[lil' girl]

drops over time, times ml

like this 60gtt/20min X 25 ml = First 20 goes into 20 1 time and 20 goes into 60 3 times so it is 3/1 x 25 = 75 gtt

AS for when to divide or multiply simply if you want more you multiply and if you want less divide.

[lpnlpn]

Originally Posted by lil' girl

drops over time, times ml

like this 60gtt/20min X 25 ml = First 20 goes into 20 1 time and 20 goes into 60 3 times so it is 3/1 x 25 = 75 gtt

AS for when to divide or multiply simply if you want more you multiply and if you want less divide.

Well thanks to you I can convert and due simple calculations but this I simply don't get HELP!!!you have tetracycline syrup 1.5 G in a (apothecary) ounce ii bottle. the order reads "tetracycline125 mg" how many ml per dose should be prepared?_______

how many doses will be in the bottle?________





Also The physician orders Ilosone 11mg/kg/gid. for a child that weighs 33 pounds. how many mg. should each dose contain?

how many mg. will the child recieve in a day?

and finally....

the physician orders phenobarbitol 1.2 mg/20 of body weight bid. the client weighs 44 lbs. how many mg. will each dose contain?______

how many mg. will the client recieve in a day?_________

[lil' girl]

Okay for the first question, did you write it right? Because if you are going to give 125mg why would you give ml?? Is this a trick question?? As for the second part, 1.5 g is equal to 1500 mg, so the bottle would hold 12 doses if you are giving it in mg.

#2 First divide 33 by 2.2 to get kg, which would be 15. So if you are giving 11mg/kg the proportion would go, 11mg/1kg : xmg/15kg , 1x:165 (1times x =1x and 11 times 15 = 165) divided by 1 would equal 165mg per dose. Now qid of course means 4 time per day so multiply 165 times 4 to get 660mg per day or in a 24 hr period.

#3 Do your proportion again (I am assuming that is 20lbs since you didn't put it)anyhoo 20lbs/1.2mg : 44lbs/xmg which would be 52.8/20 = 2.6mg and bid is twice a day so it would be 5.2mg per day

HOpe this helps

[Fun2Care]

I'm not sure if it will help anymore than what your book shows, but I found this website about dosage calculations:

http://www.unc.edu/~bangel/quiz/quiz5.htm


I feel for you all, and I'll be there soon..lol I actually took a Health Math class 13 years ago...did POORLY on it. Of course, with every class I'm retaking now, I am doing great....maturity and dedication helps! lol (At least I remember the names of things...gtt, minums, etc....but don't ask about calculations.LOL)

(I wish I could take that Health math off my transcript, but it would take too many other classes off my transcript by utilizing the 10 year fresh start option we are offered.) ugggghhhh

Anyway, hope that link helps someone!! GOOOOOD luck!!

[Nrs_angie]

Originally Posted by lpnlpn

i am having trouble converting between systems of measurement, i am trying to teach myself the conversion factor method as well as the ratio proportion method but this problem is giving me a bit of a problem the problem is ---3g=gr_____ help!

Hello,
I can teach you both ways. Proportions are bullcrap. They take too much time. Alot of times you can simply figure it out in your head if you know what the conversion is. But if your school is making you do proportions... this is how you do it. conversion is simple if you know the measurements...
You should know by now that 1 gram = 15-16 grains cuz grains are not exact. 15 is an easier number to work with... so if you have 3 grams then you have 45 grains. Just multiply.

Now here is how you do proportion: they waste your time... but sometime useful if you are just learning or have a complicated measurement.

this is just one example: if you want another one, let me know. Hope it helps.

1 g (gram) = (grains) gr 15 *grains is always written before the value
so whenever you set up a proportion you do it like this
1 g : 15 gr :: 3 g : x gr *you can put grains after the number to keep it simple
so this is how you read a proportion
1 gram is to 15 grains as 3 grams is to x number of grains
now you multiple the outside numbers first
then you multiple the inside numbers second
so
1x = 45
then divide to solve for x
so
x = 45 / 1
x = gr 45 * remember gr goes before the number in the final answer.
hope that makes sense.

[Nrs_angie]

Originally Posted by mandykal

Im doing Pharm now and I did come across something that needed rounding and I couldn't figure out when to round. Thanks for the info...

Here's one that I just did:

Order: Ampicllin 500mg IM q.6h

On hand 1g...instructions: add 3.5mL diuent



500(D)
1000(H) times 3.5mL(Q) = 1.75 mL rounded to 2mL

Hello,
I read your post and I am pretty sure that you should not round that up.
You should keep your final answer at 1.75 mL. Because, if you are going to use a 3 mL syringe then you can easily draw up 1.75. It has a 1.5 marking and a 2 ml marking with .10 mL increments. So you would just draw up half way between 1.7 and 1.8 marking.
I'ts not much of a difference, but when you are dealing with cardiac drugs or drugs for peds... that much could make a hell of alot of difference.
How we were taught to round up is when doing IV drip rates... cuz obviously you cant have 31.1 drips... hehehe. You have to round that to 31 drips.
Here is one time that you can round up...
phenobarbital 70 mg SQ q8 h ( supplied in a 1-ml ampule containing 65 mg)
70 mg
65 mg x 1 mL = 14/13 when you divide it out it comes to 1.07
you could not draw that up with one 3 mL syringe... so you would round that to 1.1 which you could draw up on a 3 ml syrninge.
I hope this helps you.

[Nrs_angie]

Originally Posted by EDRNMass

Is there an easy way to figure out the rounding? I understand that an IV pump only understands ml/hour.

I understand heparing and ? you don't round.

But some problems they have us rounding to the whole number and some are to the tenths place.

Is there an easy way to remember which we round and which we don't?

This part frustrates me. I believe on our test it's going to say round to whatever place. But how about in real life.

Hello,
Usually you round when doing mL/Hr to nearest whole one's. Cuz you couldnt program a pump to do 125.2 ml/hr so it would have to be 125 ml/Hr.
And when you are doing gtt/min you have to round that to the nearest ones place cuz you cant have 31.5 drops... you have to round to 32 drops.

As for injections... read the post by lil' girl... she stated corrected.
Here is an example... if you need 0.449 round that to the nearest hundreths. 0.45 ( it is less than 1 mL and you can use an insulin syringe to draw it up)
if it is. If it is more than 1 mL... round to the nearest tenths. so 2.45 would round to 2.5 mL.

Hope that helps for you

[Megs7617]

Hi everyone,

I am still working on learning my equivalencies (sp?) and I came across this website, it was really helpful to me because it has a conversions calculator so maybe it can help some other people out!

http://www.infoplease.com/ipa/A0001729.html

[Daytonite]

http://www.manuelsweb.com/nrs_calculators.htm - You can double check your pencil on paper drug calculations with this handy tool! These are on-line working calculators to solve nursing math problems with formulas and examples included to show you how each calculator works. You can work problems for oral and IV medications. You can also download these calculators to your pocket PC for free from this site http://www.manuelsweb.com/nrs_download.htm

[nurstobe]

here is how I did those problems: remember to change 8 mg to mcg
8 mcg x 60 min. x 250 ml comes to: 480/8000 mcg =.06 x 250 ml = 15 ml
8000 mcg
then divide by 60 drop x 60 min= 15 gtt/min