Sig code: frequency
QN medical abbreviation
QN means "every night".
On the ISMP List of Error-Prone Abbreviations. ISMP suggests: Write "nightly" or "at bedtime".
Each meaning matched at least two public references (3 in all for QN), checked October 23, 2026. The table lists them.
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What QN means
| Meaning | Latin origin | Where used | Checked against |
|---|---|---|---|
| every night | None | Prescriptions, Medication labels |
Also written: Qn, qn.
Example
Training example of an error-prone entry: "qn" on an order.
A made-up line that shows the abbreviation in place. It is not about any patient and is not an instruction.
Related abbreviations
Elsewhere on Rivvi
Questions
What does QN mean in medical terms?
QN means "every night".
Where is QN used?
QN shows up in prescriptions and medication labels. Its category here is sig code: frequency.
Is QN on the Joint Commission Do Not Use list?
No, but ISMP lists QN as an error-prone abbreviation. ISMP's suggested practice: Write "nightly" or "at bedtime".