Diabetes
Metformin cost with insurance.
Metformin costs $0–$10/month for most insured patients in 2026, with no prior authorization required and cash prices as low as $4/month — the most commonly prescribed first-line type 2 diabetes medication.
Sample data — not yet verifiedNo prior authTier 1Generic
$18
List price (1 month)
$6
Cash discount
$4
Mail order
Related medications
See how Metformin compares
FAQ
Metformin cost questions
Why is Metformin so expensive?
Metformin is a generic medication. List prices vary by pharmacy but are typically low. Cash discount cards and mail-order can drive prices below $10/month at most major chains.
Does insurance cover it?
Most major insurance plans cover Metformin as a Tier 1 drug. Coverage varies by plan — use the calculator above for a plan-specific estimate.
Is there a generic for Metformin?
Metformin is already generic — you're paying the lowest manufacturer price.
What if my insurance denies it?
If your prior authorization is denied, options include: appealing with your prescriber, switching to a similar covered drug in the same therapeutic class, or using the manufacturer's self-pay program. The calculator above shows all four payment paths.
Data sources
Source URLs for Metformin have not yet been verified. Estimates below are modeled from general public pricing patterns.
- • Manufacturer published pricing pages
- • NADAC National Average Drug Acquisition Cost
- • Carrier-published formulary tiers (where known)
- • Cost Plus Drugs / mail-order public pricing
- • FDA Orange Book (generic availability)