Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:5 000. How many milligrams m are in 250 mL?

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 2 mL of 2% w/v solution? Find m.

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). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. The prescribed dose is 400 mg. What volume V do you draw up? Round to one decimal place.

A vial holds 1000 mg of powder. You add 1.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 500 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 10% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.