Posology

Step 1: Understand Clark’s formula.
Clark’s formula is used to calculate the pediatric dose based on the child’s weight. The formula is: Step 2: Apply Clark’s formula.
The adult dose is 100mg, and the child's weight is 12Lbs. Plugging these values into the formula: Step 3: Conclusion.
The correct dose for a child weighing 12Lbs is 8mg. Thus, the correct answer is (1) 8mg.