# Help Med Calculation Test Tomorrow at work

1. Hi. I have to pass this med calculation test before I can pass meds. I cannot figure out how to work this problem out. I hope some one here can help me.

Have: Atropine Sulfate 0.4 mg per mL
RX: Atropine gr 1/200 sq

How many ML's do you give?
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Joined: Feb '07; Posts: 316; Likes: 47
Registered Nurse; from US

3. Here is my fine print: I'm a new graduate RN and have done maybe only 5 grain to grams/mg medication calculation questions. So please have another person double check this!!

Ok so this is what I got:
a few websites said 1grain= 60mg
And I am assuming that the sq at the end of the atropine is implying that it is 1/200 grain per mL

So with these assumptions:
60mg X 1/200grain= 0.3mg

(1mL/ 0.4mg) X ( 0.3mg/1dose)= 0.75mL per dose
4. thanks alot. That is the answer. I just wasn't sure how to come up with that answer. Thanks a million.
5. ENicuRN's post is correct. However, it is important to note that several sources use 65 mg per grain, so you might have to work your problem both ways. Good luck with your test.
6. I did see a lot of websites saying a grain was anywhere from 60-65mg so it definitely depends on who you are referencing.
I'm glad another person was able to double check that.:-)
Good luck tomorrow!
7. Ok can any of you help me with this problem. I am about to pull my hair out. I have been out of school for two years and I am rusty on these drip problems please help. Here is the problem: Dopamine 250 mcg/min. Concentration is 400 mg dopamine in 250 ml D5W. Need to know the ML/Hr.

(Drip factor is 60 gtts/mL)

8. Quote from blynn9173
Ok can any of you help me with this problem. I am about to pull my hair out. I have been out of school for two years and I am rusty on these drip problems please help. Here is the problem: Dopamine 250 mcg/min. Concentration is 400 mg dopamine in 250 ml D5W. Need to know the ML/Hr.

(Drip factor is 60 gtts/mL)

mL/hour= (250mL/400mg) X (1mg/1,000 mcg) X (250mcg / 1minute) X (60minutes / 1 hour) = 9.375mL/hour

Look through the question and always start with whatever you are looking for. This question is asking for mL per hour so you start with the mL part at the first numerator. Then you just cancel out each fraction by making sure if there is a mg on the denominator there is a mg in a numerator somewhere in the equation ( it doesn't have to be directly next to each other, as long as it is in the equation)
9. Thanks ENicuRN.
10. *EDIT, oops, beat to the punch

mgs per mL
400mg/250ml = 1.6mg/ml

convert to mcg
1.6mg = 1600mcg

mls per minute
250mcg/1600mcg = 0.15625 ml/min

mls per hour
0.15625x60 = 9.375 ml/hr