Question

A physician orders Lanoxin elixir 125 mcg daily for a child. The medication available is digoxin elixir 0.05mg/ml. How many milliliters are needed for a one-month supply?
A .60ml
B.75ml
C.30ml
D.45ml
please explain your answer.

Answer 1

B. For one - month supply 75 ml is needed.

Explanation:

First we have to convert mcg (micro gram) to milligram (mg) by using the conversion factor as,

1 mcg = 0.001 mg

So 125 mcg = 125 × 0.001 mg = 0.125 mg

1 ml of Digoxin elixir contains 0.05 mg

Now we need to find the milliliters needed for a day and then for a month.

x = $\frac{0.125 mg/ml}{0.05 mg}$ = 2.5 ml per day

For 30 days we have to multiply 2.5 ml by 30 as,

2.5 ml × 30 = 75 ml is needed for a month.