Pharmaceutical Calculations and Compounding Flashcards
6 cards from real Pharm.D. Doctor of Pharmacy practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pharmaceutical Calculations and Compounding flashcards as text
A patient requires a 500 mg dose of amoxicillin. The available suspension is 250 mg/5 mL. How many mL should be dispensed per dose?
Answer: 10 mL
Using the formula: (500 mg ÷ 250 mg) × 5 mL = 10 mL per dose.
A prescription reads: acetaminophen 650 mg PO q6h PRN pain. What is the maximum daily dose?
Answer: 2,600 mg
Dosing q6h means 4 doses per day; 650 mg × 4 = 2,600 mg per day.
What does the Roman numeral 'XL' represent in a traditional prescription?
Answer: 40
In Roman numerals, XL represents 40 (50 minus 10), used in prescriptions to indicate quantity.
How many grams of NaCl are needed to prepare 500 mL of a 0.9% w/v NaCl solution?
Answer: 4.5 g
0.9% w/v = 0.9 g per 100 mL; for 500 mL: 0.9 × 5 = 4.5 g of NaCl.
A patient weighs 154 lbs. A drug is dosed at 5 mg/kg. What is the total dose in mg?
Answer: 350 mg
154 lbs ÷ 2.2 = 70 kg; 70 kg × 5 mg/kg = 350 mg.
An IV fluid is running at 125 mL/hr. How many hours will a 1-liter bag last?
Answer: 8 hours
1,000 mL ÷ 125 mL/hr = 8 hours for the 1-liter bag to infuse.