What does Q6H mean on a prescription?
Q6H means every six hours around the clock — four doses in 24 hours, including one overnight unless the order says otherwise.
- Means:
- every 6 hours
- From:
- quaque 6 hora
- Type:
- How often
- Also written:
- q6h, q6°, Q6H, q 6 h
What it means in practice
Q6H keeps a drug at a steady concentration by spacing doses evenly through the full day. It is the round-the-clock equivalent of QID, which fits four doses into waking hours instead.
Example on a prescription
Cefalexin 500 mg PO Q6H x 7 days
Take one 500 mg cefalexin capsule by mouth every six hours for seven days — for example 6am, midday, 6pm and midnight.
Commonly confused with
- QIDQID is four times a day while awake. Q6H is strictly every six hours.
- Q8HQ8H is every eight hours, three doses a day.
Frequently asked questions
Does Q6H mean I have to wake up at night?
Strictly interpreted, yes — it is four evenly spaced doses. For many medicines the prescriber is content with waking-hours dosing; ask whether the overnight dose matters for yours.
Is Q6H the same as QID?
They are both four doses a day, but Q6H fixes the interval at six hours while QID lets the doses sit inside your waking day.
Related abbreviations
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This page explains prescription notation for general information. It is not medical advice and does not replace your prescriber or pharmacist. If a label is unclear or differs from what you were told, check with your pharmacy before taking the medicine.