Questions and Answers
How many days will the insulin supply last given a quantity of 10 ML with a dosage of 35 units daily?
How many days will a 10 ML ear/eye drop supply last if the dosage is 5 drops four times a day?
10 days
How many days can a patient use the inhaler with 200 actuations, taking 2 actuations every 12 hours?
50 days
For a liquid medication in a 4 OZ (120 ML) bottle used at a frequency of 1 teaspoon four times a day, how many days will it last?
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What is the estimated day supply for nystatin ointment applied four times a day?
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If a patient takes ii tablets every morning and ii tablets every night with a quantity of 60 tablets, how many days will the tablets last?
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Study Notes
Insulin Calculation
- 1 ML of insulin equals 100 units.
- Example: HUMULIN N U-100 with a sig of 35 units SQ daily.
- Quantity of insulin provided is 10 ML (or 1000 units).
- Calculation for days supply: 1000 units / 35 units per day results in 28 days.
Ear/Eye Drop Calculation
- 20 drops are equivalent to 1 ML.
- Example: SIG indicates 5 drops in each ear (AD) four times a day (QID) for 7 days.
- Quantity provided is 10 ML.
- Calculation for days supply: 10 ML x 20 drops/ML = 200 drops total; 200 drops / 20 drops (sig) gives 10 days.
Inhaler Actuation Calculation
- Inhalers can vary in the number of actuations.
- Example: ATROVENT contains 200 actuations with a sig to inhale twice every 12 hours (Q12H).
- Calculation for days supply: 200 actuations / 4 (2 actuations every 12 hours) equals 50 days.
Liquid Medication Calculation
- Liquid doses can vary.
- Example: A sig states 1 teaspoon (i TSP) four times a day (QID) as needed (PRN) for cough and cold.
- Quantity provided is 4 ounces (120 ML).
- Calculation involves: 5 doses daily (1 TSP = 5 ML) leading to 5 x 4 = 20 ML consumed daily; thus, 120 ML / 20 ML gives 6 days.
- Determine appropriate bottle size by dividing quantity by 30 (120 ML / 30 = 4 oz bottle).
Ointment/Cream Calculation
- Day supply for ointments/creams can vary based on application frequency and tube size.
- Example: NYSTATIN skin ointment at 100,000 units per gram with a sig to apply QID.
- Day supply is an estimate; commonly, ointments last around 30 days.
Tablets/Capsules Calculation
- Day supply can differ based on dosage regimen.
- Example: SIG indicates ii tablets orally in the morning (QAM) and ii tablets at night (QHS).
- Quantity provided is 60 tablets.
- Calculation for days supply: Patient takes a total of 4 tablets daily; therefore, 60 tablets / 4 tablets results in 15 days of supply.
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Description
This quiz focuses on essential pharmacy calculations related to medication dosing and supplies. It includes calculations involving insulin, ear/eye drops, and inhalers, providing practical examples for better understanding. Perfect for pharmacy students or professionals looking to enhance their calculation skills.
