Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). Express the ratio strength 1:500 as a percentage strength p (% w/v).

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:10 000. How many milligrams m are in 1000 mL?

A solution has a ratio strength of 1:1000. You need 0.72 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 contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 500 mg. What volume V do you draw up? Round to one decimal place.

Practice exercise (made-up values, not clinical guidance). You have 60 g of 2.5% hydrocortisone ointment. How many grams m of 0.5% hydrocortisone ointment must you add to make a 2% ointment? Round to the nearest whole gram.

Practice exercise (made-up values, not clinical guidance). You must prepare 450 mL of 30% dextrose by mixing 70% and 10% dextrose. How many mL V of the 70% solution do you need? Round to the nearest whole mL.