Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many mg of bupivacaine are in 30 mL of 0.25% w/v solution? Find m.

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 1 mL?

A solution has a ratio strength of 1:10 000. You need 0.38 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 of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 8.2 mL of diluent. The prescribed dose is 1 200 000 units. What volume V do you draw up? Round to one decimal place.

A vial holds 500 mg of powder. You add 3.2 mL of diluent, and the powder adds 0.8 mL of volume. The prescription is 150 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 250 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.