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Costco Prescription Pricing
March 31st, 2026

How Much is Metformin at Costco Without Insurance?

Metformin at Costco typically costs $4-15 for a 90-day supply without insurance. Costco's Member Prescription Program offers metformin 500mg tablets for approximately $4.32 for 100 tablets, while 850mg costs around $8.94 for the same quantity. The exact price varies by dosage strength and quantity purchased. Costco consistently offers some of the lowest prices among major retailers for this diabetes medication. A Costco membership is required to access their pharmacy services and discounted prescription prices.

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