This is a medical term, which is short for Latin. The full name is as follows:

Qd: Quarks die once a day.

Bid: Both die twice a day.

TID: Third, die three times a day.

Abbreviation hospital

2N,—/12 clock in at noon,12.

Morning, before noon

AC, ante cibum/ before meals, before meals, PC means after meals, and HS means before bed.

DC,-/stop, stop

Well,-/midnight, midnight.

Afternoon, afternoon/afternoon, afternoon

PRN, pro re nata/ as required (long-term doctor's advice)