PTCB Pharmacy Calculations Flashcards
7 cards from real Pharmacy practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 PTCB Pharmacy Calculations flashcards as text
A prescription for Metformin 500 mg reads '#60, 1 tab BID.' What is the days supply?
Answer: 30 days
60 tablets ÷ 2 tablets/day (BID) = 30 days supply.
A child weighs 22 lbs. The recommended dose is 10 mg/kg/day divided BID. What is each individual dose?
Answer: 50 mg
22 lbs ÷ 2.2 = 10 kg; 10 mg/kg × 10 kg = 100 mg/day ÷ 2 = 50 mg per dose.
A TPN bag contains 500 mL of dextrose 50% (D50W). How many grams of dextrose are in the bag?
Answer: 250 g
50% w/v = 50 g per 100 mL; 50 g/100 mL × 500 mL = 250 g of dextrose.
If 1 teaspoon equals 5 mL, how many teaspoons are in a 150 mL bottle?
Answer: 30 tsp
150 mL ÷ 5 mL/tsp = 30 teaspoons.
A powder for reconstitution has a powder volume of 10 mL. Adding 90 mL of water gives a final concentration of 250 mg/5 mL. What is the total volume after reconstitution?
Answer: 100 mL
Total volume = diluent volume + powder volume = 90 mL + 10 mL = 100 mL.
A 1 in 4 dilution is needed; the final volume required is 200 mL. How much concentrate is needed?
Answer: 50 mL
A 1:4 dilution means 1 part concentrate in 4 total parts; 1/4 × 200 mL = 50 mL of concentrate.
Convert 0.5 g to milligrams.
Answer: 500 mg
There are 1,000 mg in 1 g; 0.5 g × 1,000 = 500 mg.