O.D. is the medical abbreviation for right eye. O.S. is the medical abbreviation for left eye and O.U. is the medical abbreviation for both eyes. O.D. is the medical abbreviation for right eye. O.S. is the medical abbreviation for left eye and O.U. is the medical abbreviation for both eyes.
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"Od" can stand for 'overdose". Alternatively, having "od" written after a dosage can mean "four times daily" (this is usually an abbreviation written in clinical notes, not on the patient's label on the bottle/packet for prescribed drugs, to prevent confusion) - in the same way that "bd" means "twice daily".