Dosage calculation practice problems 2021 study set

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 Ordered: 117 mg/kg over 12 hours Available: 260 mg/3 mL Patient weighs 220 lbs What drip rate (mL/hr)? 220 lbs/2.2 = 100 kg 117 x 100 = 11700 mg (11700/260)3 = 45 mL over 12 hrs 45/12 = 3.75 mL/hr Ordered: 6 mL over 12 hours Available: 120 mg/4 mL How many mg will the patient receive after 6 hours? (6 mL/4 mL)120 mg = 180 mg over 12 hrs Since 6 hrs is half of 12 hrs, the patient will receive half of the total mg. Thus, 180/2 = 90 mg Ordered: 196 mg tid Available: 56 mg scored tablets How many tablets in one day? 196/56 = 3.5 tablets per dose 3.5 x 3 = 10.5 tablets Ordered: 1 spray bid Available: 64 mcg per inhalation How many mg will the patient receive in one week? 64 mcg x 2 = 128 mcg per day 128 x 7 = 896 mcg per week 896/1000 = 0.896 mg per week Ordered: 0.03 mg over 8 hours Available: 6 mcg/2 mL What drip rate (mL/hr)? 0.03 = 30 mcg (30/6)2 = 10 mL over 8 hrs 10/8 = 1.25 mL/hr