Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 250 mL of 10% w/v solution? Find m.

A solution is 2% w/v. You need 48 mg of the drug. Draw up the volume in the syringe: what volume V is that?

A solution has a ratio strength of 1:1000. You need 0.63 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

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.

A vial holds 2000 mg of powder. You add 1.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 1400 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 20% dextrose by mixing 50% and 10% dextrose. How many mL V of the 50% solution do you need? Round to the nearest whole mL.