When Can I Refill
My Prescription?
Enter your prescription details to instantly calculate your next eligible refill date and days remaining.
Prescription Refill Guide
Managing prescription refills is one of the most common frustrations in healthcare — running out of a critical medication because of a miscalculated refill date can be dangerous for maintenance medications like blood pressure drugs, diabetes medications, and thyroid treatments. The refill calculator above takes the guesswork out of tracking your eligibility date.
How Refill Windows Work
Most insurance plans and pharmacy benefit managers (PBMs) allow refills when 75–80% of the previous supply has been used — effectively 7–10 days before the prescription runs out on a 30-day supply. Some plans enforce stricter windows; controlled substances typically cannot be refilled early at all.
Mail Order vs Retail Pharmacy
Mail order pharmacies typically dispense 90-day supplies and often require ordering 2 weeks before the supply runs out to account for shipping time. The refill calculator’s 14-day early window option is designed for mail order users.
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