FAQ
Metformin cost questions
How much does metformin cost with insurance?
Most commercially insured patients pay $0–$10/month for metformin. As a Tier 1 generic on every plan's formulary, copays are minimal. Some plans even waive the copay entirely for first-line diabetes medications.
What is the cheapest pharmacy for metformin?
Walmart's $4 generic list covers metformin at $4 for a 30-day supply (immediate-release). Costplus Drug Company sells it at similar low prices. Extended-release metformin (Glucophage XR generic) is slightly more expensive but still under $20/month.
Is metformin available as a generic?
Metformin IS the generic name. Brand names like Glucophage are rarely prescribed today since the generic is so cheap. Extended-release versions (Glucophage XR) also have generic equivalents at low cost.
How does metformin compare to newer diabetes drugs?
Metformin remains the first-line treatment for type 2 diabetes per ADA guidelines. Newer drugs like Jardiance, Farxiga (SGLT2), Ozempic, and Trulicity (GLP-1) are typically added when metformin alone isn't sufficient. Costs for newer drugs are dramatically higher ($300–$1,000/month vs $4 for metformin).
Does Medicare cover metformin?
Yes — metformin is on every Medicare Part D plan's formulary at Tier 1 with minimal or zero copays. It's typically one of the cheapest medications a Medicare beneficiary will fill.
What are common metformin side effects?
Most common side effects are gastrointestinal (nausea, diarrhea, stomach upset), typically improving over the first few weeks. Extended-release forms cause fewer GI issues. Rare but serious: lactic acidosis (associated with kidney function decline). Discuss any concerns with your prescriber.
Can I get metformin without insurance?
Yes — at $4/month from Walmart's generic list, Costplus prices, or GoodRx-discounted retail, metformin is affordable without insurance for nearly anyone. It's one of the most accessible prescription medications in the US.
Why is metformin first-line for diabetes?
Metformin has decades of safety data, proven cardiovascular benefits, doesn't cause hypoglycemia or weight gain, and costs almost nothing. It's the only oral diabetes medication with longstanding evidence of reduced mortality, making it the universal starting point per major guidelines.