Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many g of sodium bicarbonate are in 10 mL of 8.4% w/v solution? Find m.

A solution is 1% w/v. You need 37 mg of the drug. Draw up the volume in the syringe: what volume V is that?

A solution has a ratio strength of 1:10 000. You need 0.16 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 150 mg. What volume V do you draw up? Round to one decimal place.

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 20% dextrose by mixing 50% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.

Practice exercise (made-up values, not clinical guidance). You have 120 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 1.5% ointment? Round to the nearest whole gram.