1.Easy
Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 10 mL of 2% w/v solution? Find m.
2% w/v10 mL
m = mg
Pharmacy calculations worksheet with answers
2.Easy
Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 0.9% w/v solution? Find m.
0.9% w/v500 mL
m = g
3.Medium
A solution has a ratio strength of 1:1000. You need 0.34 mg. Draw up the volume in the 1 mL syringe: what volume V is that?
1:10000.34 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 400 000 units. What volume V do you draw up? Round to one decimal place.
18.2 mL → 250 000 units/mL400 000 units
V = mL
5.Hard
A vial holds 500 mg of powder. You add 1.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 200 mg. Draw up the dose: what volume V do you give?
500 mg1.5 mL + 0.5 mL200 mg
V = mL
6.Hard
A vial holds 2000 mg of powder. You add 3.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 700 mg. Draw up the dose: what volume V do you give?
2000 mg3.2 mL + 0.8 mL700 mg
V = mL
Answer key
- 1. m = 200 mg
- 2. m = 4.5 g
- 3. V = 0.34 mL
- 4. V = 1.6 mL
- 5. V = 0.8 mL
- 6. V = 1.4 mL
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