1.Easy
Practice exercise (made-up values, not clinical guidance). A solution of epinephrine has a ratio strength of 1:10 000. How many milligrams m are in 3 mL?
1:10 0003 mL
m = mg
Pharmacy calculations worksheet with answers
2.Easy
Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:5 000. How many milligrams m are in 250 mL?
1:5 000250 mL
m = mg
3.Medium
A solution has a ratio strength of 1:1000. You need 0.32 mg. Draw up the volume in the 1 mL syringe: what volume V is that?
1:10000.32 mg
V = mL
4.Medium
Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 8.2 mL of diluent. The prescribed dose is 600 000 units. What volume V do you draw up? Round to one decimal place.
8.2 mL → 500 000 units/mL600 000 units
V = mL
5.Hard
Practice exercise (made-up values, not clinical guidance). You must prepare 300 mL of 3% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.
30%0%3%300 mL
V = mL
6.Hard
Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 5% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.
23%3%5%200 mL
V = mL
Answer key
- 1. m = 0.3 mg
- 2. m = 50 mg
- 3. V = 0.32 mL
- 4. V = 1.2 mL
- 5. V = 270 mL
- 6. V = 20 mL
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