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  1. #1
    Join Date
    Aug 2005
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    Interpret Prescription Abbreviations

    Prescription abbreviations:
    A prescription, as is well known, is a physician's order for the preparation and administration of a drug or device for a patient.

    What may be less well known is that a prescription has several parts:

    • The superscription (or heading) with the symbol R or Rx which stands for the word Recipe, meaning (in Latin) to take;
    • The inscription which contains the names and quantities of the ingredients;
    • The subscription or directions for compounding the drug; and
    • The signature which is often preceded by the sign s. standing for signa, mark, giving the directions to be marked on the container.
    • You may see some chickenscrawl marks on a prescription. For example, b.i.d. It means twice (two times) a day and is an abbreviation for "bis in die" which in Latin means, not too surprisingly, twice a day. It is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken.

    Some of the abbreviations of terms commonly used in prescriptions with their meanings are:

    • a.c. = before meals (from "ante cibum," before meals)
    • ad lib: use as much as one desires (from "ad libitum")
    • b.i.d. = twice a day
    • caps = capsules
    • da or daw = dispense as written
    • g (or gm or GM) = gram
    • gtt. = drops (from "guttae," drops)
    • h. = hour
    • mg = milligram
    • ml = milliliter
    • p.c. = after meals (from "post cibum," after meals)
    • p.o. = by mouth, orally (from "per os," by mouth)
    • p.r.n. = when necessary (from "pro re nata," for an occasion that has arisen, as circumstances require, as needed)
    • q.d. = once a day (from "quaque die," once a day)
    • q.i.d. = four times a day (from "quater in die," 4 times a day)
    • q._h.: If a medicine is to be taken every so-many hours (from "quaque," every and the "h" indicating the number of hours)
    • q.h. = every hour
    • q.2h. = every 2 hours
    • q.3h. = every 3 hours
    • q.4h. = every 4 hours
    • t.i.d. = three times a day (from "ter in die," 3 times a day)
    • ut dict. = as directed (from "ut dictum," as directed)
    Last edited by Steve; August 3rd, 2008 at 02:53 PM. Reason: URL correction

  2. #2
    Join Date
    Mar 2004
    Ottawa, Canada
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    Re: Interpret Prescription Abbreviations


    • am = in the morning
    • hs = at bedtime

  3. #3
    Join Date
    Aug 2005
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    Re: Interpret Prescription Abbreviations

    .....and if you encounter an abbreviation you wish to look up easily, Click on Rx Desktop for an easy search reference.

    Enter the abbreviation, and Rx Desktop will give you the Latin as well as practical instruction.



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