Drug Calculations Conversion Chart (Page 5 of 5) in pdf

Drug Calculations Conversion Chart Page 5

E X A M P L E

Your 70 kg client is currently receiving an infusion of dopamine at 10 mL/hr. Your medication

dilution is 250 mg dopamine in 100 mL 5% glucose solution.

Formula method

Ratio method

250

1000

2 500 000

(1) First calculate the dose for the client’s weight.

× µg/min : 10 mL/hr/60

100

420 000

= 5.9 µg/kg/min of

250 mg × 1000 :

100 mL

× µg/min

dopamine being

10 mL/hr/60

250 mg × 1000

administered

100 mL

= 416.7 µg/min

(2) Now calculate the dose for 1 kg.

× µg/kg/min : 1 kg

416.7 µg/min : 70 kg

× µg/kg/min

1 kg

416.7 µg/min = 70 kg

= 5.9 µg/kg/min

CALCULATION OF DOSE REQUIRED FOR A CHILD USING BODYWEIGHT

Formula method

Child’s weight (kg) × Unit dose (per kg) = Required dose

E X A M P L E

A 5-year-old child weighing 18 kg is ordered penicillin G (benzyl penicillin) to be given IV 4

hourly for the treatment of a severe respiratory infection. The recommended dose of penicillin

G for a severe infection is 100 000 u (60 mg)/kg/dose every 4 hours. What dose would you

administer?

Dose (mg) = 18 kg × 60 mg/kg

= 1080 mg

APPENDIX D

Drug Calculations Conversion Chart Page 5