For a patient on a regimen requiring medications to be taken every two hours, which abbreviation would be appropriate?

The appropriate abbreviation for a medication regimen that requires doses to be administered every two hours is "Q2h." This abbreviation specifically indicates that a dose is to be given every two hours, which is crucial for clear communication in healthcare settings.

Using "QH" refers to every hour, which does not align with the specified two-hour interval. "PC" stands for "post cibum," meaning after meals, which does not relate to timing between doses. Lastly, "QD" stands for "quaque die," meaning once daily, which does not fit the requirement for medication administration every two hours. Therefore, "Q2h" is the correct and specific choice for indicating a two-hour medication schedule.