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 #1Motrin (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 #3Celexa (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.
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.
Click below to see contributions from other visitors to this page...
90 Capsules: 1 cap twice daily for 1 week then increase
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Take every 8 hours. How many days supply is that?
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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?
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Take 2 to 3 pills daily, # of pills given is 68. What is the days supply?
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How would you calculate the day supply for 1/2 ml every two weeks?
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How do I calculate the number of days supply?
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4 ounces = 120ml: Take/Give 10ml every 8 hours. How many days supply is that?
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120ML: 10ml every 8 hours-How many days supply is that?
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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 …
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?
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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????
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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
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Aug 20, 17 11:17 PM
My pharmacy gave my prescription to another patient with the same last name. Isn't this a HIPPA violation?
Aug 20, 17 10:46 PM
I know someone who is a pharmacy tech. My 10yr.olds medication was called into the pharmacy she works at. Her daughter and my daughters have an on off
Aug 20, 17 10:31 PM
Does the day supply calculation include the first day a prescription is filled?
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