Calculating Days Supply

The days supply calculation is one you will be making for each and every prescription you fill as a pharmacy technician.

In most cases, “Days Supply” is calculated by dividing the maximum amount of the medication used in 1 day by the dispensed amount.

“Days Supply” means just what it sounds like: it is how many days the supply of dispensed medication will last.

Here are a couple of examples:

Example #1

Motrin (ibuprofen) 800mg, 1 tablet 3 times daily as needed, #30.

Days supply takes the maximum amount the patient could take in 1 day, in this case 3 tablets, divided into the amount dispensed of 30 pills-

30/3=10 days supply.

Example #2

Toradol (ketorolac) 10mg, 1 tablet every 4-6 hours as needed, not more than 4 per day. #80.

Quantity of pills: 80 divided by 4 (maximum amount per day) = 20 days supply.

Example #3

Celexa (citalopram) 40mg, 1 tablet daily, #30.

30/1=30 days supply.

These previous examples seem straightforward, but it gets a bit more complicated when you are dealing with other types of prescriptions.

Calculating Ear Drop and Eye Drop Days Supply are different than the example problems above.

Usually with ear and eye drops, 1ml (1 milliliter) will have 15 drops of medication.

Time for another example.

Example #4

Tobramycin Eye Suspension, 1 drop into each eye 3 times daily, 5ml bottle.

1 drop into each eye=2 drops X 3 times daily = 6 drops per day.

5ml X 15 drops per mL = 75 drops total.

75 drops / 6 drops per day = 12.5

Note: In this case the days supply is not a round number. Most pharmacy computer systems are unable to take a decimal number like 12.5. In this case you should round the number down to the nearest round number. So the answer to this example would be 12 days supply.

Topicals: Creams, and Ointments, Gels, 

These dosage forms require the pharmacy tech to calculate days supply using Fingertip Units. One fingertip unit = quantity of topical ointment/cream that when squeezed from a tube, reaches from the tip of an adult finger to the distal, or first crease of the index finger. One FTU is approximately 0.5g of the product.

Liquids: Solutions, Suspensions, Syrups

Example #5

Robutussin AC Syrup:

Take 1 Teaspoonful Every 6 Hours As Needed for Cough, 4oz.

In this example, you need to be able to convert Ounces (the American Standard System of Measurement) to Milliliters (the Metric System of Measurement.)

There are 30 ML in 1 Oz., so 4 Oz = 120 ML. There are 5ML’s in 1 Teaspoonful.

The maximum the patient could take in one day is 5ML times 4 (24 hours in 1 day, divided by 6 = 4) = 20ml used in one day. 120ML divided by 20ML = 6 Days Supply

Hopefully these examples have helped you to understand how to calculate days supply.

Days Supply Questions Answered

Have you got a Days Supply question that you just can't figure out? Submit your question below and/or scroll down for all questions and answers.

What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

Days Supply Question - #60 pills: Take 2 & 1/2 tablets daily 
If I had 60 pills on my rx, and I take 2 and 1/2 tablets daily, how long will the prescription last me (day supply)?

Take 1 tablet by mouth every 4 hours as needed for pain not to exceed 6 per day 
How many tablets should I be prescribed for a 30-days supply? For Hydrocodone/ Acetaminophen 10mg-325mg? If I was prescribed a smaller amount is the physician …

How To Figure Out The Days Supply On A TAPER 
David, could you please help me with this TAPER? How do you figure out the Days Supply on it? Maybe I'm making it more complicated than it is, but I don't …

Days Supply Math Question: How Many Additional Tablets Are Needed?  
10 days supply: dosage 2 tablets 3x per day. 16 tablets per bottle. How many additional tablets are needed?

90 Capsules: 1 cap twice daily for 1 week then increase 
90 Capsules: 1 cap twice daily for 1 week then increase to 3 capsules twice daily. What is the day supply? How do you figure it out?

Pharmacy Math Question: How many full bottles (10 pills/bottle) and additional tablets needed to fill this prescription? 
How many full bottles and additional tablets needed? If days supply needed is 45 and dosage = 1 tab daily, and there are 10 tablets per bottle. …

Coumadin 5mg 90 day supply 
Take two Coumadin 5mg every other day for 90 days. What is the quantity for 90 day supply?

90 xanax a month, 3 a day. When is the earliest I can pick them up? With last month having 31 days 
I get #90 Xanax (generic: alprazolam) a month, with dosing 3 times daily. Last month had 31 days in it. When is the next time I can pick up my refill? …

Pravachol 40mg-How many doses are a 90-Day Supply? 
Mr. Bob Day receives Pravachol 40 mg po daily to lower his cholesterol levels. How many doses would be dispensed for a 90 day supply?

50 pills: 1 pill by mouth every 6 hours prn. What is days supply? 
50 pills, 1 pill by mouth every 6 hours as needed. How many days will this last?

Days Supply Question on Norco 10mg/325mg: Take Every 8 Hours 
Take every 8 hours. How many days supply is that?

Days Supply Question: Norco 7.5 - Take 1-2 tablets Every 4-6 Hours #40 
Written As: Take 1-2 tabs every 4-6 hours, #40. How many days will this prescription last?

Days Supply Question: 1-2 Capsules every 6-8 hours, #90 
#90. Capsules = 1-2 po every 6-8 hours?

Days Supply Question: Klonipin (clonazepam) Take 2-3 pills Daily, #68? 
Take 2 to 3 pills daily, # of pills given is 68. What is the days supply?

Victoza Days Supply Question 
I had a patient today with a script for victoza 3pak ; 3mg sq daily! I have the worst time figuring I out victoza! It doesn't have to be this particular …

Days Supply Question on Testosterone Cypionate Injection-0.5ml every 2 weeks?  
How would you calculate the day supply for 1/2 ml every two weeks?

What is the day supply of Ferrous Sulfate 75mg/ml drops? 
Take 1.5 ml (22.5mg) by mouth every 12 hours, quantity 50 ml. What is the days supply?

Days Supply Question - Celebrex 200mg, #25 i po qd 
How do I calculate the number of days supply?

Days Supply Question for Liquid Medicine: 120ml, 10ml every 8 hours? 
4 ounces = 120ml: Take/Give 10ml every 8 hours. How many days supply is that?

How do you figure the days supply for a liquid (syrup) medication? 
120ML: 10ml every 8 hours-How many days supply is that?

Day Supply Question: 3/4 tablet every 6 hours-#35 
3/4 of a tablet every 6 hours with #35 quantity is how many days worth?

Diphenhydramine Liquid Days Supply Question 
You have received a prescription for diphenhydramine 12.5 mg/5 ml, dispense 240 ml. The patient is to take 50 mg po tid. What is the day's supply for this …

Click here to write your own.

Cough Syrup: 240ml, Take 10 ml every 4 hours-What is Days Supply? 
If your cough syrup has 240 ml and you take 10ml at a rate of every 4 hours, how soon will it run out? and/or how long would it be until when you are able …

Days Supply Question with Coumadin (warfarin) half-tabs and whole tabs  
Coumadin: Take one-half tablet on sun, mon, thur, fri, and sat., then take 1 tab tues and wed. Quantity is 90 tabs/ so what would be your days' supply? …

What is the Days Supply for "1 TSP PO BID", 240ML? 
Give 1 tsp PO bid Disp: 240ml What is the days’ supply of this suspension?

Days Supply Question: Do we always round down when after figuring the Days Supply, the answer includes a fraction? 
When the days supply is calculated and the answer is a fraction do I always round down? Example SIG: Take 1-2 tabs by mouth every 4-6 hours as needed …

Days Supply on 1/2 Tablet Three Times Weekly, #20? 
How do you find a day supply of a prescription of 1/2 tablet 3 times a week (Monday, Wednesday, and Friday) with a quantity of 20?

Liquid Motrin/Ibuprofen Days Supply/Dosing Question 
Take 1/4 oz of Motrin 4 times a day for 5 days. There are 6oz in the stock bottle. How many doses are in the bottle?

Other Ways to Calculate Days Supply And Quantity???? 
I have a test tomorrow for a data entry tech but I'm getting confused with it because everyone asks how I got my answer or why I did my calculations this …

Days Supply Question when Insurance has a 21 day dispensing limitation 
Sig on prescription: take 1 tablet 3 times a day. how do I calculate the maximum quantity allowed if the 3rd party plan has a 21 day dispensing limitation …

Liquid Days Supply Question: Can You Solve This? 
The directions on a prescription read " 1 tbsp QID, ac and hs." The quantity to be dispensed for a 30 day supply is...

Day Supply Question: When figuring Days Supply, does the calculation include the day it is filled? Not rated yet
Does the day supply calculation include the first day a prescription is filled?

Days Supply on Byetta and Symlin (Injectables): Is it always a 30 Days Supply? Not rated yet
what is the day supply on Byetta and Symlin the injectables for diabetes is it always 30 days supply

Click here to write your own.

Top of Days Supply

Premium PharmTech Package

Plus... 10 FREE Gifts!! Read on...

Exclusively from 
Pharmacy-Tech-Resources.com ONLY

So, you've found this page and you're wondering "What is the Premium PharmTech Package and Why Am I Going to Invest in it?"

Clearly you need to know how this Premium Collection of e-Books and e-Reports has the potential to impact your life, improve your career, your job satisfaction, your workplace relationships, and maybe even your income. Can an collection of digital downloads do that? Read on...

This Fantastic Collection of 20 e-Books and e-Reports (10 plus 10 FREE) is Hand-picked just for you.  You see, I'm pretty sure I know something about you...

  • Have you made your share of mistakes? (Don't worry, we're all human. Everyone of us has.  Coping with Pharmacy Errors, an e-Book resource I wrote that even I turn back to now and then; is included in this package.
  • are you tired of the head honcho pharmacist getting in your face and micromanaging every little detail of your job?  (Enter My Best Practices for the Assertive PharmTech  e-Book, with proven techniques to help you manage your workplace relationships, included.)
  • are you confused and lost when it comes to the minutia of how to override every last insurance rejection?  (Theres an easier way. Enter Resolving Insurance Rejections (now with Every DUR Code) a quite Handy e-Book, included.

What would you pay to learn...

  • The exact steps to follow to stack the deck in your favor in order to get yourself a raise.  (See Keys to PharmTech Career Success e-Book, included.

Imagine, just for a moment, what work would look like for you, after you invest in yourself and get this VALUABLE, JAM-PACKED e-Book Package... and apply what you've learned...

  1. You now recover and learn from your mistakes faster.
  2. You are now more assertive and know how to better handle coworker and customer relationships.
  3. You understand how to quickly resolve more Insurance Rejections 
  4. Maybe you've even earned a well-deserved raise! (Congrats!)

These examples are just the "tip of the iceberg" on all the stellar content you will soon be reading and applying.  

While you're sitting there reading this page, you begin to understand why you can't afford to waste any more time getting less than everything you deserve in your pharmacy tech career.

As you think about what you need in your career, you begin to realize that you have only one choice to make, and that is to invest in yourself and grab this Premium PharmTech Package.

Scroll down to see all of the resources (PDF digital downloads) included in this UNBELIEVABLE Deal...

This PREMIUM Collection of PharmTech Resources Might Just Transform YOUR Career! 

Plus... ALL the FREE EXTRAS below:

Plus more content so new, we don't even have the covers made yet!


ALL E-Resources below are
included in this Package:


Volume #1:
Coping With Pharmacy Errors
(USA) PharmTech Certification Demystified
Pharmacy Technician Settings
Latin Medical Abbreviations
Resolving Prescription Insurance Rejections
(now updated with EVERY(?) DUR Code)

Volume #2
HIPPA and The PharmTech
How to Become a Pharmacist/Roadmap to RPH
Pharmacy Systems of Measurement
Best Practices for the Assertive PharmTech
Keys to PharmTech Career Success


BONUS FREE GIFTS - Reports & E-Books:

Unofficial PTCB Exam #1: Questions & Answers
NEW: Unofficial PTCB Exam #2 (MATH): Questions & Answers
NEW Report: How To Cope With A Hostile Workplace
NEW Report: Managing Overwhelm At The Pharmacy
REPORT: Telephone Etiquette for PharmTechs
NEW: Pharmacy Dosage Forms
NEW: PharmTech Fundamentals & More
NEW: Time Management For PharmTechs
NEW: The Canadian PharmTech's Quick Start Guide
NEW Report:Pharmacy Root Cause Analysis
NEW Report: Improving Pharmacy Safety Culture
NEW: Cough & Cold Remedies AND Decongestants Mini-Guide

GRAB this valuable, Premium Collection NOW!
(Your competition may already have snatched it!) 

**NOW 50% OFF**
Normally $9.99, but now
 Half-Priced at $4.99

FOR A LIMITED TIME ONLY

Pay via Paypal for IMMEDIATE Download :)

Click Buy Now to get YOUR COPY of this
Premium PharmTech Package, before this deal is gone!

Add to Cart View Cart
Buy Now

Premium PharmTech Package

Powerful and Invaluable Knowledge from an

Experienced Pharmacy Insider is YOURS


Take Months off your Learning Curve and

Let me be Your Mentor,

revealing:

step-by-step,

with easy-to-follow,

essential how-to guides

that you will download IMMEDIATELY!!


You are clicking on the "Buy It Now" button 

and Checking Out Now (before this OFFER goes AWAY)

Add to Cart
Discount Code:

Didn't find what you were looking for? Use the box below to search this entire site.

Custom Search

Back to Home

New! Comments

Have your say about what you just read! Leave me a comment in the box below.
[?]Subscribe To This Site
  • XML RSS
  • follow us in feedly
  • Add to My Yahoo!


Didn't find what you were looking for? Use the box below to search this entire site.

Custom Search


Recent Articles

  1. IV Infusion Calculations Explained

    Oct 21, 17 10:13 PM

    This page explains IV Infusion Calculations you may use in your job as a Pharmacy Technician.

    Read More

  2. Improving Pharmacy Safety Culture

    Oct 16, 17 10:29 PM

    This page discusses ways of Improving Pharmacy Safety Culture - Focusing on Work Environment, Processes and Procedures, not Personnel

    Read More

  3. Pharmacy Root Cause Analysis

    Oct 16, 17 09:55 PM

    Pharmacy Root Cause Analysis (RCA) - What is an RCA? How can it help PharmTechs and Save Lives?

    Read More

  4. How much dextrose is in D10W in a 250 bag?

    Oct 15, 17 04:54 PM

    In D10W, how much dextrose is in a 250mL bag?

    Read More

  5. WHAT IS 2/3 OF A 45 DAY SUPPLY?

    Oct 15, 17 04:29 PM

    WHAT IS 2/3 OF A 45 DAY SUPPLY?

    Read More

  6. Is the HIPPA law broken when my pharmacist shares what drug class my RX is in while I pick the RX with my friend?

    Oct 01, 17 10:24 PM

    I was at the counter yesterday with a co-worker picking up my prescription. The pharmacist did not like the way I signed my name on the machine. He stated

    Read More

  7. Days Supply Question - #60 pills: Take 2 & 1/2 tablets daily

    Oct 01, 17 10:09 PM

    If I had 60 pills on my rx, and I take 2 and 1/2 tablets daily, how long will the prescription last me (day supply)?

    Read More

  8. Pharmacy Math Question: How many full bottles (10 pills/bottle) and additional tablets needed to fill this prescription?

    Oct 01, 17 09:47 PM

    How many full bottles and additional tablets needed? If days supply needed is 45 and dosage = 1 tab daily, and there are 10 tablets per bottle.

    Read More

  9. Is it Against the HIPPA Law if you confirm that someone goes to your pharmacy, but not share what meds they are on?

    Sep 30, 17 10:42 PM

    Is it violating hippa to tell someone a patient goes to your pharmacy but that you can't release any information about him or her?

    Read More

  10. HIPPA Violation? Tech accessing pharmacy records of boyfriends ex and child

    Sep 30, 17 10:31 PM

    My ex (who I have a contentious relationship with) recently started dating a pharmacy tech. I have not used that particular local pharmacy in over a year,

    Read More

  11. Are Security Cameras with Audio Recording A HIPPA Violation at a Pharmacy?

    Sep 30, 17 10:17 PM

    Is it a Hipaa violation to have audio security cameras in the pharmacy?

    Read More

  12. Pharmacy Tech Intentionally Makes HIPPA Violations in RANT on Social Media

    Sep 30, 17 09:53 PM

    I have a fellow tech who went on Facebook in a rant and exposed this guy for having a STD, she exposed his name as well and was a customer at our pharmacy,

    Read More

  13. Days Supply Question on Rynex PE: 1/4 to 1/2 tsp po q4-6h prn cold symptoms

    Sep 27, 17 09:33 PM

    Rynex PE 1/4 to 1/2 tsp po q4-6h prn cold symptoms #6oz What is the day supply? What is the dispensed quantity?

    Read More

  14. How long must PA Pharmacies maintain their original prescriptions?

    Sep 16, 17 07:44 PM

    How long must a PA pharmacy retain an original prescription?

    Read More

  15. Days Supply Question - 480 ml solution: 15 ml by mouth every 6 hours as needed

    Sep 16, 17 04:53 PM

    What is the days supply in this question?

    Read More