Question

Order: Tavist 0.05 mg/kg/day PO divided into 2 doses. The label states 0.8mg/5mL." Calculate how many milliliter of this antihistamine you will administer to a child who weighs 41 pounds.

Answer 1

Step 1: Conversion of baby weight from pounds to kgs:

1 pound = 0.453 kgs, so 41 ponds = 41*0.453 = 18.60 kgs.
So,

41 pounds = 18.60 kgs.

Step 2:  Required amount of Tavist per dosage:

The required amount of Tavist per day for this child  = 0.05*18.60 = 0.93 mg per day,
as 2 doses per day, per single dose the dosage quanity is 0.465 mg per dose.

Step 3: The requried quanity to administrate to child is:
0.8 mg / per 5 ml;
for 0.465 mg:

= (0.465*5)/0.8= 2.91 ml.

So, the answer is 2.91 ml.

2.91 milliliters of this antihistamine will administrate to a child who weighs 41 pounds