Patient information on use of Tamoxifen in patients with Hereditary Haemorrhagic Telangiectasia (HHT)
Who is this information for?
This information is for patients, families and carers who may commence treatment with tamoxifen for HHT.
What does the use of it in HHT patients aim to achieve?
- The benefits of tamoxifen aims to reduce the risk, frequency and severity of nosebleeds (read more information about nosebleeds) in HHT patients.
- There are several studies showing men and women with HHT have shorter and fewer nosebleeds when they are taking the medication.
- Approximately 90% of people taking it notice improvement. Anaemia (low level of haemoglobin) may also improve.
What would be the dose and dosage?
- The dose is 20mg once per day for both male and female patients.
How long does it take for tamoxifen work?
- An improvement in the frequency and severity of nose bleeds should be noticed within 1 –
2 months of starting.
How does it work?
- It acts on the receptor for the female hormone, oestrogen. It was developed for use in patients to treat and prevent breast cancer and has been used for this for over 30 years.
- In the past, people with HHT and bad nosebleeds were sometimes given hormone therapy and treatment with progesterone and oestrogens. There are usually more side effects when these are taken at effective doses.
Who can be prescribed it?
It is suitable for use for men and women with severe nosebleeds due to HHT as long as they are:
- over 18 years old,
- NOT pregnant or trying for a baby,
- NOT taking the contraceptive pill,
- HAVE NOT suffered from blood clots (e.g. DVT or PE)
- DO NOT HAVE uterine cancer
- NOT receiving hormone treatment for another reason (e.g. for peri-menopausal symptoms, or for cancer)
What are the side effects?
- As with all medications there are potential side effects. The side effects are unusual and must be balanced against the annoyance and health risk of the nosebleeds.
- In women, these can be similar to the symptoms of menopause. The most common side effects are hot flushes and vaginal discharge. Some women experience irregular menstrual periods, headaches, fatigue, nausea and/or vomiting, vaginal dryness or itching, irritation of the skin around the vagina, and skin rash. As with the menopause, not all women who take tamoxifen have these symptoms.
- Men who take it may experience headaches, nausea and/or vomiting, skin rash, impotence, or a decrease in sexual interest; again these are unusual.
- More seriously, but rarely, there is a high risk of developing blood clots (DVT). This is about the same risk as when taking hormone replacement therapy (HRT).
- Other very rare possible side effects are strokes, cataracts and, in women, uterine cancer.
When should I seek advice from the GP when taking it?
- Women who take tamoxifen should see their GP if they experience vaginal bleeding or pelvic pain
Concerns or questions?
You can contact your ENT Specialist at the Melbourne ENT Group (MEG):
Your GP is also the best contact for ongoing care and concerns.