In: Chemistry
A pediatrician orders Cephalexin 12.5 mg/ kg by mouth (po) every 12 hours (bid). The child weighs 33 pounds (lbs). The pharmacist provides you with Cephalexin oral suspension 100 mg/mL. How many milliliters (mL) of Cephalexin will you administer bid? (1 kg = 2.2 lbs) HLEP! I NEED ANSWER ASAP!
Given weight of child = 33 pounds
= 33 x (1/2.2) kg Since 1 kg = 2.2 lbs ---> 1 lb = (1/2.2) kg
= 15 kg
The dosage is 12.5 mg / kg
So for 1 kg the mass of Cephalexin is 12.5 mg
for 15 kg the mass of Cephalexin is 12.5x15 = 187.5 mg
Also the Cephalexin oral suspension 100 mg/mL
for 100 mg the volume is 1 mL
for 187.5 mg the volume is (187.5x1) / 100
= 1.875 mL