Letrozole tablets have no clear requirements for the time of administration, but need to adhere to the regular use of medication; the use of medication to pay attention to adverse reactions and contraindications. Letrozole tablets can be taken before or after eating or during eating, there is no special requirement for the time of taking. Try to take the whole tablet, avoid chewing or crushing. The drug needs to be used regularly for a long period of time, do not increase or decrease the dosage of the drug at will, or use the drug at intervals. Letrozole tablets are estrogen-inhibiting drugs, which can be used as adjuvant treatment for early postmenopausal breast cancer. Serious adverse reactions such as hot flashes (bouts of fever), arthralgia, vaginal bleeding, heart failure, hypertension, myocardial infarction, etc. should be consulted promptly if they occur after taking the drug. Allergy to the product, pregnancy, lactating women are prohibited to use the drug. Letrozole tablets are recommended to be used under the supervision of a clinician.