tid means three times a day in medical terms. tid is a Latin abbreviation for “three times a day”, and when a nurse sees tid, she knows that the doctor is giving a certain treatment or therapy to the patient three times a day, so the nurse will When the nurse sees the tid, he or she knows that the doctor wants to give a certain treatment or therapy to the patient three times a day. In fact, in clinical work, besides tid, there are many other foreign abbreviations that describe the number of times, time, method, site and route of administration, such as qd is once daily, bid is twice daily, qod is every other day, q4h is every 4 hours, q8h is every 8 hours; po is oral, ivgtt is intravenous drip, etc.