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Module 3: Calculating Medication Dosages - Practice Problems
Answers Using Dimensional Analysis
Problem Dimensional Analysis
Order = gr 3/ Available = 30 mg tablets
Give___________
xgr tablets gr
mg mg
xtablets tab 1. 5 30
^1
Give 1.5 tablets
Order = 100 mg Available = 125 mg/5 mL
Give___________
x mg mL mg
xmL mL 4 125
^5
Give^ 4 mL
Order = 50 mg Available = 80 mg/2 mL
Give___________
x mg mL mg
xmL mL 1. 25 1. 3 80
^2
Give^ 1.3 mL
Order = 0.5 g Available = 250 mg capsules
Give___________
x g capsules g
mg mg
xcapsules cap 2 250
^1
Give^ 2 capsules
Order = 0.24 g Available = 80 mg per 7.5 mL
Give___________
x g mL g
mg mg
xmL mL 22. 5 80
^7.^5
Give^ 22.5 mL
Order = 20 mg Available = 10 mg per 15 mL
Give___________
x mg mL mg
xmL mL 30 10
^15
Give^ 30 mL
Order = 35 mg Available = 40 mg/2.5 mL
Give___________
mg mL mg
xmL mL 2. 18 2. 2 40
^2.^5
Give^ 2.2 mL
Order = 200 mg Available = 0.5 g per mL
Give___________
x mg mL mg
g g
xmL mL 0. 4 500
^1
Give^ 0.4 mL
Order = 0.05 mg Available = 50 mcg tablets
Give___________
x mg tablet mg
mcg mcg
xtablets tab 1 50
^1
Give^ 1 tablet
Order = 100 mg Available = 50 mg capsules
Give___________
mg capsules mg
xcapsules cap 2 50
^1
Give^ 2 capsules
Order = 250 mcg Available = 2.5 mg per 2 mL
Give___________
x mcg mL mcg
mg mg
xmL mL 0. 2 2500
^2
Give^ 0.2 mL
Order = 120 mg Available = 0.12g tablets
Give___________
x mg tablet mg
g g
xtablets tab 1 120
^1
Give^ 1 tablet
Order = 1 g Available = 1000 mg tablets
Give___________
x g tablet g
mg mg
xtablets tab 1 1000
^1
Give^ 1 tablets
Order = Lanoxin 0.25 mg Available = Lanoxin 0.125 mg/tablet
Give___________
mg tablets mg
xtablets tab 2
- 125
^1
Give^ 2 tablets
Order = Morphine gr 1/ Available = Morphine 2 mg/mL
Give___________
xgr mL gr
mg mg
xmL mL 0. 15 0. 2 2
^1
Give^ 0.2 mL
Order = Digitoxin 0.2 mg Available = Digitoxin 0.1 mg tablets
Give___________
mg tablets mg
xtablets tab 2
- 1
^1
Give^ 2 tablets
Order = Phenobarbital 30 mg Available = Phenobarbital 15 mg/tablet
Give___________
mg tablets mg
xtablets tab 2 15
30 1
30 15
^1
Give^2 tablets
Order = Tylenol gr X Available = Tylenol 300 mg tablets
Give___________
xgr tablets gr
mg mg
xtablets tab 2 300
^1
Give^ 2 tablets
Order = Heparin 7500 units Available = Heparin 10,000 units/mL
Give___________
units mL units
xmL mL 0. 75 0. 8 10000
^1
Give^ 0.8 mL
Order = Capoten 12.5 mg Available = Capoten 25 mg tablets
Give___________
mg tablet mg
xtablets tab 0. 5 25
^1
Give^ 0.5 tablet
Order = Codeine gr 1 Available = Codeine 30 mg/tablet
Give___________
xgr tablets gr
mg mg
xtablets tab 2 30
^1
Give^ 2 tablets
Order = Ciprofloxacin hydrochloride 375 mg Available = Ciprofloxacin hydrochloride 750 mg tablet
Give___________
mg tablet mg
xtablets tab 0. 5 750
^1
Give 0.5 tablet
