Prescription Refill Calculator
Calculate next refill dates and medication days supply for prescriptions and over-the-counter medications
Prescription Refill Calculations
The date you received/started your current prescription
Number of days the medication should last
Example: 30-Day Prescription
Patient Scenario
Medication: Blood pressure medication
Fill date: January 1, 2024
Quantity: 30 tablets
Directions: Take 1 tablet once daily
Calculation Results
Days supply: 30 tablets ÷ (1 tablet × 1 time/day) = 30 days
Next refill date: January 1 + 30 days = January 31, 2024
Refill reminder: Contact pharmacy around January 28-29
Common Prescription Periods
Refill Management Tips
Set reminders 3-5 days before refill date
Check insurance coverage before refilling
Keep track of remaining refills on prescription
Use pharmacy apps for automatic refill reminders
Consider 90-day supplies for chronic medications
Never stop medications without consulting your doctor
Understanding Prescription Refills
Days Supply Calculation
Days supply determines how long your medication will last based on the prescribed dosing regimen. This calculation is essential for planning refills and ensuring continuous therapy.
Prescription vs. OTC Medications
- •Prescription (Rx): Requires doctor's authorization, stronger medications
- •Over-the-Counter (OTC): Available without prescription, generally milder
- •Both types can benefit from refill tracking and supply calculations
Calculation Formulas
For Tablets/Capsules:
Days Supply = Total Tablets ÷ (Tablets per Dose × Doses per Day)
For Liquids:
Days Supply = Total Volume ÷ (Dose Volume × Doses per Day)
Dose Volume = Dose (mg) ÷ Concentration (mg/ml)
Important: This calculator is for planning purposes only. Always follow your healthcare provider's instructions and consult your pharmacist for medication-specific questions.