Question

You have to prescription for an infant, who weighs 9 kg, with 20 doses containing 2 mg/kg of metoprolol to be prepared as a powder, the minimum weight for a powder is 120 mg. Metoprolol is available in 50 mg and 100 mg tablets. Complete the following working formula using the smallest number of tablets of the same strength. Ingredient formula quantity measured quantity 2.57 g 2 metoprolol tablets 50 mg x х lactose to 120 mg to 50 mg | X 1 2 3 4 5 10 mg 20 mg 30 mg 40 mg 50 mg 10 mg 14 mg 18 mg 22 mg 59 mg 100 mg 500 mg 1.80 g 2.40 g 2.57 g 2.67 g 3.50 g 5.40 g 5.60 g 6.0 g

Answer 1

Metroprolol:

Formula quantity = 9*2 = !8 mg

Measured quantity = 40 mg * 6 tablets = 240 mg

Lactose:

Formula quantity = 120 mg

It makes the total dose of the metroprolol to 240 + 120 = 360 mg. (This dosgae is required for the infant as 18 mg is to be given in 20 doses; 18*20 = 360mg)