hello again in our previous videos we've mastered calculating doses quantities to dispense and ingredient amounts now we'll learn how to determine the day supply of a medication this is key to ensuring patients have enough medication for the prescribed duration the day supply is the number of days a prescribed quantity of medication will last if taken as directed to calculate this you need to know the dose the frequency and the total quantity dispensed the formula is is day supply equals total quantity dispensed divided dose time frequency let's dive into an example a provider writes a prescription with the following Sig code one tab poid dispense 60 tablets what is the day supply for this prescription to solve this follow these Steps step one interpret the Sig code one tab poid means one tablet by mouth twice daily step step two calculate the total daily dose total daily dose equals one tablet multip by two times per day equals two tablets per day step three calculate the day supply day supply equal total quantity dispens divided by total daily dose hence day supply equals 60 tablets divided by two tablets per day equals 30 days so the day supply is 30 days let's practice another problem together a provider writes a prescription with the following Sig code two sprays each nostril QD dispense 60 meter doses what is the day supply for this prescription step one interpret the Sig code two sprays each nostril QD means two sprays in each nostril every day step two calculate the total daily dose total daily dose equal two sprays time two nostrils equal four sprays per day step three calculate the day supply day supply equal total quantity dispens divided by total daily dose day supply equals 60 sprays divided four sprays per day which equals 15 days so the day supply is 15 days now it's your turn to try a problem on your own a prescription States one capsule tid dispense 60 capsules what is the day supply for this prescription pause the video solve the problem and then we'll check the answer together let's see how you did step one interpret the Sig code one capsule TI means one capsule 3 times daily step two calculate the total daily dose total daily dose equals one capsule time three times per day equals three capsules per day step three calculate the day supply day supply equals total quantity dispens divided by total daily dose day supply equals 60 capsules divided by three capsules per day which equals 20 days so the day supply is 20 days fantastic you've now learned how to calculate the day supply of a medication completing our dosage calculation series keep practicing these skills to ensure accuracy and safety in your Pharmacy practice