Pediatric Dosage Calculation Tutorial Answers

  1. 48 lbs /2.2= 21.81818182= 21.8 kg

13.9 lbs/2.2= 6.3181818181= 6.3 kg

  1. 45lbs/2.2= 20.4545454545= 20.5 kg

30mg x 20.5kg= 615 mg/day to be given three times daily

615mg/3= 205 mg per dose

The 24 hr drug total is 615 mg

3.  45lbs/2.2= 20.4545454545= 20.5 kg

30mg/20.5kg= 615mg per dose to be given three times daily

615mg x 3= 1845mg

1845mg is the 24 hr drug total

4.  47lb/2.2 = 21.3636363636= 21.4kg

Calculate the range to determine if the ordered dose is safe

3mg x 21.4kg = 64.2mg /day to be given bid

64.2mg/2= 32.1 mg bid (this is the low range dose)

5mg x 21.4kg= 107mg/day to be given bid

107mg/2= 53.5 mg bid (this is high range dose)

The MD order is 40 mg bid (80mg/day)

The safe range is 32.1mg-53.5 mg bid, so 40 mg bid is safe or the safe daily total 64.2mg-107 mg/day and 80 mg/day is safe

5. 75 mg X 5ml = 1.5 mL

250 mg

6. 100mg x 5ml = 20mL

25 mg

7. a. 2.8 mg, b. 0.61 mL, c. 8.9 mL, d. 0.79 mL, e. 13.1 kg

8. 28lbs/2.2= 12.7272727273= 12.7 kg

150mg x 12.7= 1905 mg/day

1905mg/2 = 952.2 mg per dose

952.2mg x 5 = 9.525=9.5 mL

500 mg

9. 21lb/2.2= 9.5454545454= 9.5 kg

2mg x 9.5kg=19 mg/day to be divided 6 times a day (q 4 hrs)

19mg/6= 3.1666667= 3.2mg given q 4 hrs (this is the low safe dose)

4mg x 9.5kg = 38 mg/day to be divided 6 times a day (q 4 hrs)

38mg/6=6.3mg given q 4 hrs

MD ordered 8mg q 4 hrs = 48 mg/day

Safe range is 3.2mg-6.3mg q 4 hrs or 19mg-38mg/day

•  NOT SAFE

10.  50mcg=0.05 mg

0.05mg x 1 = 0.25mL (not 0.3 mL)

0.2 mg

11. 11 lb/2.2 = 5 kg

20mg x 5 = 100 mg

100mg = 2 tablets

50 mg

12. 1000ml x 10 = 16.66667= 17 gtt/min

600 min