Pharmacy calculations worksheet with answers

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

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

A solution has a ratio strength of 1:1000. You need 0.56 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 cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

Practice exercise (made-up values, not clinical guidance). You have 50 g of 10% salicylic acid ointment. How many grams m of 2% salicylic acid ointment must you add to make a 6% ointment? Round to the nearest whole gram.

A vial holds 2000 mg of powder. You add 9.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 800 mg. Draw up the dose: what volume V do you give?