Final answer:
Using Clark's rule, the calculated dose for a 5-year-old child weighing 22 lbs with an adult dose of 250 mg is approximately 36.67 mg.
Step-by-step explanation:
To compute a child's dose using Clark's rule, you take the weight of the child in pounds, divide it by 150 (as the standard adult weight), and then multiply the result by the adult dose. For our given problem, we have a 5-year-old child who weighs 22 lbs, and the adult dose is 250 mg.
Applying Clark's rule, the formula is: (weight of child / 150) × adult dose = child's dose.
Child's dose = (22 lbs / 150) × 250 mg = 0.1467 × 250 mg = 36.675 mg.
Therefore, the computed dose for the 5-year-old child who weighs 22 lbs is approximately 36.67 mg