How long does hormone therapy take to work for ductal carcinoma in situ?

DCIS is abnormal cells contained within a breast duct. If testing shows hormone receptors, a hormone medicine may be offered after local treatment to reduce the hormone signal available to sensitive cells. It does not act like a painkiller, and it is not expected to make a treated area disappear immediately. Follow-up breast examinations and imaging are used to monitor the treated breast and the other breast.

The exact benefit and duration depend on your receptor result, age, other health conditions, and the surgery or radiotherapy already discussed. Your team may review tolerance early and assess the longer-term plan at later appointments.

Take each dose as prescribed and keep the follow-up appointments arranged by your breast team. Report troublesome joint aches, hot flushes, mood changes, or vaginal symptoms rather than silently stopping the medicine; alternatives or supportive measures may be discussed. Keep track of breast changes and the dates of mammograms or other imaging. Read more about the treatment in [Hormone Therapy for Cancer](/treatments/systemic-therapy/hormone-therapy-for-cancer/).

Contact your breast team about a new breast lump, nipple discharge, skin change, persistent focal pain, or a side effect that makes daily activities difficult. Seek urgent help for chest pain, sudden breathlessness, fainting, or sudden one-sided weakness. These concerns should be assessed promptly and are not judged by whether the medicine has had time to work.

Ask whether your DCIS contains hormone receptors, what benefit the medicine is intended to provide, how long it is recommended for you, and which follow-up imaging schedule applies. Ask what to do after a missed dose or if side effects make you consider stopping.