The QOD medical abbreviation means every other day, so a dose is given one day, skipped the next, and given again the day after. It is usually traced to the Latin quaque altera die, and it has been written QOD, qod, q.o.d. and q.o.d without the final period.
Here is the catch. QOD is on The Joint Commission's official do-not-use list, which means accredited hospitals should not write it in orders or records. The trouble is that the letter O is easy to misread, turning every other day into once daily or four times daily. You will still see it in older records and on some handwritten notes, so it pays to understand it, and to know the safer words that replace it.
At a glance
Stands for
Every other day (alternate days)Latin origin
Usually given as quaque altera dieWritten as
QOD, qod, q.o.d., q.o.d, QODSafety status
On The Joint Commission do-not-use listSafer to write
Every other dayDo not confuse with
Doses per week
Three or four, alternating
What the QOD medical abbreviation means
QOD sets a rhythm of one dose every 48 hours, or one dose every second calendar day. In a typical week that gives three doses one week and four the next, because seven is an odd number. Dose and route are separate parts of the order.
Alternate day schedules are used for a handful of medicines where a daily dose would be more than needed, or where a rest day lowers side effects. Some steroid tapers and some supplements are examples. Whatever the medicine, the pattern is what QOD encodes: on, off, on, off.
Why q.o.d. medical abbreviation forms were banned
The Joint Commission keeps a short official list of abbreviations that hospitals and clinics it accredits must not use. QOD is on it, together with its cousin QD. The problem is visual. A period after the Q can look like an O, and a sloppy O can look like an I.
| What was meant | Misread as | Effect over two days |
|---|---|---|
| QOD, every other day | QD, daily | 2 doses instead of 1 |
| QOD, every other day | QID, four times a day | 8 doses instead of 1 |
The approved fix is to write every other day in words. Electronic ordering systems usually print the phrase in full, and many will not accept QOD at all.
Reading an old every other day order
From an older medication list: "Prednisone 10 mg PO QOD x 2 weeks." Read left to right: the drug is prednisone, the amount is 10 milligrams, PO means by mouth, QOD means every other day, and x 2 weeks gives the length. That works out to seven doses over fourteen days. The line is a format sample only.
If you find QOD on a current label or a handwritten note, it is reasonable to ask the pharmacist to read it back in plain words. A label printed by a pharmacy should say every other day, not the shorthand.
Every other day medical abbreviation versus similar schedules
Several schedules sound close to every other day but are not the same.
- Every 48 hours ties the dose to the clock, which matters in hospitals.
- Three times a week, sometimes written TIW, picks set days such as Monday, Wednesday and Friday, leaving a two day gap at the weekend.
- Daily means every day without a skip.
The medical abbreviation for every other day was QOD, but because of the do-not-use rule, the honest answer today is that there is no approved abbreviation. The phrase is simply written out.
Keeping track of an alternate day medicine at home
Skipping days on purpose makes it easy to lose count. People commonly mark a calendar, use a weekly pill organizer with only the dosing days filled, or set a phone reminder that repeats every two days. Some find even and odd dates easier, though that breaks at the end of a month with 31 days.
If a dose is missed, the right step depends on the medicine. The pharmacist who filled it can explain what to do, and it helps to ask before a missed dose happens.
QOD pharmacy abbreviation notes for students
Pharmacy technician and nursing students study QOD chiefly to spot it on paper and raise a query. When an order arrives with QOD, the usual step is to clarify it with the prescriber and record the schedule as every other day. The same applies to the other entries on the list, such as U for units and trailing zeros after a decimal point.
Every timing and route abbreviation we cover is grouped on the prescription abbreviations page, alongside safe forms like BID.
This is an explanation of an abbreviation, not a dosing plan. The schedule for any medicine you take is set by your prescriber, and your pharmacist can confirm it.
Frequently asked questions
What does QOD mean on a prescription?
QOD means every other day, so the medicine is taken on alternate days. Since The Joint Commission bars it, a modern label should say every other day in words instead.
What is the medical abbreviation for every other day?
The traditional abbreviation is QOD or q.o.d. It is no longer considered safe, so the recommended practice is to write every other day in full.
Why was QOD banned from hospital orders?
It is easily misread as QD, meaning daily, or QID, meaning four times a day. Either mistake could mean a person gets far more medicine than intended.
Is QOD the same as every 48 hours?
Close, but not exactly. Every other day follows the calendar, while every 48 hours follows the clock, which matters for hospital timing. A prescriber who needs strict spacing will usually write the hours.
What is the QOD medical abbreviation meaning in an old chart?
In older records QOD simply meant every other day. When you see it, read it as alternate days, and if it appears on anything current, ask for it to be confirmed in plain words.
How many times a week is every other day?
It alternates between three and four doses a week, because a week has an odd number of days. Over two weeks that adds up to seven doses.