Aromatase Inhibitor Therapy

Aromatase inhibitor therapy uses medicines such as anastrozole or letrozole to reduce the body's production of estrogen. Lower estrogen can limit stimulation of hormone receptor-positive breast cancer cells. This is a systemic treatment, so it works throughout the body and may be used after initial treatment or when cancer needs ongoing control. Read about the condition in [Hormone Receptor-Positive Breast Cancer](/conditions/hormone-receptor-positive-breast-cancer/).

Most aromatase inhibitors are tablets taken on a regular schedule. Your clinician will confirm the dose, timing, and how to handle a missed tablet. Treatment may continue for an extended period when its benefits remain relevant. Appointments can include symptom review, examination, and discussion of bone health and other medicines. Keep a current medicine list and mention supplements before starting.

Joint or muscle aches, stiffness, hot flushes, sweating, tiredness, vaginal dryness, and changes in mood or sleep can occur. Lower estrogen can reduce bone strength over time, so your team may assess fracture risk and consider bone-protective care. Seek urgent help for chest pain, severe breathlessness, fainting, sudden weakness, or a severe allergic reaction. Report new severe bone pain, a fall, persistent low mood, or symptoms that stop you from taking tablets.

Aromatase inhibitors can reduce estrogen-driven stimulation when the cancer has hormone receptors. The expected benefit depends on tumour features, menopausal status, previous treatment, and whether the medicine is used alone or as part of a wider plan. Follow-up helps the team decide whether treatment is controlling the cancer and whether side effects can be managed. A different endocrine medicine may be considered if the balance changes.

These medicines do not work by directly removing a tumour. They change a hormone pathway that may be helping cancer cells grow. Take tablets consistently and tell the team about joint symptoms, fractures, dental procedures, and any difficulty staying on treatment.

An aromatase inhibitor may be offered to people with hormone receptor-positive breast cancer when reducing estrogen is part of the treatment strategy. The choice depends on menopause-related hormone status, pathology, stage, previous endocrine treatment, and individual health. Your breast cancer team can explain why this medicine fits your plan.

The team confirms the tumour's hormone receptors, reviews other conditions and medicines, discusses bone health, and selects an aromatase inhibitor. You then begin tablets and receive a follow-up plan. Keep notes about aches, hot flushes, sleep, mood, and missed doses so the team can adjust support. [Aromatase Inhibitor Drugs](/materials/aromatase-inhibitor-drugs/) provides medicine-focused reading.

There is no operation-related recovery from the tablets. Some effects appear early, while stiffness, bone changes, or sexual-health concerns may need longer-term attention. Regular movement, strength work suited to your ability, comfortable joint care, and sleep support may help. Never stop suddenly because of side effects without contacting the prescribing team; another plan may be possible.

Ask how your team will monitor bone density and fracture risk, especially if you have had fragile bones. Tell clinicians about dental treatment, pain after a fall, heart symptoms, liver problems, or medicines that affect bones. Emotional and sexual wellbeing also deserve direct discussion, even when they are not the reason for the appointment.

Depending on your circumstances, alternatives may include another endocrine medicine, a different sequence of treatment, surgery, radiotherapy, chemotherapy, or active follow-up. The appropriate choice depends on the cancer's biology, prior therapy, menopausal status, and your preferences. Ask what benefit is expected and how each option would affect daily life.

Choose a breast cancer service that can coordinate oncology, breast surgery, radiotherapy, nursing, pharmacy, and bone-health support. Bring pathology details, scan reports, your medicine list, and questions about joint pain, menopause symptoms, intimacy, and fertility. Ask for a clear contact route between visits.