# Reconstitute math problem help

1. I'm working on dosage calculations problems and this one has me really stumped. It asks to calculate dosage based on 5mg/kg with available dosage being 1 gm, to reconstitute with 7.4 mL sterile water, patient weighs 136 pounds. it wants the dosage in mL, but I'm confused because this is the first problem I've come across that doesn't give any sort of final concentration. How can I find that? I thought i was pretty solid on this math stuff until this problem. Thank you for any help in advance!
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Joined: Jul '12; Posts: 1

3. If you mix one gram of the medication in 7.4 mL of sterile water, can you find a way to use ratios to find the answer?

Another thing to think about: is the concentration even relevant here, or only the final dose?
4. Quote from jnlowe
I'm working on dosage calculations problems and this one has me really stumped. It asks to calculate dosage based on 5mg/kg with available dosage being 1 gm, to reconstitute with 7.4 mL sterile water, patient weighs 136 pounds. it wants the dosage in mL, but I'm confused because this is the first problem I've come across that doesn't give any sort of final concentration. How can I find that?
Looks pretty confusing but let's break it down. I underline what you need to know (I also underline on paper tests because I tend to be visual)

The answer to the question must be in mL -- so you will have to solve for mL.

You know that you have 1 "gm" of a drug suspended in 7.4 mL sterile water
The patient weighs 136 pounds (conversion required so you can do the doseage formula, which is 5 "mg" / "kg").

Now you have everything you need to solve the question. It is so much easier when you break everything down.

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