Help Dosage Calculation

beth66335, BSN, RN · Oct 20, 2007

I get dosage calculation except when it comes to reconstitutions of oral Rx (like when you add say water). Can anyone help me please? I use the d/h *Q method. I am just beside myself saying I think am smarter than a 5th grader!!!! Can anyone also give me some problems to work on as well. Thank you in advance for any assistance.

Are you talking about meds that are added to water and then so many ml are given orally? The problems I have seen like this should give you a label to look at, or text of the info on the label. The info should tell you how much water to add and then how many mg/ml you will have in the solution. I do ratio and proportion on these problems. Give an example of one for us to see what is stumping you.

nyapa, RN · Oct 20, 2007

can you give an example of the sort of problem you are looking at solving?

Neats, BSN · Oct 20, 2007

OK here are a few examples that I have and again I want to thank anyone who replies to this SOS.

Order 3g IM q8hr Moxam

Available 10g vial reconstituted: add 8ml diluent which equals 10 ml of reconstituted solution

? How many ml of reconstituted solution are equivalent to 3g of Moxam?

Another exmple is Order 500mg Azactam IM q8hr

Have 1g vial, add 3ml of diluent, which equals 3.5 of reconstituted solution

?. How many ml of reconstituted solution would you give per dose?

Anyone answering if you could point me to examples on this website I would thank you so much...I have searched and could not find any.

beth66335, BSN, RN · Oct 20, 2007

OK here are a few examples that I have and again I want to thank anyone who replies to this SOS.
Order 3g IM q8hr Moxam
Available 10g vial reconstituted: add 8ml diluent which equals 10 ml of reconstituted solution
? How many ml of reconstituted solution are equivalent to 3g of Moxam?
Another exmple is Order 500mg Azactam IM q8hr
Have 1g vial, add 3ml of diluent, which equals 3.5 of reconstituted solution
?. How many ml of reconstituted solution would you give per dose?

Is the second one 10 grams in 10ml after reconstitution?

If so it would be,

10g:10ml::3g:Xml

10g=30ml

X=3ml

I hope this makes sense!

The second one is,

1000mg(1g):3.5ml::500mg:Xml

1000mg=1750ml (3.5x500)

X= 1.75ml

Rage, RN · Oct 20, 2007

Is the second one 10 grams in 10ml after reconstitution?
If so it would be,
10g:10ml::3g:Xml
10g=30ml
X=3ml
I hope this makes sense!
The second one is,
1000mg(1g):3.5ml::500mg:Xml
1000mg=1750ml (3.5x500)
X= 1.75ml

I do it a little bit different.........

I use logic instead of ratios. If you have 10 grams in 10 ml then you have 1 g to 1 ml.......3 grams would be 3ml

In the second one if you have 1 gram to 3 ml and end up with 3.5 ml then 1/.500(ordered)=2, 3.5/2=1.75ml.....same results just easier for me...........