# 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

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Joined: Oct '07; Posts: 41; Likes: 11
Paediatric Nurse; from AU

3. 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. 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. 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