I have eaten dry mixes that were 12 years past the expiration date, canned food that was 6 years past and kept eggs for 6 months without refrigeration. Handled and stored properly they say eggs will last over a year entirely without refrigeration. I have encountered canned food that was bad.
Word Origin & History. regimen mid-15c., act of governing, from O.Fr. regimen (14c.), from L. regimen rule, guidance, government, from regere to rule (see regal). Medical sense of course of diet, exercise, etc. for sake of health first recorded late 15c.
Definition. PRN is an abbreviation that comes from the Latin term pro re nata.. Its actual translation to English is for the thing born, but its common medical meaning is as needed.. It used to identify a medication that can be taken as the patient needs it rather than on a fixed schedule.he most common types of PRN medications are those that treat occasional conditions. These include drugs to control pain, sleeping pills, anticongestants, cough medicine and medications that treat occasional stomach distress.