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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Name: ____________________   Date: ____________

1.Easy
0123455 mL

A solution is 0.5% w/v. You need 20 mg of the drug. Draw up the volume in the syringe: what volume V is that?

0.5% w/v20 mg
V = mL
2.Easy
epinephrine1:1 0000.5 mL? mg

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 0.5 mL?

1:1 0000.5 mL
m = mg
3.Medium
ceftriaxone 2 gAdd 19.2 mL sterile water.Powder volume: 0.8 mL.1200 mg → ? mL

Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 2000 mg as a powder. The practice label says to add 19.2 mL of sterile water; the powder adds 0.8 mL to the volume. The prescribed dose is 1200 mg. What volume V do you draw up? Round to one decimal place.

2000 mg19.2 mL+0.8 mL1200 mg
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/mL1 200 000 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 1 200 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL1 200 000 units
V = mL
5.Hard
70%dextrose? mL+10%dextrose40%1500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 1500 mL of 40% 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%40%1500 mL
V = mL
6.Hard
90%ethanol+0%water? mL45%500 mL

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 45% ethanol from a 90% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

90%0%45%500 mL
V = mL

Answer key

  1. 1. V = 4 mL
  2. 2. m = 0.5 mg
  3. 3. V = 12 mL
  4. 4. V = 4.8 mL
  5. 5. V = 750 mL
  6. 6. V = 250 mL

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