Dosage question ;)

0 For some reason I just cannot grasp the whole grains concept.... Can anyone help with this question? Order: atrophine sulfate gr 1/300 sc statSupply: atrophine sulfate 0.4 mg per mLGive: ? mL



Dec 5, '12 by NursieNurseLPNOr try it the long way this always helped me to understand the concept & double check my answers. 1 grain = 6065mg, you use whichever comes out with the even number usually. Unless instructed otherwise

Dec 5, '12 by NursieNurseLPNAnswer i believe would be 2ml. You use 1gr is to 60mg. So if it says 1/300 you would divide 60into 300 which equals 0.2. So 0.4mg is to x ml as 0.2 is to 1ml. 0.2x=0.4, 0.4 divided by 0.2 equals 2. I BELIEVE! But i did that in my head without double checking it so you definately should! Lol good luck

Dec 6, '12 by KikikinsQuote from KkccsrThis is the way I did it... I just passed my Pharmacology Mathematics exam last week 100%.For some reason I just cannot grasp the whole grains concept.... Can anyone help with this question? Order: atrophine sulfate gr 1/300 sc statSupply: atrophine sulfate 0.4 mg per mLGive: ? mL
Atropine is a gr 1 = 60mg (the 64.8 standard has been phased out it seems and gr 1 = 65mg only applies to Acetaminophen and Iron  as per my instructor).
gr 1/300 = 0.00333 x 60mg = 0.2mg
Using Order / Available (aka Desired / Have)...
0.2mg / 0.4mg x 1ml = 0.5ml
Answer = 0.5ml 
Dec 6, '12 by NursieNurseLPNLol yes^^^^^. See that why you dont do it in your head!! Ive always mad that mistake x2 or divided by 2. Sorry!! : )

Dec 6, '12 by ADN2B1/300grain x 60mg/1grain= 0.2mg because 1/300=0.003grains which will be multiplied by 60 mg to get 0.2mg
0.2mg x 1mL/0.4mg= 0.5mL 
Dec 6, '12 by pookypI start school for the first time next week and looking at this is like reading German. I'm terrified of math and this thread didn't help. Lol hopefully i have a good instructor that will make it easy.

Dec 7, '12 by KikikinsPookyP  there's a great video for drug dosages from Khan Academy, they don't have much yet but it's a solid start.
http://www.khanacademy.org/math/alge...edrugdosage
Also if anyone needs PN math help just message me. 
Dec 7, '12 by pookypQuote from KikikinsLove khan academy. Thanks! I hope there are more videos to come.PookyP  there's a great video for drug dosages from Khan Academy, they don't have much yet but it's a solid start.
http://www.khanacademy.org/math/alge...edrugdosage
Also if anyone needs PN math help just message me.