Safety
Frequency

qd

Once daily

High risk

Risk

Can be mistaken for "qid" (four times daily)

Safer Alternative

Write "daily"

Example

qd misread as qid

Sources

https://online.ecri.org/hubfs/ISMP/Resources/ISMP_ErrorProneAbbreviation_List.pdf
https://www.jointcommission.org/en-us/knowledge-library/support-center/standards-interpretation/standards-faqs/000001457