HELP HELP

i've tried everything and can't get the right answer.
1)Calculate the number of mL to administer with each dose. Round your answer to the nearest tenth.
Ordered: Trimethobenzamide 125 mg IM q4h prn
On hand: Trimethobenzamide 100mg/mL 20mL MultiDose Vial
I got 25
2) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Ranitidine 45 mg IM now
On hand:Ranitidine 25mg/mL 6mL MultiDose Vial
I got 10.9
3) Calculate the number of mL to administer. Round your answer to the nearest tenth.
Ordered: Octreotide Acetate 220 mcg subq q12h
On hand: Octreotide Acetate 500mcg/mL SingleDose Vial
4) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Trifluoperazine 5 mg IM now
On hand: Trifluoperazine 2 mg/mL SingleDose Vial
5) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Heparin sodium 3000 units deep SubQ q8h
On hand: Heparin sodium 10,000 units/mL SingleDose vial
6) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Medroxyprogesterone 750 mg IM weekly
On hand: Medroxyprogesterone 400 mg/mL SingleDose vial 
May 29, '09i've tried everything and can't get the right answer.
1)Calculate the number of mL to administer with each dose. Round your answer to the nearest tenth.
Ordered: Trimethobenzamide 125 mg IM q4h prn
On hand: Trimethobenzamide 100mg/mL 20mL MultiDose Vial
I got 25
2) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Ranitidine 45 mg IM now
On hand:Ranitidine 25mg/mL 6mL MultiDose Vial
I got 10.9
3) Calculate the number of mL to administer. Round your answer to the nearest tenth.
Ordered: Octreotide Acetate 220 mcg subq q12h
On hand: Octreotide Acetate 500mcg/mL SingleDose Vial
4) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Trifluoperazine 5 mg IM now
On hand: Trifluoperazine 2 mg/mL SingleDose Vial
5) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Heparin sodium 3000 units deep SubQ q8h
On hand: Heparin sodium 10,000 units/mL SingleDose vial
6) Calculate the number of mL to administer for the dose. Round your answer to the nearest tenth.
Ordered: Medroxyprogesterone 750 mg IM weekly
On hand: Medroxyprogesterone 400 mg/mL SingleDose vial 
May 29, '09if we give you the answers, were does that leave you? show your work and see if someone can point out what you are doing wrong...


May 29, '09Quote from morteI agree. You should do all of the questions and show all of your work. You won't learn anything if you keep looking for answers on here. Why don't you create/join a study group with students in your class or ask your professor to help you during free time? Allnurses.com won't be there during your licensing exam! LOLif we give you the answers, were does that leave you? show your work and see if someone can point out what you are doing wrong...


May 29, '09Although I did give the answers, I am in agreement with others. Show your work and someone will surely be able to point out what you're doing wrong. Just knowing the answers isn't good enough. You need to know how to find the answers.
Ordered: Trimethobenzamide 125 mg IM q4h prn
On hand: Trimethobenzamide 100mg/mL 20mL MultiDose Vial
125 mg : X mL :: 100 mg : 1 mL
125 * 1
100 * X
100x = 125
100/x = 125/ 100
125 mg= 1.25 mL Rounded: 1.3ml
Ordered: Ranitidine 45 mg IM now
On hand:Ranitidine 25mg/mL 6mL MultiDose Vial
45 mg: x mL:: 25 mg: 1 mL
45 * 1
25 * X
25X = 45
25/x = 45/25
45 mg = 1.8 mL
Ordered: Octreotide Acetate 220 mcg subq q12h
On hand: Octreotide Acetate 500mcg/mL SingleDose Vial
220 mcg : X mL :: 500 mcg: 1 mL
220 * 1
500 * X
500X = 220
500/X = 220/ 500
220 mcg = 0.44 mL Rounded: 0.4 mL
Ordered: Trifluoperazine 5 mg IM now
On hand: Trifluoperazine 2 mg/mL SingleDose Vial
5 mg : X ml :: 2 mg : 1 mL
5 * 1
2* X
2X = 5
2/ X = 5/ 2
5 mg = 2.5 mL
Ordered: Heparin sodium 3000 units deep SubQ q8h
On hand: Heparin sodium 10,000 units/mL SingleDose vial
3000 units : X mL :: 10000 units : 1 mL
3000 * 1
10000 * X
10000X = 3000
10000/ X = 3000/ 10000
3000 units = 0.3 mL
Ordered: Medroxyprogesterone 750 mg IM weekly
On hand: Medroxyprogesterone 400 mg/mL SingleDose vial
750 mg : X mL :: 400 mg : 1 mL
750 * 1
400 * X
400X = 750
400/ X = 750 / 400
750 mg = 1.875 mL Rounded: 1.9 mLLast edit by melsman1904 on May 29, '09 : Reason: edited to show work 
May 29, '09"Thank you for everything ...you are an angel.! "
Seriously, I'm not trying to be a spoilsport, but I don't know how giving you the answers and not even showing you how they were obtained can be helpful.
You will eventually have to do this for yourself. Every facility I've hired into has required a basic med calc test. It is to your advantage to figure out what you're doing wrong. If you're in nursing school, what will you do on the NCLEX without these skills?
At the very least, can you look at your answers and figure out that they don't make sense? For instance, with (1), your answer of 25 mls of 100mg/ml drug would yield a dose of 2500 mgs. Of course, that's not right.
Sometimes when I would get confused (because I'm arithmetically challenged), it helped me to try to use logic. 
May 29, '09I agree, we would need to know HOW you're getting those answers, if it's actually going to be of help and not just answering them FOR you.
I can see from the first question that, it looks like you took the "20ml multi dose vial" into consideration, and that part of the question is irrelevant. 
May 29, '09:icon_rollQuote from justt139:icon_rollThank you for everything ...you are an angel.!

May 29, '09I think you are using the amount of the ml in the whole vial instead of the medication concentration which is mg/ml
for example
1)Calculate the number of mL to administer with each dose. Round your answer to the nearest tenth.
Ordered: Trimethobenzamide 125 mg IM q4h prn
On hand: Trimethobenzamide 100mg/mL 20mL MultiDose Vial
I got 25
if you use Desired/Have x ML (ml of the doseage concentration not the whole vial) you get the answer
125mg/100mg x 1ml = 1.25ml rounded to nearest tenth=1.3ml
hope it helps 
May 30, '09i have previously suggested that you will get better responses if you post these kinds of questions on the nursing student assistance forum (click the students tab above to get to this forum). one of the moderators has already moved one of your threads to that forum. you will find tutorials on how to work medication math problems on post #2 of this sticky thread: http://allnurses.com/generalnursing...ad264395.html  the nursing math thread

May 30, '09I'll admit I struggled with math in nursing school, and it didn't matter who tried to explain it to me it just made it worse, but with alot of hard work I got proficient at it. Of course I didn't know about allnurses.com at the time......
I'll save you alot of clicking and give you the links to the 2 websites that were the biggest help to me (they are in the link Daytonite posted):
http://www.manuelsweb.com/nrs_calculators.htm
http://www.accd.edu/sac/nursing/math/default.html
Here's a tip, don't be lazy and just plug the problems into the calculators, use the formulas provided, work it out & use the calculators to check your answers
To paraphrase a very dear instructor I had: "MEMORIZE THE FORMULAS DUMMY" :spin: