6 Days Supply Calculations Free Online FlashCards

What is the basic days supply formula?

Divide the quantity dispensed by the quantity used per day: $\text{Days supply}=\frac{\text{quantity dispensed}}{\text{quantity used per day}}$.

Why must units match in a days supply calculation?

Express the dispensed quantity and daily use in the same units before dividing, such as milliliters with milliliters or puffs with puffs.

How do you calculate daily tablet or capsule use?

Multiply the units per dose by doses per day to find daily use, then divide the dispensed units by that daily amount.

How long will 90 tablets last at 1½ tablets twice daily?

Daily use is $1.5\times2=3$ tablets. The supply lasts $90\div3=30$ days.

How should as-needed directions affect maximum daily use?

Use the maximum permitted daily use. For 1 tablet every 4 to 6 hours as needed, the maximum is 6 tablets per day.

How do you calculate liquid days supply when the dose is in milligrams?

Convert the dose to milliliters using the product concentration, then calculate milliliters used per day before dividing the dispensed volume.

What volume should be used for a reconstituted medicine?

Use the final volume after reconstitution. A shorter beyond-use or stability period may limit how long that volume can be used.

What quantity is used to calculate inhaler days supply?

Use the labeled number of usable actuations in that inhaler, not its weight or the number of containers.

How long will a 200-actuation inhaler last at 2 puffs every 6 hours as needed?

Maximum use is $4\times2=8$ puffs per day. The inhaler lasts $200\div8=25$ days.

What product details should be checked for an inhaler?

Check the product labeling for priming requirements, dose-counter instructions, and any device-specific discard directions; inhalers may differ.

How do you calculate days supply for creams and ointments?

Divide the dispensed grams by grams used daily. Find daily use by multiplying the amount per application by applications per day.

Can topical days supply be determined exactly if the amount per application is unspecified?

It cannot be determined exactly from tube size alone; the amount depends on the treated area and application directions. A rough estimate is that 1 g covers about four handprints.