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.
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.
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.
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
Robutussin AC Syrup:
Take 1 Teaspoonful Every 6 Hours As Needed for Cough, 4oz.
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.
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Days Supply Question on Lantus Insulin Vials
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Days Supply Question: Amoxicillin 500mg #42 - One cap po every 8 hours
What is the day supply for the following? Amoxicillin 500mg #42: i cap po q8h
Days Supply Question: Norco, #35 pills, 1 tablet every 4-6 hours
How many days should 35 Norco last me if I was given #35 at 1 every 4-6 hours?
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)?
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What is the days supply in this question?
Days Supply Question - Take One Tablet by Mouth Every 4 Hours As Needed for Pain Not To Exceed 6 Per Day
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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?
Oxycodone 5mg; #60; 2 tablets po q4-6h prn for pain. What is days supply?
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Days Supply Question - #20 pills, 1.5 tablets by mouth daily
If you have 20 pills and you take 1.5 a days what's the days supply
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Take two Coumadin 5mg every other day for 90 days. What is the quantity for 90 day supply?
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Pravachol 40mg-How many doses are a 90-Day Supply?
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Days Supply Question on Norco 10mg/325mg: Take Every 8 Hours
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?
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#90. Capsules = 1-2 po every 6-8 hours?
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Days Supply Question on Testosterone Cypionate Injection-0.5ml every 2 weeks?
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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?
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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
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Cough Syrup: 240ml, Take 10 ml every 4 hours-What is Days Supply?
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Days Supply Question with Coumadin (warfarin) half-tabs and whole tabs
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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?
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