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
benzalkonium chloride1:2 000100 mL? mg

Practice exercise (made-up values, not clinical guidance). A solution of benzalkonium chloride has a ratio strength of 1:2 000. How many milligrams m are in 100 mL?

1:2 000100 mL
m = mg
2.Easy
0123455 mL

A solution is 2% w/v. You need 40 mg of the drug. Draw up the volume in the syringe: what volume V is that?

2% w/v40 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/mL750 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 750 000 units. What volume V do you draw up? Round to one decimal place.

18.2 mL → 250 000 units/mL750 000 units
V = mL
4.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
5.Hard
5%50 g+1%coal tar? g2%coal tar

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 2% ointment? Round to the nearest whole gram.

50 g · 5%1%2%
m = g
6.Hard
10%50 g+2%salicylic acid? g6%salicylic acid

Practice exercise (made-up values, not clinical guidance). You have 50 g of 10% salicylic acid ointment. How many grams m of 2% salicylic acid ointment must you add to make a 6% ointment? Round to the nearest whole gram.

50 g · 10%2%6%
m = g

Answer key

  1. 1. m = 50 mg
  2. 2. V = 2 mL
  3. 3. V = 3 mL
  4. 4. V = 12 mL
  5. 5. m = 150 g
  6. 6. m = 50 g

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