What it means
TID comes from the Latin ter in die. Each facility sets standard times for it, often with meals or at set hours such as 0900, 1300 and 1700. It is not the same as "every 8 hours" (q8h), which spaces doses evenly around the clock, including at night. Three times a week is a different order; ISMP advises writing it out in full rather than abbreviating it.
For the nurse
Give the dose at the facility's set times unless the order says every 8 hours. If an order is unclear about which schedule is meant, clarify it.
At a glance
| Also written | TID, tid |
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Related terms
PRN
As needed: an order for a drug or treatment to be given only when the client needs it, within set limits.