The side effects of taking Letrozole will slowly disappear after stopping the medication, which varies from person to person. Letrozole tablets are highly selective non-steroidal aromatase inhibitors, which can reduce the level of estrogen in the body and eliminate the stimulating effect of estrogen on tumor growth, and are used clinically to treat patients with advanced postmenopausal breast cancer. Letrozole adverse effects are generally mild and moderate, such as nausea, headache, bone pain, hot flashes, weight gain, rare abdominal pain, diarrhea, constipation, itching, rash and other symptoms, each patient’s physical condition is different, and the adverse effects of the drug after the use of the drug are also different. Letrozole treatment after the adverse reactions, generally in the discontinuation of the drug side effects will slowly disappear, appear to have severe adverse reactions, to stop taking the drug. It is recommended to take Letrozole under the guidance of a doctor, and to stop taking the drug in time if you feel unwell after taking it.