Letrozole and tamoxifen: what should you know?

Letrozole is an aromatase inhibitor that reduces estrogen made from other hormones, mainly after menopause. Tamoxifen is a selective estrogen-receptor modulator: it can block estrogen signalling in breast tissue while acting differently in other tissues. They are not interchangeable for everyone, and they are not normally taken together unless a specialist gives a specific plan.

Letrozole may cause joint aches, hot flushes, vaginal dryness, tiredness, and effects on bone strength. Tamoxifen may cause hot flushes, vaginal symptoms, mood changes, and leg cramps. It also has uncommon but serious risks involving blood clots and the lining of the womb, which should be discussed in context.

Take the medicine prescribed at the agreed time and do not switch between letrozole and tamoxifen without oncology advice. Tell your team whether you have gone through menopause, have had clots or strokes, have uterine problems, or have bone conditions. Provide a complete list of medicines and supplements.

Keep appointments that assess symptoms and treatment response. Ask about bone health if letrozole is planned, and report abnormal vaginal bleeding if tamoxifen is used. Practical measures for hot flushes, sleep disruption, and joint discomfort can be tailored to you.

Seek urgent help for sudden chest pain, breathlessness, coughing blood, one-sided leg swelling or pain, fainting, or new weakness. Contact the team promptly for unexpected vaginal bleeding, severe pelvic pain, a new fracture, yellow skin or eyes, or side effects that prevent normal activities.

Ask why one medicine fits your situation, whether menopause status affects the choice, how long treatment is planned, how bone or womb health will be monitored, and which symptoms need same-day assessment.