Medical Abbreviation for "Day": d, dy, qd, bid, tid, qid

Day abbreviations:

• d or dy – day (e.g., 7 d supply)
• q.d. or qd – every day (once daily)
• b.i.d. / bid – twice daily
• t.i.d. / tid – three times daily
• q.i.d. / qid – four times daily

Joint Commission "Do Not Use" list: q.d., q.o.d. – write "daily" / "every other day" to prevent errors.