A solution contains 100 mg/mL of a drug, and the recommended dose is 50 mg/lb once a day.?

Question

How much solution would be needed for one dose to be administered to a 20 kg patient?

Answer 1

1. Since recommended dose is in mg/lb, we have to find out how many pounds (not kilograms) this patient weights:

  1 kg=2.2 lbs

20 kg=x          

x=(20 kg*2.2 lbs) / 1 kg      

x=44 lbs

He weights 44lbs.

2. The recommended dose is 50 mg/lb , which makes 2200 mg for this patient ( we have to multiply the dose by patient's weight   50*44=2200mg).  It means, this patient has to receive 2200 mg once a day.

3.  There is 100mg of medicine in each ml of solution. We have to find out  how many ml of solution contains 2200mg of medication.

100 mg=1 ml

2200mg= x

                      x=(2200mg*1 ml ) /100mg

                      x=22 ml

Answer: 22 ml of solution would be needed for one dose to be admisinstered  to a 20 kg patient.