Medically speaking, TID is a medical term that means three times a day medication. Doctors will write tid when they write a medical prescription or prescription medication for a patient, and the three times a day medication can be given orally, topically or by injection. The principle of Tid administration is to give the drug every eight hours. Therefore, the first dose of TID is usually given in the morning at about 8:00 a.m., the second at about 16:00 p.m., and the third at about 24:00 p.m. Tid states both the time of day and the number of times the drug is to be given. To facilitate simple identification of the number of doses by healthcare professionals in the clinic, qd is used to indicate once a day, bid to indicate twice a day, tid to indicate three times a day, qod to indicate every other day, qw to indicate once a week, and tiw to indicate three times a week. Both healthcare professionals and patients need to strictly follow the instructions to execute the medication, and should not change the time and number of times of medication in the process of medication, otherwise it will affect the effect of the medication.