1.Easy
Practice exercise (made-up values, not clinical guidance). A solution of epinephrine has a ratio strength of 1:1 000. How many milligrams m are in 0.5 mL?
1:1 0000.5 mL
m = mg
Pharmacy calculations worksheet with answers
2.Easy
Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 500 mL of 5% w/v solution? Find m.
5% w/v500 mL
m = g
3.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 3.2 mL of diluent. The prescribed dose is 750 000 units. What volume V do you draw up? Round to one decimal place.
3.2 mL → 1 000 000 units/mL750 000 units
V = mL
4.Medium
Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 125 mg. What volume V do you draw up? Round to one decimal place.
500 mg1.8 mL+0.2 mL125 mg
V = mL
5.Hard
Practice exercise (made-up values, not clinical guidance). You must prepare 100 mL of 6% 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%6%100 mL
V = mL
6.Hard
A vial holds 500 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 130 mg. Draw up the dose: what volume V do you give?
500 mg9.6 mL + 0.4 mL130 mg
V = mL
Answer key
- 1. m = 0.5 mg
- 2. m = 25 g
- 3. V = 0.8 mL
- 4. V = 0.5 mL
- 5. V = 80 mL
- 6. V = 2.6 mL
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