Need Pharmacology help dealing w/math

truern · Sep 13, 2005

i have a test tomorrow and she gave us a study guide but i'm so lost and have no idea how to figure the following out...if anyone can help i'd really appreciate it!!
1. Depakene 0.75 grams is prescribed. Depankene syrup is labeled 250mg per 5 mL.
Give____ mL
2. Dosage Available: Furoxone 50 mg per tbsp
Dosage ordered: Furoxone suspension 0.1 g po QID
Give____ mL

Happychic, what would you think the first step should be?? You need to get "what you have" in the same unit as "what you need to give"....so convert the grams into milligrams.

Do that, and we'll talk about the next step :)

Happychic · Sep 13, 2005

Happychic, what would you think the first step should be?? You need to get "what you have" in the same unit as "what you need to give"....so convert the grams into milligrams.
Do that, and we'll talk about the next step :)

Ok so if i convert the .75 grams to mg that would be 750 mg

loriangel14, RN · Sep 13, 2005

Then you would dose over stock times the vehicle.750 / 250 x 5. 750 divided by 250 =3. 3 x 5 = 15. You would give 15ml.

loriangel14, RN · Sep 13, 2005

2. 50 mg converts to 0.05g. 0.1g /0.05g = 2. 2 x 1 tsp = 2 tsp or 15 ml

truern · Sep 13, 2005

Or you can say..

250 mg 750 mg

______ = ______

5 mL x mL

cross multiply to get 250x = 3750.

you divide 250x by 250 to get x alone...remember, whatever you do to one side of the equation you have to do to the other side, so you would also divide 3750 by 250.

250x 3750

____ = ____

250 250

x = 15 mL (you know it's mL because you labeled the parts of the equation.

For the second one...

50 mg 100 mg

_____ = ______

1 tbsp x tbsp

cross multiply...50x = 100

divide 50 x by 50 to get the x alone, then divide 100 by 50...x = 2 tbsp

My way *seems* longer, but it's the way we were taught, and it's the one I feel comfortable with :)

Btw...nothing is lining up right...but it's the same as 50 mg/1 tbsp = 100 mg/x tbsp...etc

loriangel14, RN · Sep 13, 2005

Ooops! I read tsp instead of tbsp for number 2. should be 30 ml. I guess I would have got that one wrong. :chuckle

truern · Sep 13, 2005

Ooops! I read tsp instead of tbsp for number 2. should be 30 ml. I guess I would have got that one wrong. :chuckle

Well, I didn't read the whole problem....my answer would have been counted *wrong* on a drug calc test :uhoh21:

:rotfl:

Happychic · Sep 13, 2005

Well, I didn't read the whole problem....my answer would have been counted *wrong* on a drug calc test :uhoh21:
:rotfl:

Ladies thanks so much!!

loriangel14, RN · Sep 13, 2005

Did we help or confuse further? :chuckle

Happychic · Sep 13, 2005

Did we help or confuse further? :chuckle

I was confused at first but i got it now :)

Fun2, BSN, RN · Sep 13, 2005

That's my kind of help! I don't like for someone to just give me an answer, I want to be able to understand how, why, when, where, and what will happen next!

So, when I get to this point, I'll probably be posting for help too. :)

Good luck, happychic! :)