Can someone please help me with these two nursing calculations?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?I'm not just looking for answers, but how to go about finding the answer. Thanks so much

vccorscc 177 Posts Jun 6, 2010 Can someone please help me with these two nursing calculations?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?I'm not just looking for answers, but how to go about finding the answer. Thanks so muchim no nursing student (yet) but i think this may be a conversion problem??

knittingmonster 96 Posts Jun 6, 2010 For number one, you need to remember how many mLs are in a tsp. 1 tsp=5 mLFor number two, you have to know how many mgs are in 1/150 gr. gr 1/150=0.4 mg

ohcomeon 177 Posts Jun 6, 2010 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 = 250mg1tsp XYou cross multiply and get:125X = 250Solve for X:X= 250 125X= 2 tspSo 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! :)

ohcomeon 177 Posts Jun 6, 2010 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 = 250mg1tsp XYou cross multiply and get:125X = 250Solve for X:X= 250 125X= 2 tspSo 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.

ohcomeon 177 Posts Jun 6, 2010 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

ohcomeon 177 Posts Jun 6, 2010 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 XSolve the problem by cross mulitplying:1X =0.4X=0.4mLI 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.)