Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). 125 g of dextrose is dissolved in water to a total volume of 250 mL. What is the percentage strength p (% w/v)?

A solution is 2% w/v. You need 38 mg of the drug. Draw up the volume in the syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). A vial contains oxacillin 2000 mg as a powder. The practice label says to add 11.5 mL of sterile water; the powder adds 1 mL to the volume. What is the concentration C in mg/mL after reconstitution?

Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. What is the concentration C in mg/mL after reconstitution?

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

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 450 mg. Draw up the dose: what volume V do you give?