In dosing prostaglandin analogs, which statement about QHS, QAM, and QD is true?

• A. QHS denotes dosing at noon
• B. QHS, QAM, and QD all denote once-daily dosing
• C. QAM denotes dosing at bedtime
• D. QD denotes dosing every other day

Answer: (B)

Dosing abbreviations tell you how often a medication is taken each day. In prostaglandin analogs, all three of these terms indicate a single daily dose, differing only by the time of day.

QD means dosing once per day, every day. QHS means dosing every night at bedtime. QAM means dosing every morning. So, despite the different times, each option reflects once-daily dosing, which is why the statement is true.

To clarify what each timing would imply if interpreted incorrectly: dosing at noon isn’t tied to QHS, which is tailored to bedtime. Dosing in the morning is QAM, not bedtime. And every other day would be QOD, not QD.