Tamoxifen

Product Overview

Tamoxifen is a prescription medication classified as a selective estrogen receptor modulator (SERM). It is commonly used in the treatment and prevention of hormone receptor–positive breast cancer.

Tamoxifen 10mg and 20mg tablets are commercially manufactured products supplied in accordance with your doctor’s prescription.

Tamoxifen works by blocking the effects of estrogen in breast tissue while maintaining selective activity in other parts of the body.

What Tamoxifen Is Used For

Tamoxifen may be prescribed for:

Breast Cancer Treatment

• Early-stage hormone receptor–positive breast cancer
• Advanced or metastatic breast cancer
• Treatment following surgery, chemotherapy, or radiation
• Long-term therapy to reduce recurrence risk

Breast Cancer Risk Reduction

• Women at high risk of developing breast cancer
• Risk reduction in certain genetic or family-history cases

Other Specialist Uses

In some cases, Tamoxifen may be prescribed for:

• Hormonal management in specific medical conditions
• Certain fertility-related protocols (under specialist supervision)

Your doctor will determine the appropriate indication and duration.

How Tamoxifen Works

Tamoxifen binds to estrogen receptors in breast tissue and blocks estrogen’s ability to stimulate cancer cell growth.

Its selective action means it:

• Blocks estrogen activity in breast tissue
• May act differently in bone and uterine tissue
• Reduces the risk of cancer recurrence

Tamoxifen does not lower estrogen levels but prevents estrogen from activating certain cells.

Directions for Use

Take exactly as prescribed by your doctor.

General guidance:

• Usually taken once daily
• May be taken with or without food
• Swallow tablet whole with water
• Take at the same time each day

Treatment duration may range from 5 to 10 years depending on your oncology plan.

Do not stop taking Tamoxifen without consulting your doctor.

Important Safety Information

Before starting Tamoxifen, inform your doctor if you have:

• A history of blood clots
• Stroke or cardiovascular disease
• Uterine conditions
• Liver disease
• High cholesterol
• Vision problems

Tamoxifen requires regular medical monitoring.

Possible Side Effects

Side effects vary depending on individual response and duration of use.

Common side effects may include:

• Hot flushes
• Night sweats
• Vaginal discharge
• Irregular menstrual cycles
• Mood changes
• Fatigue

Less common but serious risks:

• Blood clots
• Stroke
• Endometrial (uterine) changes
• Visual disturbances
• Liver function changes

Seek immediate medical attention if you experience leg swelling, chest pain, sudden shortness of breath, severe headache, or abnormal vaginal bleeding.

Monitoring & Follow-Up

Your healthcare provider may recommend:

• Regular breast examinations
• Imaging (as advised by your specialist)
• Gynaecological review (if applicable)
• Liver function testing
• Blood work as needed

Long-term therapy requires ongoing assessment.

Fertility, Pregnancy & Breastfeeding

Tamoxifen should not be used during pregnancy, as it may cause harm to an unborn baby.

Effective contraception is recommended during treatment and for a period after stopping, as advised by your doctor.

Breastfeeding is not recommended while taking Tamoxifen.

Drug Interactions

Tamoxifen may interact with:

• Certain antidepressants (particularly some SSRIs)
• Hormone replacement therapy
• Blood thinners
• Other hormonal medications

Always provide a complete list of medications and supplements to your healthcare provider.

Storage Instructions

• Store below 25°C
• Keep in original packaging
• Protect from moisture
• Keep out of reach of children
• Do not use after expiry date

Frequently Asked Questions

Is Tamoxifen chemotherapy?

No. Tamoxifen is a hormone therapy, not chemotherapy.

How long will I need to take Tamoxifen?

Many patients take it for 5–10 years, depending on their treatment plan.

Does Tamoxifen lower estrogen levels?

No. It blocks estrogen receptors in certain tissues rather than reducing estrogen production.

Can Tamoxifen affect my menstrual cycle?

Yes. It may cause irregular periods or temporary changes in menstruation.

Why is monitoring necessary?

Tamoxifen can affect the uterus, liver, and clotting risk. Regular medical review ensures safe treatment.

Disclaimer

This information is provided for educational purposes only and does not replace professional medical advice. Tamoxifen should only be used under the supervision of a qualified healthcare professional.

For personalised advice regarding your prescription, speak with the pharmacists at Angel Pharmacy.