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Storage Methods

The medication should be stored at room temperature, away from moisture or heat. The tablets should be kept in an airtight container.
Keep metformin and all medications out of the reach of children.

What Should I Do If I Miss a Dose?

If you do not take your metformin as scheduled, take your next dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose.


Metformin tablets are available in five strengths:
  • Metformin 500 mg 
  • Metformin 850 mg
  • Metformin 1000 mg.
Long-acting metformin ER (Glucophage XR) is available in two strengths:
  • Metformin ER 500 mg tablets.
  • Metformin ER 750 mg tablets.
Long-acting metformin 1000 mg tablets are also available and are sold under the brand names of Fortamet and Glumetza. A liquid version of metformin, called Riomet, is also available.

Generic Metformin

Both brand-name and generic Glucophage, Glucophage XR, and Fortamet are currently licensed for sale. However, generic versions of Glumetza and Riomet are not licensed for sale at this time.
(Click Generic Metformin for more information.) 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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