What is Afimoxifene used for?

Afimoxifene is being researched for the treatment of breast cancer, non-invasive breast cancer (ductal carcinoma in situ), and breast pain.

How does Afimoxifene work in the body?

Afimoxifene acts as an estrogen receptor modulator and an antagonist for the estrogen-related receptor gamma.

Is Afimoxifene approved for use yet?

No, Afimoxifene is currently a research compound in Phase 3 clinical trials and has not received official approval.

Can Afimoxifene treat breast pain?

Research indicates Afimoxifene may be used to address mastodynia, which is the medical term for breast pain.

Is Afimoxifene a natural product?

Yes, the data identifies Afimoxifene as a natural product.

What type of molecule is Afimoxifene?

Afimoxifene is classified as a small molecule.

4-Hydroxytamoxifen | CAS 68047-06-3 | TXUZVZSFRXZGTL

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Estrogen receptor modulator

Afimoxifene is a small molecule being studied for its potential to treat breast cancer and related conditions. It works by acting as an estrogen receptor modulator and an estrogen-related receptor gamma antagonist.

How it worksAfimoxifene works by changing how estrogen receptors in the body respond and by blocking certain estrogen-related receptors.

Used for

Breast cancerBreast ductal carcinoma in situ (non-invasive breast cancer)Mastodynia (breast pain)

Conditions

Breast cancerBreast ductal carcinoma in situMastodynia

Class

Estrogen receptor modulatorEstrogen-related receptor gamma antagonistEndocrine system

How to take

This drug is currently in clinical development (Phase 3) and is not yet FDA-approved for general use.

Talk to your doctor

Questions to ask

·Is Afimoxifene appropriate for my specific type of breast cancer?
·What are the potential risks of estrogen receptor modulators?
·How will this drug interact with my current hormone therapy?

Educational summary derived from FDA labeling, AI-assisted. Not medical advice — consult a healthcare professional. Updated 2026-04-26.

How to take

Talk to your doctor

Frequently asked questions (6)