Pharmacy calculations worksheet with answers

Free printable Pharmacy calculations worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
sodium bicarbonate8.4% w/v50 mL? g

Practice exercise (made-up values, not clinical guidance). How many g of sodium bicarbonate are in 50 mL of 8.4% w/v solution? Find m.

8.4% w/v50 mL
m = g
2.Easy
0123455 mL

A solution is 0.5% w/v. You need 23 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v23 mg
V = mL
3.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL2 000 000 units → ? 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 2 000 000 units. What volume V do you draw up? Round to one decimal place.

3.2 mL → 1 000 000 units/mL2 000 000 units
V = mL
4.Medium
penicillin G 5 000 000 unitsdiluent addedconcentration18.2 mL250 000 units/mL8.2 mL500 000 units/mL3.2 mL1 000 000 units/mL800 000 units → ? 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 18.2 mL of diluent. The prescribed dose is 800 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL800 000 units
V = mL
5.Hard
5%100 g+1%coal tar? g3%coal tar

Practice exercise (made-up values, not clinical guidance). You have 100 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.

100 g · 5%1%3%
m = g
6.Hard
70%dextrose? mL+10%dextrose25%400 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 400 mL of 25% dextrose by mixing 70% and 10% dextrose. How many mL V of the 70% solution do you need? Round to the nearest whole mL.

70%10%25%400 mL
V = mL

Answer key

  1. 1. m = 4.2 g
  2. 2. V = 4.6 mL
  3. 3. V = 2 mL
  4. 4. V = 3.2 mL
  5. 5. m = 100 g
  6. 6. V = 100 mL

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