T.I.D. (abbr. Latin ter in die, three times a day) in a "hospital or healthcare setting" usually refers to medication administered three times during the day or waking hours (usually in equal duration of time spans). For example, 6am, 2pm, 10pm. The alternate would be Q8H (every eight hours), which would then be medication administered around the clock, every eight hours - no matter what time of day/night. The latter helps keep blood levels of medication more consistent in the body.
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