Safety
Frequency

Q.D.

Once daily

High risk

Risk

Period after Q can be mistaken for "I", reading as QID

Safer Alternative

Write "daily"

Example

Q.D. 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