# drug claculations

Published

can anyone answer this question or give me the formula?

You are asked to give glucose 20mg IV. you have a bag of glucose 5%. what volume are you going to infuse?

347 Posts

Specializes in MICU. Has 3 years experience.

If thats all the question, then Since there is 5g/100ml

So...20mg×(100ml/5000mg)×60min because it is an Iv. That would give you 24 ml/hr

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If there are 5mg per 100mL then there are 10mg per 200mL, 15mg per 300mL, and 20mg per 400mL... There's your volume.

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If thats all the question, then Since there is 5g/100ml

So...20mg×(100ml/5000mg)×60min because it is an Iv. That would give you 24 ml/hr

There's nothing in the problem statement which says anything about time or flow rate.

347 Posts

Specializes in MICU. Has 3 years experience.

However it seems like the question is incomplete though and I think 5% is 5g/100ml not 5mg/100ml according to calculating with confidence by mosby

2 Articles; 2,560 Posts

Specializes in Hospice, Palliative Care. Has 3 years experience.

I believe lofoffrn is correct that the question is incomplete. While music in my heart is correct there's no mention of flow rate, the question doesn't seem complete.

844 Posts

I get 0.4mL

100mL/5g * 20mg * 1g/1000mg = 0.4mL

(This is the drawn-out equation so that you can see the conversions.)

2 Articles; 5,114 Posts

See, this is a CHEMISTRY question. Before you go anywhere at all, you have to think back to your chemistry prerequisite and remember what a 5% solution is and how you would make it, and why that is. And you have to remember your conversions.

Water weighs 1gm per cc, remember that?

So 100cc = 100 grams

A 5% solution would be 5grams in 100 grams, which is the same thing as 5 grams in 100cc. Or 5000mg in 100cc. How many mg is in 1 cc, then?

So how many cc would 20mg be?

1 Article; 7,349 Posts

Specializes in Pedi. Has 16 years experience.
If there are 5mg per 100mL then there are 10mg per 200mL' date=' 15mg per 300mL, and 20mg per 400mL... There's your volume.[/quote']

5 GRAMS per mL, not 5 mg.

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