# Help Med Calculation Test Tomorrow at work

- 0Aug 12, '12 by blynn9173Hi. 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

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- 0Aug 12, '12 by ENicuRNHere 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

Then do your standard calculations:

(1mL/ 0.4mg) X ( 0.3mg/1dose)= 0.75mL per dose - 0Aug 12, '12 by blynn9173Ok 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)

thanks in advance - 0Aug 12, '12 by ENicuRNQuote from blynn9173mL/hour= (250mL/400mg) X (1mg/1,000 mcg) X (250mcg / 1minute) X (60minutes / 1 hour) = 9.375mL/hourOk 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)

thanks in advance

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) - 0Aug 12, '12 by eleectrosaurus*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