Medical Oncologist
Medicines
Alpelisib, fertility, menopause and sexual health
Alpelisib is taken with fulvestrant, and blocking oestrogen causes most menopause symptoms such as hot flushes and vaginal dryness. Alpelisib adds tiredness, loose motions and a higher chance of thrush when sugar is high. It may affect fertility and can harm a baby, so contraception is needed. This page offers practical, plain-language help.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
On this page
- How does alpelisib affect fertility, menopause and sexual health?
- The main ways treatment can affect you
- Contraception and breastfeeding at a glance
- The vocabulary, in plain language
- What is known and what is not
- Easing dryness and discomfort
- Managing hot flushes and sleep
- Opening the conversation
- What people assume about fertility and sex
- Common questions about fertility, menopause and sex on alpelisib
The short answer
How does alpelisib affect fertility, menopause and sexual health?
Alpelisib is used for advanced hormone receptor positive breast cancer, together with fulvestrant, a hormone injection that blocks oestrogen. Most people taking it are postmenopausal women or men, but premenopausal women can also be treated when their ovaries are switched off with monthly or three-monthly injections or removed by surgery. As a result, the hormone treatment around alpelisib usually has a bigger effect on menopause and sexual health than alpelisib itself. Blocking oestrogen commonly causes hot flushes, vaginal dryness, lower sexual desire and joint aches. Alpelisib adds its own effects: tiredness, loose motions, mouth sores, rash and weight loss can all affect how you feel about intimacy. High blood sugar can also make vaginal thrush infections more likely, and some diabetes medicines increase that risk further. On fertility, animal studies suggest alpelisib may reduce fertility in both women and men, and it can harm a developing baby. The official prescribing information advises effective contraception for women who could become pregnant, and for men with such partners, during treatment and for at least one week after the last dose. Breastfeeding is not advised during treatment and for at least a week after. Hormonal contraception is generally avoided in breast cancer, so non-hormonal methods are preferred. Talking openly with your team about these changes helps you find practical solutions.
Hormone treatment drives menopause symptoms
Fulvestrant and ovarian suppression cause most flushes and dryness.
Pregnancy must be avoided
Use non-hormonal contraception during and after treatment.
Intimacy can continue
Practical steps help with dryness, tiredness and confidence.
This page gives general information only. Discuss your own situation with your oncologist.Areas affected
The main ways treatment can affect you
Each area can be helped, even if not fully prevented.
Menopause symptoms
Hot flushes, night sweats, joint aches and mood changes, mainly from blocking oestrogen.
Vaginal health
Dryness and discomfort during sex, and a higher chance of thrush when blood sugar is high.
Report itching or discharge.Fertility and pregnancy
Alpelisib may reduce fertility and can harm a developing baby, so contraception is essential.
Desire and confidence
Many physical and emotional factors play a part.
Common contributors
- Tiredness and loose motions
- Rash, mouth sores or weight loss
- Worry about the future
Precautions
Contraception and breastfeeding at a glance
Who
General advice from prescribing information
Women who could become pregnant
Effective contraception during treatment and for at least a week after the last dose
Men with a partner who could become pregnant
Condoms during treatment and for at least a week after the last dose
Breastfeeding
Not during treatment and for at least a week after the last dose
Fulvestrant
Has its own, longer contraception advice, so ask your team
Type of contraception
Non-hormonal methods such as condoms or a copper coil are preferred
Words you will hear
The vocabulary, in plain language
- Ovarian suppression
- Injections that switch off the ovaries so they stop making oestrogen.
- Fulvestrant
- A hormone injection that blocks and breaks down oestrogen receptors.
- Vaginal thrush
- A yeast infection causing itching, soreness and discharge, more likely with high sugar.
- Vaginal moisturiser
- A non-hormonal product used regularly to relieve dryness.
- Copper coil
- A non-hormonal device placed in the womb to prevent pregnancy.
- Psychosexual counselling
- Specialist support for sexual and relationship concerns.
Being straight with you
What is known and what is not
Research on fertility and sexual health with alpelisib specifically is limited, so advice draws on animal studies and on hormone treatment more broadly.
Fertility effects in people are uncertain
Animal studies suggest possible effects, but human data are scarce.
Pregnancy decisions are complex
With advanced breast cancer on ongoing hormone treatment, pregnancy raises serious health questions to discuss openly with your oncologist.
Symptoms often overlap
It can be hard to tell which medicine causes which change.
What this page cannot tell you
It cannot tell you how your own fertility or sexual health will be affected. Your team and a specialist can help.
Talk to our team
Have a question about your situation?
Call the helpline or leave your details, and someone will help you arrange a consultation at the CION centre nearest you. One helpline serves every CION centre.
Call 1800 202 8726
Helpline open 24/7
Practical help
Easing dryness and discomfort
Vaginal dryness is one of the most common and treatable problems during hormone treatment.
Moisturise regularly
Non-hormonal vaginal moisturisers used a few times a week improve comfort over time.
Use lubricant for sex
Generous water-based or silicone-based lubricant reduces friction and pain.
Watch for thrush
Itching, soreness or thick discharge may be thrush, especially when sugar is high. Treatment is simple, so tell your team.
Ask about other options
Hormone creams are usually avoided but may be discussed in some situations. Pelvic floor exercises and dilators can also help.
Menopause symptoms
Managing hot flushes and sleep
Hot flushes and night sweats can disrupt sleep and daily life.
Simple measures
Light cotton clothing, layers, a fan by the bed and cool drinks help many people.
Know your triggers
Spicy food, hot drinks, alcohol and stress often make flushes worse.
Medicines
Some non-hormonal medicines can reduce troublesome flushes. Hormone replacement therapy is generally avoided after breast cancer.
Protect your bones
Low oestrogen can thin bones, so your team may suggest calcium, vitamin D and exercise.
Talking about it
Opening the conversation
Sex and fertility can be difficult to discuss, especially in front of family. Raising them still brings relief for many people.
With your team
Write questions down, and ask to speak privately if that feels easier.
With your partner
Share what feels comfortable now, and remember that closeness includes touch, affection and time together.
Specialist support
Counsellors and sexual health specialists work with individuals and couples.
Commonly believed
What people assume about fertility and sex
No periods means no need for contraception.
Pregnancy may still be possible, so contraception is advised.
Sex could make the cancer worse.
Sex does not make breast cancer grow or spread.
Itching is just part of the rash.
Genital itching may be thrush linked to high sugar. It is treatable.
Low desire means the relationship is failing.
Treatment and worry commonly lower desire. Support can help.
Questions we are asked
Common questions about fertility, menopause and sex on alpelisib
Which contraception should I use?
Non-hormonal methods are usually preferred in hormone receptor positive breast cancer. Condoms and the copper coil are common choices. Your oncologist or gynaecologist can help you choose a reliable method and explain how long to continue it after treatment ends.
I am premenopausal. Why do I need ovarian suppression?
Fulvestrant works best when oestrogen levels are low, as they are after menopause. In premenopausal women, injections that switch off the ovaries, or surgery, create that low-oestrogen state. This often brings on menopause symptoms, which your team can help you manage.
Why do I keep getting thrush?
High blood sugar feeds yeast, and some diabetes medicines used on alpelisib increase sugar in the urine, which raises the risk further. Tell your team about itching, soreness or discharge. Treatment is usually simple, and better sugar control helps prevent it returning.
Can I get pregnant after stopping alpelisib?
This is a complex question with advanced breast cancer and ongoing hormone treatment. Fertility may already be affected by earlier treatments and age. If having a child matters to you, discuss it openly with your oncologist and a fertility specialist before making plans.
Does alpelisib affect men's sexual health?
Men may notice tiredness and lower energy, and those also receiving medicine to lower testosterone may have reduced desire or erection problems. Animal studies suggest alpelisib may affect male fertility. Men should use condoms during treatment and for at least a week after.
Is it safe to have sex on alpelisib?
Generally yes, when you feel well enough. Use contraception, a lubricant if dryness is a problem, and avoid sex when mouth sores or genital soreness make it painful. If you have any bleeding or pain, let your team know.
Can I use vaginal oestrogen cream?
Vaginal oestrogen is usually avoided in hormone receptor positive breast cancer, especially with advanced disease. Non-hormonal moisturisers and lubricants are the first choice. If dryness remains severe, discuss the balance of risks with your oncologist.
How can I cope with body changes?
Weight loss, rash and tiredness can affect confidence. Gentle skin care, clothes you feel good in, and talking with your partner or a counsellor can help. Support groups let you hear how others have adjusted to similar changes.
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Sources
- European Medicines Agency — Piqray product information
- National Cancer Institute — Sexual health issues in women with cancer
- Breast Cancer Now — Menopausal symptoms and breast cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.