Medical Abbreviation
OD
OD is a medical abbreviation with more than one meaning — most commonly Once daily / Right eye. Its meaning depends on the clinical context.
What does OD mean?
| Meaning | Context | Field |
|---|---|---|
| Once daily (omni die) | Prescriptions and dosing | Pharmacy / General |
| Right eye (oculus dexter) | Eye examinations and prescriptions | Ophthalmology |
| Overdose | Emergency and toxicology | Emergency medicine |
| Doctor of Optometry | Professional title | Optometry |
Why it matters
Misreading OD can be dangerous. Because "once daily", "right eye" and "overdose" are entirely different, many institutions now discourage OD for once-daily dosing to avoid medication errors.
Frequently asked questions
Does OD mean once daily or right eye?
Both, depending on context. In prescriptions and dosing it usually means once daily; in eye (ophthalmology) notes it means right eye.
Why is OD being phased out?
Because its multiple meanings create a risk of medication errors, many safety guidelines discourage using OD for once-daily dosing.
Related abbreviations
Study reference only — not medical advice. Always consult qualified sources and supervisors for clinical decisions.