What should you know about PCT tamoxifen?

Tamoxifen attaches to oestrogen receptors and can block or alter oestrogen signalling in some tissues. In oncology it may be used for hormone-sensitive breast cancer or to reduce risk in selected people. The abbreviation PCT is also used online for post-cycle therapy, a non-standard context that may involve self-directed medicine use; this is not a substitute for oncology care.

The right use depends on the reason for treatment, reproductive status, other medicines, and personal medical history. Tamoxifen can cause side effects and can interact with medicines. A prescription, online protocol, or advice from a gym or social-media source should not determine how it is taken.

Take tamoxifen only as prescribed and do not change, share, or restart it without medical advice. Tell the prescriber about pregnancy or plans for pregnancy, abnormal vaginal bleeding, blood-clot history, stroke, liver problems, and every medicine or supplement you use. Keep appointments so symptoms and treatment decisions can be reviewed.

For oncology context, see [Tamoxifen](/materials/tamoxifen/), [Hormone Therapy for Cancer](/treatments/systemic-therapy/hormone-therapy-for-cancer/), and [Risk-Reducing Endocrine Therapy](/treatments/risk-reduction-and-prevention/risk-reducing-endocrine-therapy/).

Seek urgent medical help for sudden chest pain, breathlessness, coughing blood, one-sided leg swelling or pain, sudden weakness, trouble speaking, or severe headache. Contact your clinician promptly for unusual vaginal bleeding, vision changes, or troublesome mood or physical effects. Do not wait for a routine review when symptoms suggest a clot or stroke.

Why is tamoxifen being recommended? How long should the plan be reviewed for? Which medicines may interact with it? What symptoms need urgent attention? What monitoring do I need, and what should I do if I miss a dose?