Which abbreviation indicates a frequency of taking medication four times a day?

The abbreviation that indicates a frequency of taking medication four times a day is "QID." This stands for the Latin term "quater in die," which directly translates to "four times a day." This signifies that a patient should take their medication at evenly spaced intervals throughout the day, typically every six hours, to maintain a consistent level of the medication in their system.

Other abbreviations have different meanings. For instance, "qhs" refers to taking medication at bedtime, which does not translate to multiple doses throughout the day. "q2h" indicates taking medication every two hours, resulting in significantly more doses within a 24-hour period than "QID." "Rx" is a general symbol for a prescription and does not denote a specific dosing frequency. Understanding these distinctions helps ensure proper medication administration and adherence.