# math problem

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1. 0.25g of liquid Dilantin has been prescribed po by the physician. How many ml should you administer if the Dilantin is available in a strength labeled 125 mg in 1 tsp.

2. You have available an ampule of Atropine Sulfate labeled 1 mg in 1 ml. 1/150 gr of Atropine Sulfate has been prescribed by the physician IM. What volume of drug will you prepare?

Thanks so much

177 Posts

1. 0.25g of liquid Dilantin has been prescribed po by the physician. How many ml should you administer if the Dilantin is available in a strength labeled 125 mg in 1 tsp.

2. You have available an ampule of Atropine Sulfate labeled 1 mg in 1 ml. 1/150 gr of Atropine Sulfate has been prescribed by the physician IM. What volume of drug will you prepare?

Thanks so much

im no nursing student (yet) but i think this may be a conversion problem??

96 Posts

For number one, you need to remember how many mLs are in a tsp. 1 tsp=5 mL

For number two, you have to know how many mgs are in 1/150 gr. gr 1/150=0.4 mg

177 Posts

First you must convert 0.25g to mg by moving the decimal point three places to the right...so 0.25g=250mg.

Then you set up the problem:

125mg = 250mg

1tsp X

You cross multiply and get:

125X = 250

Solve for X:

X= 250

125

X= 2 tsp

So you know that 1 tsp= 5mL, therefore 2 tsp= 10 mL.

Now I realize that this problem could probably be done in your head after figuring out how many mg 0.25g is, but I just set it up to show you how to do the problem.

HTH! :)

177 Posts

First you must convert 0.25g to mg by moving the decimal point three places to the right...so 0.25g=250mg.

Then you set up the problem:

125mg = 250mg

1tsp X

You cross multiply and get:

125X = 250

Solve for X:

X= 250

125

X= 2 tsp

So you know that 1 tsp= 5mL, therefore 2 tsp= 10 mL.

Now I realize that this problem could probably be done in your head after figuring out how many mg 0.25g is, but I just set it up to show you how to do the problem.

HTH! :)

Sorry I had to post twice, some of the numbers got shifted.

177 Posts

Ok, I have no idea why the numbers keep getting moved, but the X is supposed to be under the 250mg in the problem, not next to the tsp

177 Posts

For the second problem, you need to know that 1 grain=60mg. So that means that 1/150th of 1 grain = 0.4mg

(divide 60mg by 150, and you get 0.4mg)

Set up the problem (again, this isn't necessary because the math is very simple, but just to get an idea)

1mg = 0.4mg (1mg is to 1mL, as 0.4mg is to X, so we are looking to solve for X)

1mL X

Solve the problem by cross mulitplying:

1X =0.4

X=0.4mL

I believe that there are a couple of different ways to solve these problems, but this is the easiest way to me.

HTH!

(again, the X is supposed to be under the 0.4mg...not sure why it is getting moved.)

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