Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:2 000 as a percentage strength p (% w/v).

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 3% 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. The prescribed dose is 600 mg. What volume V do you draw up? Round to one decimal place.

A solution has a ratio strength of 1:1000. You need 0.37 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). You have 150 g of 10% salicylic acid ointment. How many grams m of 2% salicylic acid ointment must you add to make a 5% ointment? Round to the nearest whole gram.

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 mL of 2% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.