Sig code: frequency
TIW medical abbreviation
TIW means "three times a week".
On the ISMP List of Error-Prone Abbreviations. ISMP suggests: Write "3 times weekly".
Each meaning matched at least two public references (2 in all for TIW), checked October 23, 2026. The table lists them.
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What TIW means
| Meaning | Latin origin | Where used | Checked against |
|---|---|---|---|
| three times a week | None | Prescriptions, Medication labels |
Also written: t.i.w.
Example
Training example of an error-prone entry: "TIW" on a label.
A made-up line that shows the abbreviation in place. It is not about any patient and is not an instruction.
Related abbreviations
Elsewhere on Rivvi
Questions
What does TIW mean in medical terms?
TIW means "three times a week".
Where is TIW used?
TIW shows up in prescriptions and medication labels. Its category here is sig code: frequency.
Is TIW on the Joint Commission Do Not Use list?
No, but ISMP lists TIW as an error-prone abbreviation. ISMP's suggested practice: Write "3 times weekly".