What should you know about tamoxifen citrate?

Tamoxifen attaches to estrogen receptors and changes the message those receptors send. This can slow or stop the growth of hormone-sensitive breast cancer cells. The same medicine may be prescribed after treatment to lower the chance of a hormone-sensitive cancer returning, or for risk reduction in people whose risk has been assessed as elevated. Read more about Tamoxifen for its medicine-specific information.

Because tamoxifen affects estrogen signalling throughout the body, benefits and side effects can differ from person to person. Hot flushes, night sweats, vaginal changes, mood changes, and tiredness can occur. Some people have no troublesome effects.

Take tamoxifen exactly as prescribed and at a consistent time if that helps you remember. Do not stop it or double a missed dose without checking with your treatment team. Tell them about every prescription medicine, non-prescription product, and supplement because some medicines can alter tamoxifen’s effect.

Keep appointments for symptom review and any monitoring your clinician recommends. Ask whether your treatment is being used as cancer treatment or as Risk-Reducing Endocrine Therapy; the purpose affects how your plan is discussed. Hormone Therapy for Cancer is one broader treatment approach that may be combined with other care.

Contact your care team promptly for unusual vaginal bleeding or discharge, new pelvic pain, a new breast change, or symptoms that are persistent or difficult to manage. Seek urgent help for sudden chest pain, trouble breathing, coughing blood, one-sided weakness, or painful swelling and redness in an arm or leg, because these can signal a serious clot or other emergency.

Ask what role tamoxifen has in your plan, how long you are expected to take it, which symptoms should be reported quickly, and whether any current medicines or supplements need review.