When a doctor hands you a prescription, you will see abbreviations like OD, BD, TDS, and QID. Understanding these means you take your medicine correctly.
Many prescription abbreviations are derived from Latin — a historical practice from when Latin was the universal language of medicine and science across Europe.
OD = Omne Die (Latin) = Once Daily
If a medicine is prescribed as OD, you must take it once per day — usually at the same time every day.
| Abbreviation | Full Form (Latin) | Meaning |
|---|---|---|
| OD | Omne Die | Once daily |
| BD / BID | Bis in Die | Twice daily |
| TDS / TID | Ter Die Sumendus | Three times daily |
| QID | Quater in Die | Four times daily |
| HS | Hora Somni | At bedtime |
| AC | Ante Cibum | Before meals |
| PC | Post Cibum | After meals |
| SOS | Si Opus Sit | If needed (as required) |
OD also stands for Oculus Dexter = Right Eye (in eye prescriptions). OS = Oculus Sinister = Left Eye.
Take it at the same time every day — morning is most common. Always follow specific instructions on the prescription (some medicines are better taken at night, like certain cholesterol medications).
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