AL Pharm Tech

    Transdermal Patch

    Fentanyl Patch Day Supply Calculator

    Generic: fentanyl transdermal system · 12, 25, 50, 75, or 100 mcg/hr · Box of 5 patches

    Open free days supply calculator

    Worked example

    Apply 1 patch transdermally every 72 hours

    Dispensed
    10 patches
    Daily use
    1 patch per 3 days
    30
    days supply
    1. One patch lasts 72 hours, so each patch is 3 days
    2. 10 patches x 3 days = 30 day supply

    Alabama Days Supply Cheat Sheet

    One printable page with the days supply math Alabama pharmacies check at the bench and on every insurance claim.

    One-time download$1
    • Tablets, capsules, and tapers using the whole number rounding Alabama pharmacies expect
    • Insulin vials and pens, with units per package worked out for you
    • Inhalers, puffs, eye drops, and mL to drops conversions
    • The same math taught in the ALBOP approved technician training program from Dalton Pharmacy

    The days supply calculator stays free. Built by Tyler Dalton, PharmD.

    Meet your Alabama training requirement

    Days supply is the math you will use at the bench. Alabama Pharm Tech is ALBOP-approved training that walks you through this math step by step, plus everything else you need to finish on time.

    • ALBOP-approved training program
    • Start today, finish on your schedule
    • Pharmacy math practice with worked solutions
    • One payment of $199, everything included
    Enroll Now - $199

    Product details

    • Brand: Fentanyl Patch
    • Generic: fentanyl transdermal system
    • Strength: 12, 25, 50, 75, or 100 mcg/hr
    • Typical package: Box of 5 patches
    • Calculator tab: Use the topical section in our tool

    Pharmacy tech tips

    • Every 72 hours means each patch covers 3 days, so 10 patches is 30 days.
    • A few patients are prescribed every 48 hours, which makes 10 patches a 20 day supply.
    • This is a controlled substance, so the days supply must match the sig exactly for state reporting.

    Frequently asked questions

    How do you calculate day supply for a fentanyl patch?

    Multiply the number of patches by the number of days each patch is worn. Ten patches changed every 72 hours is a 30 day supply.

    What if the patch is changed every 48 hours?

    Each patch covers two days, so ten patches is a 20 day supply. Enter the interval from the sig, not the standard 72 hours.

    Related Transdermal Patch guides

    Nitroglycerin Patch day supplyLidocaine Patch day supply

    Run the numbers with a free calculator

    Same math, done for you. Enter the quantity and sig and get the day supply in seconds.