Math question

  1. I can't figure this out..

    Ordered: Codeine gr 3/4 po q4h prn for pain
    Available: Codeine 30 mg tablets

    the answer is: 2.5 tablets

    I don't get it..
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  2. 7 Comments

  3. by   Daytonite
    Neither do I. I come up with 1.5 tablets. The conversion factor is 1 grain = 60 or 65mg, whichever you want to use. The answer in your book might just be wrong.
  4. by   mak0076
    1 gr = 60mg
    3/4gr = 3/4 *60= 45mg

    codeine available = 30mg
    therefore, 30 + 15 = 45mg
    1tab + 0.5 Tab = 1.5
  5. by   NaomieRN
    I came up with 1.5
    1 gr=60-65 mg

    3/4 gr=45 mg
    d/h x Q=amount to give
    45/30=1.5 tablets
    Last edit by NaomieRN on Oct 17, '06
  6. by   muffie
    are meds actually still ordered in this archaic way?
    i haven't seen this since college 20 years ago!
  7. by   traumaQN
    I figured it out.. Our teacher made an error.. instead of gr 3/4= 45 mg.. she had it at 75.. so it knocked the whole question off.

    Thanks for all the input..

    I passed my test this morning.. woo-hoo!
  8. by   allthingsbright
    Yeah-congrats! Glad she fixed it--I also got 1.5 before reading other posts...
  9. by   NaomieRN
    Quote from RNgrad2008
    I figured it out.. Our teacher made an error.. instead of gr 3/4= 45 mg.. she had it at 75.. so it knocked the whole question off.

    Thanks for all the input..

    I passed my test this morning.. woo-hoo!
    No one in the class was able to pick up the error?

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