DOSAGE CALCULATION PRACTICE
PROBLEMS
Ordered: 250 mg
Available: 100 mg/2 mL
(250/100)2 = 5 mL
Ordered: 100 mg
Available: 0.05 g tablets
0.05 g = 50 mg
100/50 = 2 tablets
Ordered: 8 mcg/kg/hr
Available: 0.64 mg/2 mL
Patient weighs 80 kg
What drip rate (mL/hr)?
8x80 = 640 mcg
0.64 = 640 mcg
(640/640)2 = 2 mL
Ordered: 24 mg over 8 hours
Available: 96 mg/4 mL
What drip rate (mL/hr)?
(24/96)4 = (0.25)4 = 1 mL
1 mL / 8 hrs = 0.125 mL/hr
Ordered: 400 mcg
Available: 0.08 mg/0.5 mL
0.08 mg = 80 mcg
(400/80)0.5 = 2.5 mL
