Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). 100 g of dextrose is dissolved in water to a total volume of 200 mL. What is the percentage strength p (% w/v)?

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

Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 3.2 mL of diluent. The prescribed dose is 750 000 units. What volume V do you draw up? Round to one decimal place.

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. What is the concentration C in mg/mL after reconstitution?

Practice exercise (made-up values, not clinical guidance). You have 60 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 500 mg of powder. You add 4.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 260 mg. Draw up the dose: what volume V do you give?