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Old 01-Jun-2008, 17:18
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Default Drug calculations
Can anyone please explain to me an easy/easier way to learn about drug calculations?

I am worried sick that I am going to get this in my clinical skills exam and I just don't understand it at all, maths is my worst ever subject at the best of times?

Thanks in advance.
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Old 01-Jun-2008, 18:44
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Default Re: Drug calculations
Right, am off to get the bumpf on this, we learned it practice it and now I have forgotten it!

hahahah, at least I am consistent!

brb
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Old 01-Jun-2008, 18:48
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Default Re: Drug calculations
Hahaha a girl after my own heart smwife lol. Thanks hun x
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Old 01-Jun-2008, 19:00
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Default Re: Drug calculations
volume required= dose required X volume of stock solution
stock strength

volume required = what you want X what it's in
what you've got


grams -milligrams 0.1G to 100 MG

Milligrams to micrograms 0.1 G = 100MCG

calculate IV flow sets (varies according to giving set used)

volume in Mls X drop factor
_

time (minutes)
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Old 01-Jun-2008, 19:04
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Default Re: Drug calculations
Thanks very much for that smwife,

I have printed it out so hopefully I can learn it in time for my clinical skills exam. I am bound to get this as it is the one I am weakest at lol.
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Old 01-Jun-2008, 19:05
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Default Re: Drug calculations
So will do a few examples

and we'll see how we go....

1. A solution of 100mg/ml, how many mls to give 250 mg?

So we calculate by 250
100 X 1 = ?

250
100x 1 = 2.5mls

2. Paracetamol syrup, 30mg/ 5ml how much syrup for 18 mg?
18
30 X 5= 3mls

This one is for you Missy

Metronidazole 500mg/100ml bag how much for 200mg?

?????
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Old 01-Jun-2008, 19:06
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Default Re: Drug calculations
it's difficlut to type the sums, but division is meant by one number over another, IYSWIM?

give the above one a go, MM?
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Old 01-Jun-2008, 19:10
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Default Re: Drug calculations
Originally Posted by smwife View Post
So will do a few examples

and we'll see how we go....

1. A solution of 100mg/ml, how many mls to give 250 mg?

So we calculate by 250
100 X 1 = ?

250
100x 1 = 2.5mls

2. Paracetamol syrup, 30mg/ 5ml how much syrup for 18 mg?
18
30 X 5= 3mls

This one is for you Missy

Metronidazole 500mg/100ml bag how much for 200mg?

?????
I really have no idea, but will guess at 250 ml????


Told you I was thick lol
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Old 01-Jun-2008, 19:13
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Default Re: Drug calculations
no, you're not! use the above sums (of the fisrt two questions, use a calculator, it's ok!)

Divide 500 by 200 and then multiply by 100

500
200 X 100

=?????
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Old 01-Jun-2008, 19:18
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Default Re: Drug calculations
Ok lol,

Divivde 500 by 200 = 25
then multiply by 100 = 250

Am I going wrong somewhere lol?


Originally Posted by smwife View Post
no, you're not! use the above sums (of the fisrt two questions, use a calculator, it's ok!)

Divide 500 by 200 and then multiply by 100

500
200 X 100

=?????
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