“The medical term “qw” means “once a week”, which is the frequency of medication administration, and is used to guide patients in the administration of medication or to guide nursing staff in the care of patients. The full spelling of “qw” is “quaque week”, and if a number is added in front of the “w”, such as “q2w”, it means once every 2 weeks, and the specific timing of the medication is directed by the doctor. qw” is commonly used in medical orders, infusion bottles, medication boxes, etc., to prompt health care workers and patients to use the medication correctly in order to bring out the efficacy of the medication. According to the speed of drug absorption, the frequency of “qw” may be used in clinical practice, such as aerosol inhalation, sublingual administration, rectal administration, intramuscular injection, subcutaneous injection, oral administration and skin administration. In addition, the frequency and dosage of drugs should take into account the half-life of the drug, as well as the characteristics of the drug, the physiological rhythm of the human body, and the underlying medical condition, so it is important to follow the doctor’s instructions to avoid affecting the effectiveness of the drug. In addition to “qw”, “bid” for twice a day, “tid” for three times a day, “qid” for four times a day, “qod” for every other day, and “qd” for every day are also used in clinical practice and require a doctor’s prescription as guidance.