Once daily vs Once a day

Both 'once daily' and 'once a day' are correct and commonly used phrases in English. They are interchangeable and can be used to describe something that happens or is done once per day.

Last updated: April 03, 2024 • 590 views

This phrase is correct and commonly used in English.

"Once daily"

This phrase is used to describe something that happens or is done once per day. It is commonly seen in medical instructions or product labels.

Examples:

The medication should be taken once daily.
The cream is to be applied once daily.
The newsletter is sent out once daily.
The vitamins are recommended to be taken once daily.
The exercise routine should be done once daily.

Show examples from the web [+]

Once daily dosing (300 mg once a day): a clinical study has demonstrated the non inferiority between Epivir once a day and Epivir twice a day containing regimens.
Marie, Pachelbel, once daily.
Once daily dosing with 150 mg produced trough and mean 24 hour responses similar to twice daily dosing on the same total dose.
Usually the dose is administered once daily.
The recommended dosage is 10 mg once daily.
Usually 4 mg doxazosin once daily.
One tablet should be taken once daily.
For best results dermatologists recommend applying the cream or gel once daily before bedtime after washing the face with a mild cleanser.
Commonly use dose of Zyloprin is 200 to 300 milligrams taken once daily.
Cyclobenzaprine is usually taken once daily for only 2 or 3 weeks.
Take citric acid with meals. Do Lugol's-turmeric enema once daily.
To treat rheumatoid arthritis and ankylosing spondylitis take 90 mg once daily.
Adults: the recommended dosage of Zeffix is 100 mg once daily.
Long term data with abacavir used as a once daily regimen (beyond 48 weeks) are currently limited.
30 mg once daily for four weeks.
If the treatment fails the dose 30 mg once daily should be used.
The recommended dosage is 10 mg once daily.
Osteoarthritis The recommended dose is 30 mg once daily.
Rheumatoid arthritis The recommended dose is 90 mg once daily.
Acute gouty arthritis The recommended dose is 120 mg once daily.

Alternatives:

once a day
daily
every day
per day
each day

This phrase is correct and commonly used in English.

"Once a day"

This phrase is used to describe something that happens or is done once per day. It is interchangeable with 'once daily' and can be used in various contexts.

Examples:

The medication should be taken once a day.
The cream is to be applied once a day.
The newsletter is sent out once a day.
The vitamins are recommended to be taken once a day.
The exercise routine should be done once a day.

Alternatives:

once daily
daily
every day
per day
each day

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Once daily vs Once a day

"Once daily"

"Once a day"

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