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

Mean while Lanoxin contains the active substance digoxin, which belongs to a group of medicines called cardiac glycosides. It is used to treat arrhythmias and heart failure. An arrhythmia is an irregularity in the heart-beat, which causes the heart to skip a beat, beat irregularly or beat at the wrong speed.

1ml is found in 0.05mg

unknown (x) will be found in 0.125 mg

Cross multiply making X the subject of the formula

X = 0.125 mg*ml ÷0.05 mg = 2.5 ml

Assming a 30 days period for a month :

Since 2.5 ml is needed for one day
Unknown (Y) will be needed for 30 days

We cross multiply making Y the subject of the formula

Y = 2.5 ml * 30 = 75 ml

proz proz · Answer 2 · 2020-03-20T07:10:49+01:00

Answer:

The correct answer is:

75ml (B.)

Explanation:

First of all let us lay out the details in the question for ease of understanding:

Lanoxin elixir = 125 mcg (mcg is microgram) daily

digoxin elixir = 0.05mg/ml (mg is milligram; ml is milliliters)

Next, let us find the relationship between the two units of both drugs, that is the relationship between microgram (also written as μg) and milligram (mg).

1 mg = 1000 μg (microgram)

therefore, 0.05 mg = 1000 × 0.05 = 50 μg.

So the concentration of digoxin elixir can also be written as 50 μg/ml

Next let us find the the total amount of Lanoxin elixir to be taken for a month (30 days);

since daily amount = 125 μg

therefore, 30 days = 125 × 30 = 3,750 μg (microgram)

Finally let us find the number of millilitres of digoxin elixir that will contain 3,750 μg;

for digoxin elixir;

0.05 mg = 1 ml

50 μg = 1ml (solved above)

∴ 3,750 μg = (1 ÷ 50) × 3750 = (3750 ÷ 50) = 75 ml.