p.r.n. represents which concept?

p.r.n. represents which concept?

• A. PRN
• B. Pulse rate normal
• C. When necessary
• D. Postrenal nephritis

Answer: (C)

p.r.n. comes from Latin pro re nata and means "as needed" or "when necessary." It tells you to give the medication only in response to symptoms or a specific need, not on a fixed schedule. For example, a pain reliever prescribed PRN is taken when pain occurs, rather than every few hours regardless of pain. This differs from scheduled dosing where meds are given at set times. The other ideas (referring to a normal pulse rate or a disease name) don’t describe how a drug is to be administered, so they aren’t the correct interpretation.

p.r.n. comes from Latin pro re nata and means "as needed" or "when necessary." It tells you to give the medication only in response to symptoms or a specific need, not on a fixed schedule. For example, a pain reliever prescribed PRN is taken when pain occurs, rather than every few hours regardless of pain. This differs from scheduled dosing where meds are given at set times. The other ideas (referring to a normal pulse rate or a disease name) don’t describe how a drug is to be administered, so they aren’t the correct interpretation.