Need Pharmacology help dealing w/math

  1. 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
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  2. 11 Comments

  3. by   truern
    Quote from Happychic
    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
  4. by   Happychic
    Quote from truesn
    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
  5. by   loriangel14
    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.
  6. by   loriangel14
    2. 50 mg converts to 0.05g. 0.1g /0.05g = 2. 2 x 1 tsp = 2 tsp or 15 ml
  7. by   truern
    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
    Last edit by truern on Sep 12, '05
  8. by   loriangel14
    Ooops! I read tsp instead of tbsp for number 2. should be 30 ml. I guess I would have got that one wrong. :chuckle
  9. by   truern
    Quote from loriangel14
    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:

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


    Ladies thanks so much!!
  11. by   loriangel14
    Did we help or confuse further? :chuckle
  12. by   Happychic
    Quote from loriangel14
    Did we help or confuse further? :chuckle

    I was confused at first but i got it now
  13. by   Fun2, RN, BSN
    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!

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