How Much is Metformin at Costco Without Insurance?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
The cash price of metformin at Costco varies by location, strength, formulation, quantity, dosing schedule, and date. Costco's prescription discount program may reduce the price. Check with your local Costco pharmacy for current pricing before filling the prescription. Costco may offer a competitive cash price, but comparing current prices at local pharmacies and legitimate prescription-discount services can help identify the lowest option. A Costco membership generally is not required to use the pharmacy, but membership may be required for Costco's prescription discount program. Ask the pharmacy which price and eligibility rules apply.
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