1.Easy
Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 5 mL of 1% w/v solution? Find m.
1% w/v5 mL
m = mg
Pharmacy calculations worksheet with answers
2.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 10 mL?
1:10 00010 mL
m = mg
3.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 200 mg. What volume V do you draw up? Round to one decimal place.
500 mg1.8 mL+0.2 mL200 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 18.2 mL of diluent. The prescribed dose is 1 500 000 units. What volume V do you draw up? Round to one decimal place.
18.2 mL → 250 000 units/mL1 500 000 units
V = mL
5.Hard
A vial holds 250 mg of powder. You add 3.8 mL of diluent, and the powder adds 0.2 mL of volume. The prescription is 100 mg. Draw up the dose: what volume V do you give?
250 mg3.8 mL + 0.2 mL100 mg
V = mL
6.Hard
A vial holds 2000 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 560 mg. Draw up the dose: what volume V do you give?
2000 mg9.6 mL + 0.4 mL560 mg
V = mL
Answer key
- 1. m = 50 mg
- 2. m = 1 mg
- 3. V = 0.8 mL
- 4. V = 6 mL
- 5. V = 1.6 mL
- 6. V = 2.8 mL
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