Pharmacy Day Supply Calculations

Amanda, a pharmacist, explains day supply calculations for various medication forms, including solid dosage forms, oral liquids, inhalers, nasal sprays, eye and ear drops, and injectables, with a focus on insulin. She provides examples and conversion calculations to determine the correct day supply for prescriptions.

What is the basic definition of day supply in pharmacy?

• The dosage strength of a medication

• The total number of tablets in a prescription

• The number of days a prescribed quantity of medication will last

• The number of refills allowed for a prescription

If a prescription is for 2 tablets per day for 30 days, how many tablets should be dispensed?

• 60 tablets

• 30 tablets

• 90 tablets

• 120 tablets

For a prescription of metformin 500 mg tablets, 1 bid for 30 days, how many tablets should be dispensed?

• 30 tablets

• 90 tablets

• 45 tablets

• 60 tablets

How many days will 21 capsules of amoxicillin 500 mg taken 1 tid last?

• 5 days

• 7 days

• 10 days

• 14 days

How much amoxicillin suspension should be dispensed for a prescription of 1 teaspoon bid for 10 days?

• 100 ml

• 150 ml

• 50 ml

• 75 ml

For a prescription of Robitussin AC cough syrup, 1 teaspoon every 4-6 hours as needed, how many milliliters are needed for a 4-day supply?

• 60 ml

• 90 ml

• 150 ml

• 120 ml

How many days will an albuterol inhaler with 200 metered doses last if used 1-2 puffs q6h prn?

• 30 days

• 20 days

• 25 days

• 15 days

For a Flonase nasal spray with 120 metered sprays, used 2 sprays qd into each nostril, what is the day supply?

• 15 days

• 20 days

• 30 days

• 25 days

How many milliliters are needed for a 7-day supply of prednisolone 1% ophthalmic suspension, 2 drops os tid?

• 1.5 ml

• 3.0 ml

• 2.1 ml

• 2.5 ml

What is the day supply for a prescription of Humalog QuickPen U100, 20 units sq tid ac, with 5 three-milliliter pens?

• 25 days

• 35 days

• 20 days

• 30 days