin at the lowest available strength of 500mg, 850mg, 1000mg and titrate up only if symptom control is insufficient and tolerability is good. Higher doses are reserved for selected cases. Older adults, people with renal or hepatic impairment, and those taking interacting medications should usually start at the lowest dose.
When to adjust
Dose adjustment is guided by symptom response and side effect burden, not by arbitrary schedules. Metformin's principal effect is to suppress hepatic glucose production by inhibiting mitochondrial complex I, which raises the cellular AMP/ATP ratio and activates AMP-activated protein kinase. If side effects are limiting at a given dose, going down a step is usually preferred over stopping abruptly. If the response is incomplete after several weeks, a higher dose can be tried under medical supervision.
Frequently asked questions
What is the standard starting dose of Metformin? ▾
Most adults start Metformin at the lowest strength of 500mg, 850mg, 1000mg, with adjustment based on symptom response and tolerance. Older adults and those with reduced kidney or liver function generally start lower. The prescriber decides the exact starting dose for each person.
Can I take a higher dose of Metformin if it isn't working? ▾
Higher doses of Metformin should only be used after consulting the prescriber. Doubling on your own is unsafe, especially with active ingredients in the Biguanide class. The prescriber can confirm whether titration is appropriate or whether the medication needs to be changed.
Products containing Metformin
More on Metformin
- With alcoholMetformin and alcohol — is it safe to drink?
- With foodShould Metformin be taken with food?
- Side effectsMetformin side effects: common, rare and warning signs
- OnsetHow fast does Metformin start working?
- DurationHow long does Metformin last?
- Missed doseWhat to do if you miss a dose of Metformin
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.