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Sheet: Abbreviations

frequency | abbreviation | explanation http://www.cwladis.com/math104/lecture5.php
every day | q.d. | q is used to represent "every" (because the Latin for every is quisque)
 |  | d is used to represent "day" (because the Latin for day is diem)
 |  | We will see these two letters used this way in many of the abbreviations below.
every other day | every other day (q.o.d.) | Notice the use of q for every and d for day.
 |  | This abbreviation is now discouraged, because too often it was mistaken for "every day," so while you may still see it occasionally, you should always write out "every other day" instead of using q.o.d.
every hour | q.h. | Notice the use of q for every.
 |  | h is used to represent "hour"
 |  | We will also see these two letters used this way in many of the abbreviations below.
every 2 hours | q.2.h. | Notice the use of q for every and h for hour. The number of hours in between each dose always goes in the middle.
every 3 hours | q.3.h.
every 4 hours | q.4.h.
etc... | etc...
twice a day | b.i.d | b is used to represent "twice" (because the Latin prefix for 2 is bi - think bicycle)
three times a day | t.i.d | t is used to represent "three times " (because the Latin prefix for 3 is tri - think tricycle)
four times a day | q.i.d | q is used to represent "four times " (because the Latin prefix for 4 is quad- think quadruple )
every morning | q.a.m. | Notice the use of q for every.
 |  | Notice also that we use a.m. to represent morning (for the Latin ante meridiem meaning before noon)
at bedtime | h.s. | This stands for hour of sleep.
every bedtime | q.h.s. | Notice the use of q for every. This literally means "every hour of sleep"
before meals | a.c. | a stands for before (ante is the Latin for before - think of a.m. as in before noon)
 |  | c stands for meals (cibum is the Latin for meals - unfortunately, I can't think of a good memory aid for this one...)
after meals | p.c. | p stands for after (post is the Latin for after - think of p.m. as in after noon)
 |  | c stands for meals (cibum is the Latin for meals)
as desired | ad lib | short for ad libitum, Latin for "at one's pleasure" - in everyday English we often use this term to describe when someone is improvising dialog
as necessary | s.o.s. | short for si opus sit, Latin for "if it is necessary" (actually, it literally says, "if there is work", which in Latin is the phrase used to mean "if it is necessary")
when necessary/required | p.r.n. | short for pro re nata, Latin for "as occasion requires"
as much as required | [NAME] | q stands for quantity (quantum is the Latin for quantity)
 |  | s stands for sufficient (sufficiat is the Latin for sufficient)
 |  | so literally, it means "a sufficient quantity"
immediately | stat | short for statim, which is Latin for "immediately'
with | c | c stands for with (cum is the Latin for with - think of "cum laude", which means "with honor")
before | a | a stands for before (ante is the Latin for before - think of a.m. as in before noon)
after | p | p stands for after (post is the Latin for after - think of p.m. as in after noon)