I need help on a math problem!! Not making sense to me

  1. Aspirin is available in 5 grain tablet. The physician orders aspirin 300mg. How many tablets would you give?
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  2. Visit Katieexi3 profile page

    About Katieexi3

    Joined: Mar '18; Posts: 2; Likes: 2
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    22 Comments

  3. by   RNNPICU
    You will first need to figure out the conversion from grain to mg, then you can do the problem. Show us the work that you have, take stab and then we can correct any mistake
  4. by   Katieexi3
    Well 5 grain is equal to 323.995mg. That's where I am stuck. You can't give a fraction of a tablet lol
  5. by   AJJKRN
    Here...a quick internet search found this link and many others but I hope this helps...

    http://www.germanna.edu/wp-content/u...August2012.pdf
  6. by   QuietIsntAWord
    Call the doctor for an easier order? lol I'm just kidding
  7. by   klone
    Quote from QuietIsntAWord
    Call the doctor for an easier order? lol I'm just kidding
    Yes, that would be the real world answer. That, or ask pharmacy WTF they're stocking medications in grains, unless they're actually an old timey apothecary.
  8. by   soutthpaw
    I asked about this to my professor and the answer was round up to the common dose. ASA 325mg. also a grain is actually 64.7989mg yet you will see it listed as 60, or 65mg for calculation purposes so it's an old and not very accurate measurement unless the drug is provided in grains.
  9. by   ruby_jane
    Quote from klone
    Yes, that would be the real world answer. That, or ask pharmacy WTF they're stocking medications in grains, unless they're actually an old timey apothecary.
    Oh man, I do not miss dosage calculations. But Klone is spot on...
  10. by   BeckyESRN
    Ugh, just reading this made me cringe! We had one ancient doc that ordered EVERYTHING in grains. He would refuse to change the orders and said that "real doctors only use grains". He and pharmacy butted-heads daily. SMH. He should have been retired many, many years earlier, but was finally forced to retire when he ran over a sign in the parking lot, parked on the grass, and was pants-less...dementia is a beast...
  11. by   bjwojcik
    Grains need to go away like minims and scruples.
  12. by   fibroblast
    Quote from Katieexi3
    Aspirin is available in 5 grain tablet. The physician orders aspirin 300mg. How many tablets would you give?
    The way I learned it:

    1gr= 60mg or 65mg

    so..

    A) i (1/2) grain = 30 mg or 32.5mg
    (60 x 1/2 = 30, 65 x 1/2 = 32.5)

    B) V (5) grains = 300mg, or 325mg
    (60 x 5 = 300mg, 65 x 5 = 325mg)


    C) X (10) grains = 600mg or 650mg
    (60 x 10 = 600mg, 65x10 = 650mg)


    know your roman numerals. i, V, X..That is where you can get thrown off..grain questions are used with aspirin and tylenol alot, notice that tylenol usually comes in 325mg or 650mg tablets. Often they are 1 or 2 tablets. In your case, I believe the answer is 1 tablet (i.e. one 5 gr tablet is 300mg)
    Last edit by fibroblast on Mar 8
  13. by   nursej22
    I miss grains, a little. We used to use it for ASA gr X, APAP gr X, pentobarbital gr V (I think) , and nitro gr 1/150.

    Dang, i'm old!
    Last edit by nursej22 on Mar 8
  14. by   Have Nurse
    Write it out:

    Convert grains to milligrams first. 5 Grains = 325 Milligrams.
    Milligrams to Grains conversion
    (This link can help you with some conversions.)

    So, now we write the problem out. I am doing it the long way, to prevent error.

    Remember that the 1st and 3rd units of measurement in this equation have to match.

    300 m.g. : X tabs :: 325 m.g. : 1 tab

    (So now we drop the symbols. Remember, what ever you do to one side of the equation, you must do to the other. We are solving for X.)

    300 : X :: 325 : 1.

    Multiply your means first, then your extremes:

    X times 325 = 325X Underline that, and to the right of that, multiply 300 X 1

    So 325X = 300. Now divide both numbers by 325, because that is the number next to X and we are solving for X.

    We need to get X by itself.

    After you do that, divide the 300 by 325 = 0.93 tabs. So unless the Pharmacy can chop it up for you, you will end up giving a whole tab. Hope I haven't confused you further!

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