How many days should you take Fulvestrant?

Fulvestrant (Fulvestrant) is a drug used to treat estrogen receptor-positive (ER+) breast cancer. Its dosage and usage are adjusted based on clinical conditions and physician guidance. It is usually administered by intramuscular injection. During the initial treatment phase, the recommended dosage of fulvestrant is 500 mg, once every two weeks for three consecutive times. This means patients will receive three intramuscular injections of 500mg each in the first six weeks; after completing initial treatment, the recommended dose of fulvestrant is 500mg every four weeks. The goal of this phase is to maintain stable levels of the drug in the body to continue inhibiting estrogen receptor activity.