Pharmacy Math

Comments (4)

La in Modesto, California

32 months ago

I need help with vet math. Can anyone help or refer, direct or answer my question? I need steps shown. I need to know the formula.

order: 1000 ml 0.9% NaCl and 5% dextrose on hand: 1000 ml 0.9% NaCl and 500 ml 50% dextrose How much of each is needed?

La in Modesto, California

32 months ago

Sorry. I posted it twice because I am in a Vet Class and I am a PT. Hadn't worked in the field since I graduated in 2011. I forgot the formula. I can't find it anywhere on the Internet. Vet tech pharmacology is like a refresher course for me.

CindyRVT in Henderson, Texas

32 months ago

Ok, you are going to solve for x with x being the volume of 50% dextrose needed to produce 1000mls of a 5% solution.

Start out with the formula and fill in the known values with the dextrose solution being the "stock".

conc. of desired solution X vol. of desired solution = concentration of stock X vol. of stock solution

5% X 1000ml = 50% X x
5000 = 50x
100 = x

So you would need 100mls of 50% dextrose solution

Lauren in Minneapolis, Minnesota

7 months ago

The doctor’s order reads start 1 liter of Plasmalyte with 2.5% dextrose. How much Plasmalyte do you remove?

And how much Dextrose do you add if your Dextrose is a 50% solution?

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