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A pediatrician orders Cephalexin 12.5 mg/ kg by mouth (po) every 12 hours (bid). The child...

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Chemistry

A pediatrician orders Cephalexin 12.5 mg/ kg by mouth (po) every12 hours (bid). The child weighs 33 pounds (lbs). The pharmacistprovides you with Cephalexin oral suspension 100 mg/mL. How manymilliliters (mL) of Cephalexin will you administer bid? (1 kg = 2.2lbs) HLEP! I NEED ANSWER ASAP!

Answer & Explanation Solved by verified expert
3.9 Ratings (728 Votes)

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

  
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