Am I setting the problem up wrong? Dosage Calc question...

Published

I can not for the life of me see where I am going wrong, this is the only question I've been hung up on. The question reads

"How many mL of Levofloxacin (Levaquin) will you give in each does? Round to the nearest whole number"

Levofloxacin (25 mg/mL) at 16mg/kg/day, divided q12h.

Ok, what I have already answered for other questions is the fact that the patient weighs 92 kg (202.4lbs) , the previous question also asked how many mg of Levofloxacin will I give in 24 hours, I answered 1472 mg, the answer was correct. Now as far as how I set the equation up to answer the above question

736mg(1mL/25mg) (i did 736 because it is half of 1472 which is the dosage for the entire day) maybe this is where I am going wrong... any pointers would be greatly appreciated.

The correct answer is 9mL , I just haven't been able to arrive at it yet :/

Up Vote Up Vote ×
Specializes in being a Credible Source.

I get 29 mL every 12 hours. Perhaps the 9 is a typo???

Here's how I did it:

Up Vote Up Vote ×
Specializes in Gerontology.

I can't seem to get 9 mls either.9 mls would only give a dose of 225mg? I get 29 mls which is a heck of a lot to give!

Up Vote Up Vote ×

29mL is what I get too

Up Vote Up Vote ×

I got 29mL also!!!!!!!!!!!!!! I have sat here for an hour perplexed, I even started dinner late because I was frazzled :/

Up Vote Up Vote ×

Thank you ladies for chiming in, I will continue with the rest of my studies and inquire with my classmates as to what they came up with.

Up Vote Up Vote ×
Specializes in Pedi.

9 mL x 25mg/mL is a dose of 225 mg. This is clearly wrong if the patient's daily dose is 1472 mg divided q 12hr. 9 mL has to be a typo... the answer should be 29 mL but that is a LOT of medicine to be giving. I hope this person has a feeding tube if you need to administer this volume of medication. ;)

Up Vote Up Vote ×

This was a case study on Calculate with Confidence, a self study program we have to do for Concepts. I wish it were more instructor led for situations such as this :/

Up Vote Up Vote ×
Specializes in being a Credible Source.

Straight up, the answer for the given parameters is 29 mL. It's not subjective, it's simple math. The answer that you were provided is wrong.

It sucks to waste so much time trying to get to an impossible answer.

The good news is, you know what you're doing!

Up Vote Up Vote ×
Specializes in being a Credible Source.
Thank you ladies for chiming in
Hey, what about me?
I will continue with the rest of my studies and inquire with my classmates as to what they came up with.
Regardless of you ~they~ came up with, your answer is correct.
Up Vote Up Vote ×

I'm so sorry "Music in my

Up Vote Up Vote ×

I also found it very tacky that there were no tutorials or anything as to how they came up with their answer! I checked the book and other modules but nothing. You'd think they'd know better than to give an answer without a rationale *shrugs*

Up Vote Up Vote ×
+ Join the Discussion