PLS HELP Medication Exam tommorow need to check to see if on the right track

  1. [font=fixedsys]hi everyone please can u help me

    [font=fixedsys]were having a medications calculations exam on monday- tomorrow and i was just wondering if u could share ur light on this question please? i think it is right but 3 other people in my class got different answers to me! it seems easy but maybe im missing something.

    [font=fixedsys]the question is

    jenny aged 6 years is ordered phenergan 2mg per kg of her body weight. she weighs 20kg. stock strength in hand is 25mg/5ml. how many ml will you administer?

    [font=fixedsys]i worked this out by 2 x 20 = 40
    [font=fixedsys]40 x 5 = 8ml
    [font=fixedsys]25

    [font=fixedsys]is this what you would do please help asap exam tomorrow
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  2. 3 Comments

  3. by   shock-me-sane
    I got the same thing as you.

    20kg x 2mg/kg = 40 mg dose

    40 mg ------ 25 mg
    ------- = ---------
    x mL ------- 5 mL

    cross multiply
    200 = 25x
    x = 8mL

    sorry can't figure out how to make it look right without the dashes
    Last edit by shock-me-sane on Oct 21, '07
  4. by   rachiee
    thanks muchly! If anyone comes up with anything different can you please let me know asap i really dont want to fail!!! :P

    Thanks everyone
  5. by   Daytonite
    jenny aged 6 years is ordered phenergan 2mg per kg of her body weight. she weighs 20kg. stock strength in hand is 25mg/5ml. how many ml will you administer?
    by dimensional analysis. . .
    2 mg/1 kg (dose desired) x 20 kg/1 (patient's weight) x 5 ml/25 mg (dose on hand) = 8 ml to administer

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