Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many mg of lidocaine are in 5 mL of 1% w/v solution? Find m.

A solution is 2% w/v. You need 92 mg of the drug. Draw up the volume in the syringe: what volume V is that?

A solution has a ratio strength of 1:1000. You need 0.16 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 cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 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 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.

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 6% hydrogen peroxide from a 30% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.