Since being in the hospital, I've come to be taking all sorts of differnt medacation.
Some of these are perscribed at every 2 hrs, every 3 hrs,
every 6 hrs etc. Ive come to find there is a "Letter" system
to denote to the nurses when to administer each med.
Something like "P-R-N-G" "P-R- - ", etc.

What are these and what do each stand for. ?

Thanks
Mike b. (AKA Byter)

PRN: As Needed

Pro Re Nata, Latin: for the existing occasion; as matters are; as needed

http://www.globalrph.com/abbrev.htm

just to add, since we are on the topic:
QD = every day
QID = four times a day
TID = three times a day
BID = two times a day
qhs = at bed time
AC = before meals

Doctors, especially in hospitals, are now being urged to abandon these Latin abbreviations and to more-or-less fully spell out the instructions. This is in response to many cases of misinterpretations due to illegibility.

For example, in a sloppily-written "qid" the "i" may be mistaken as a period, changing the meaning from 4 times a day to once a day.

JCAHO has suggested removing QID but not the rest.

They have also recommended not using the popular CC instead of mL, and u for units.

But TID, BID, etc have not changed.