How much does metformin cost in 2026?

Generic metformin remains one of the least expensive prescription medications in 2026 — typically $4 to $15 per month at major U.S. pharmacies with a valid prescription, and often under $10 per month at GoodRx-style discount pricing. Physician-supervised programs that bundle the medication with an ongoing prescriber, refills, and clinical follow-up usually price the total between $25 and $75 per month.

Generic metformin retail price

Metformin has been generic for decades, so the medication itself is inexpensive. At most U.S. pharmacies in 2026, a 30-day supply of generic metformin 500 mg or 1000 mg immediate-release runs $4 to $15 out of pocket with a prescription — often under $10 with a pharmacy discount card. Extended-release (metformin ER) is slightly more expensive but still typically under $25 per month.

The bigger cost question is not the pill — it's whether you have a physician who can actually prescribe it and follow up with you appropriately.

Physician-supervised metformin programs

Programs that include a prescribing physician, ongoing dose management, and follow-up typically price a metformin protocol in the $25 to $75 per month range. That covers the intake, the prescription, refills, and access to your care team — not just the medication cost.

Metformin is often prescribed off-label for longevity, metabolic health, or as a companion to GLP-1 protocols. In those contexts it is used at conservative, individualized doses under physician supervision, which is why the program price sits above the raw generic cost.

What affects your monthly cost

The main drivers are: the formulation (immediate-release is cheapest, extended-release is slightly higher), the dose (500 mg vs 2000 mg per day changes how quickly you go through a bottle), whether you use insurance or a discount card, and whether physician review, refills, and follow-up are bundled into the program price.

If a program quotes a very low medication price and then adds a separate visit fee, refill fee, or shipping fee, add those in before comparing. A single flat monthly price with everything included is usually the most predictable way to budget it.

Medically reviewed by Dr. Michael Mimlitz, MD (NPI 1508891870), Chief Physician of GOAL.MD. Physician-supervised telehealth. More at goal.md/answers.