Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). A solution of epinephrine has a ratio strength of 1:1 000. How many milligrams m are in 0.3 mL?

A solution is 5% w/v. You need 170 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 0.76 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 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. 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 20 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 2000 mg of powder. You add 2 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 1360 mg. Draw up the dose: what volume V do you give?