Pharmacy calculations worksheet with answers

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 5 mL?

Practice exercise (made-up values, not clinical guidance). 25 g of glycerin is dissolved in water to a total volume of 100 mL. What is the percentage strength p (% w/v)?

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

A solution has a ratio strength of 1:1000. You need 0.19 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 50 g of 5% coal tar ointment. How many grams m of 1% coal tar ointment must you add to make a 3% ointment? Round to the nearest whole gram.

A vial holds 500 mg of powder. You add 1.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 300 mg. Draw up the dose: what volume V do you give?