Final answer:
To determine the quantity of Amantadine per dose for a 35-pound child, convert the weight to kilograms, calculate the total daily dosage, and divide by three doses per day. This results in 26.52 mg per dose, which equates to 2.65 ml of medication per dose given the supply bottle's concentration.
Step-by-step explanation:
How to Calculate Medication Dosage by Weight
To calculate the quantity per dose for Amantadine, you first convert the child's weight from pounds to kilograms. One kilogram is approximately 2.2 pounds, so a 35-pound child weighs about 15.91 kilograms (35/2.2). Given the dosage of 5mg/kg/day divided into three doses, we first calculate the total daily dosage by multiplying the child's weight in kilograms by the per-kilogram dosage:
15.91 kg x 5 mg/kg = 79.55 mg/day
Now divide the total daily dosage by the number of doses:
79.55 mg/day ÷ 3 doses/day = 26.52 mg/dose
Next, we determine how many milliliters of the Amantadine solution are needed per dose using the concentration of the supply bottle (50mg/5ml):
(26.52 mg/dose) ÷ (50 mg/5 ml) = (26.52 mg/dose) ÷ (10 mg/ml) = 2.65 ml/dose
This calculation leads us to the conclusion that the child should be given 2.65 ml of Amantadine per dose.