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7 Cards in this Set
- Front
- Back
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YOUNG'S RULE
(Age of child in years) / (Age of child in years + 12) x adult dose = |
child's dose
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CLARK'S RULE
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(Weight of child in pounds / 150) x adult dose = child's dose
ALWAYS USE POUNDS AS THE UNIT FOR WEIGHT WHEN USING CLARK'S RULE! |
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A child weighs 40 lb and is 5 years old. The adult dose for Drug "A" is 250mg. Calculate the correct dose for the child using both Young's and Clark's rules
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YOUNG'S RULE
(5) / (5 + 12) x 250 = 73.5mg CLARK'S RULE (40 / 150) x 250 = 66.7 mg |
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A 2 y/o child weighs 11.4 kg. The adult dose for Drug "B" is 125mg. Calculate the correct dose for the child using both Young's and Clark's rules
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YOUNG'S RULE
(2) / (2 + 12) x 125 = 17.9mg CLARK'S RULE First change kg to lb 11.4 x 2.2 = 25.08lb (25 / 150) x 125 = 20.8 mg |
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A 2 year old child weighs 10kg. The adult dose for the drug to be used is 80mg. Calculate the appropriate dose for the child using Young's Rule.
11.4 mg 9.9 mg 14.8 mg 5.0 mg |
11.4 mg
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A 7 year old child who weighs 48 lbs requires a drug whose adult dose is 400 mg. What would be the correct dose for the child according to Clark's rule?
147 mg 135 mg 128 mg 66 mg |
128 mg
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Considerations that make dosing drugs in children much more difficult then in adults include:
incompletely developed enzyme systems difficulty in swallowing capsules difficulty in remembering to take their doses school doses of medication |
incompletely developed enzyme systems
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