PCOS & Fertility

Kasi Subbiah
3 days ago
13 min read

Evidence reviewed: September 2026

PCOS and Fertility: Excellent Treatments, Realistic Hope and a Clear Route to Pregnancy

Difficulty becoming pregnant is often the most frightening part of polycystic ovary syndrome (PCOS). A diagnosis can make it sound as though the ovaries are permanently closed for business. In reality, PCOS commonly causes a problem with timing and egg release, not an absence of eggs.

That distinction matters because difficulty ovulating is one of the most treatable causes of infertility. Many people conceive with tablets that help one follicle mature and release an egg. If tablets are not enough, there is a clear sequence of effective next steps. IVF is available when it is genuinely needed, but it is not the automatic starting point.

In 2026, the NHS began using the new name polyendocrine metabolic ovarian syndrome (PMOS). This article retains PCOS for continuity with the rest of this treatment series; both names refer to the same condition.

The short version: PCOS-related infertility usually happens because ovulation is infrequent or absent. Check the whole fertility picture rather than blaming the ovaries for everything. When anovulation is the main problem, letrozole is the recommended first-line medicine. In a landmark trial, letrozole produced more ovulations and live births than clomiphene. Clomiphene, metformin, gonadotrophin injections, selected ovarian surgery and IVF provide further effective options. Most importantly, there is a treatment ladder - not a treatment cliff.

Why PCOS can make pregnancy take longer

Each month, several small ovarian follicles may begin to develop. Usually, one becomes dominant, matures and releases an egg. PCOS can interrupt this selection process.

Higher androgen levels, altered signalling between the brain and ovaries, and insulin resistance in some people can leave several follicles in a prolonged audition while none receives the starring role. The result may be:

· infrequent ovulation;

· no ovulation in some cycles;

· long or unpredictable cycles; and

· difficulty knowing when the fertile window occurs.

An egg cannot meet sperm if it never leaves the ovary. The hopeful part is that the follicles are often present; treatment helps the ovary complete a process it has been starting but not reliably finishing.

PCOS does not mean that every fertility difficulty is caused by ovulation. Age, sperm, fallopian tubes, endometriosis, the womb and frequency or timing of intercourse still matter. A good fertility assessment checks the whole route. The ovaries should not be made to carry the entire investigation while the sperm sit in the waiting room reading an old magazine.

Does PCOS mean poor egg quality or early menopause?

Not automatically.

People with PCOS often have many small follicles and a higher anti-Mullerian hormone (AMH) level. This can indicate a larger pool of recruitable follicles, but AMH is not a pregnancy score and does not measure egg quality. Egg quality is influenced most strongly by age.

PCOS does not provide immunity from age-related fertility decline, but neither does it mean that the ovaries have run out of eggs. The common problem is unreliable ovulation. That is precisely why ovulation-induction treatment can work so well.

When should I ask for fertility help?

The usual advice to try for 12 months before assessment applies mainly when the person is younger than 35 and cycles are regular, with no known fertility concern. Assessment is generally considered after six months from age 35, and sooner at older ages.

If periods are very infrequent, absent or clearly anovulatory, there is already a reason conception may be difficult. You do not need to spend a year waiting for an egg that is rarely being released. Ask for advice earlier, particularly if:

· cycles are usually longer than 35 days or there are fewer than eight each year;

· there has been no period for around three months;

· you are 35 or older;

· there is a history of pelvic infection, endometriosis, ectopic pregnancy or pelvic surgery;

· there is a known sperm or sexual-function concern; or

· pregnancy-safe medication changes or control of diabetes or blood pressure are needed.

Earlier assessment does not mean immediate IVF. It means starting with the right information.

What should be checked before ovulation treatment?

Confirm the ovulation problem

A cycle history is often highly informative. If necessary, ovulation can be assessed with a correctly timed progesterone blood test, ultrasound monitoring or both. A fixed “day 21” progesterone test is unhelpful in a long cycle unless ovulation actually occurred around day 14. Biology has not signed a contract with the calendar.

A pregnancy test is needed before medicines that induce ovulation. Depending on the history, clinicians may also check thyroid function, prolactin and other causes of irregular or absent ovulation.

Check sperm early

A semen analysis is simple compared with many female fertility investigations and should usually occur early. Finding a substantial sperm factor changes the most efficient treatment route and prevents months of exquisitely timed intercourse aimed at the wrong obstacle.

Consider the fallopian tubes and womb

At least one open fallopian tube is required for natural conception or intrauterine insemination. The international PCOS guideline recommends deciding the timing of tubal-patency testing individually when anovulation appears to be the only problem and semen analysis is normal. Previous pelvic infection, endometriosis, ectopic pregnancy or surgery may make earlier testing more important.

Prepare for pregnancy, not perfection

Useful preconception checks include:

· folic acid at the dose recommended for the individual;

· blood pressure;

· glucose assessment - an oral glucose tolerance test is the most accurate test in PCOS and is recommended when planning pregnancy or fertility treatment;

· vaccination and medication review;

· smoking, alcohol, sleep and mental health;

· nutrition and regular physical activity; and

· management of diabetes, hypertension and other health conditions.

These steps improve safety; they are not an entrance exam that must be passed before care is offered.

Treatment options at a glance

Option	Place in Treatment	Advantage	Limitation
Letrozole tablets	First-line for anovulatory PCOS when there are no other infertility factors	Best evidence among oral agents for ovulation, pregnancy and live birth; usually encourages one dominant follicle	Off-label for fertility in many countries; pregnancy must be excluded before treatment
Clomiphene citrate	Alternative oral ovulation induction, or used with metformin in selected plans	Long experience and effective for many people	Less effective than letrozole overall; higher multiple-pregnancy risk and may affect cervical mucus or the womb lining
Metformin	Metabolic treatment; sometimes an adjunct or lower-intensity fertility option	Useful when glucose risk or another metabolic indication is present; inexpensive and little monitoring	Can improve fertility outcomes but is less effective than dedicated ovulation agents when used alone
Gonadotrophin injections	Usually second-line after oral treatment fails	Highly effective stimulation with adjustable dosing	Requires specialist scans, cost and careful control of multiple pregnancy and ovarian hyperstimulation
Laparoscopic ovarian surgery	Selective second-line alternative	May restore ovulation without repeated injections and has a low multiple-pregnancy risk	An operation with anaesthetic, surgical and adhesion risks; not a routine first choice
IVF or ICSI	When other fertility factors require it, or after first- and second-line treatment	Effective and allows embryo selection and single-embryo transfer	More invasive and expensive; PCOS increases ovarian hyperstimulation risk, so a tailored protocol is essential

1. Letrozole: first-line treatment for ovulation

The 2023 International Evidence-based PCOS Guideline recommends letrozole as the first-line pharmacological treatment for anovulatory infertility when no other infertility factor is present.

Letrozole temporarily reduces oestrogen production. The brain responds by increasing follicle-stimulating hormone (FSH), giving an ovarian follicle a stronger signal to mature. It is usually taken for a short course early in the cycle, with the exact starting day, dose, monitoring and dose escalation decided by the treating service.

How good are the outcomes?

In the large PPCOS II randomised trial of 750 women with PCOS, treatment was offered for up to five cycles:

· 27.5% had a live birth with letrozole, compared with 19.1% with clomiphene;

· ovulation occurred in 61.7% of letrozole treatment cycles, compared with 48.3% of clomiphene cycles; and

· twin pregnancy occurred in 3.4% of pregnancies with letrozole and 7.4% with clomiphene, although this difference was not statistically conclusive.

A Cochrane review found that letrozole improved live-birth and pregnancy rates compared with clomiphene; approximately ten people would need treatment with letrozole rather than clomiphene for one additional live birth in the analysed trials.

Those figures are reassuring but should be read correctly. They describe particular trial participants over a defined number of cycles. Personal chances depend on age, duration of infertility, sperm, tubes, weight and metabolic health, treatment response and simple probability. A 27.5% cumulative live-birth rate is not a ceiling on eventual success, and a successful ovulation is not the same as a guaranteed pregnancy.

What does a treatment cycle involve?

The broad sequence is:

1. Confirm that pregnancy is not already present.

2. Take letrozole for the prescribed days early in the cycle.

3. Assess response using ultrasound, a progesterone test, ovulation testing or a service-specific combination.

4. Time intercourse or insemination around expected ovulation.

5. Adjust the dose or plan if ovulation does not occur.

Some people need little monitoring after a safe response has been established; others benefit from ultrasound monitoring, especially when doses change or there are concerns about multiple follicles.

Temporary side effects can include headache, hot flushes, fatigue or dizziness. Letrozole is used off-label for fertility in many countries, including commonly in UK fertility practice. “Off-label” describes the licence, not an absence of evidence. It should be prescribed with an explanation of benefits, uncertainties and alternatives.

The guideline states that current evidence shows no difference in fetal-abnormality rates between letrozole, clomiphene and natural conception. It must not be taken during an established pregnancy.

2. Clomiphene citrate: an effective alternative

Clomiphene was the traditional first-line ovulation medicine and remains useful where letrozole is unavailable, unsuitable or not preferred.

It blocks oestrogen feedback at the brain, prompting more FSH release. Many people ovulate with it, but compared with letrozole it has lower overall ovulation and live-birth rates in PCOS. Its longer anti-oestrogen effect can sometimes thin the endometrium or make cervical mucus less sperm-friendly.

Clomiphene can cause hot flushes, mood changes, headaches and, rarely, visual symptoms. Visual disturbance requires prompt medical advice and usually stopping treatment. Because more than one follicle may mature, the chance of twins or higher-order pregnancy is increased and ultrasound monitoring may be advised.

More tablets are not automatically better. Treatment should have a planned number of cycles and a review point rather than continuing indefinitely through sheer optimism and an increasingly complicated calendar.

3. Metformin: useful, but not the strongest ovulation medicine

Metformin improves insulin action and is valuable when impaired glucose tolerance, type 2 diabetes or another metabolic indication is present. It may also improve cycle regularity and ovulation in some people.

For anovulatory infertility, metformin alone can improve pregnancy and live-birth outcomes compared with no treatment, but the international guideline advises explaining that more effective ovulation agents are available. Clomiphene is more effective than metformin alone, and letrozole is preferred over clomiphene.

Metformin may be combined with clomiphene in selected cases; this can improve ovulation and clinical-pregnancy rates compared with clomiphene alone and live birth compared with metformin alone. Whether metformin should accompany letrozole depends on the metabolic indication and the specialist plan - it is not a compulsory fertility vitamin in tablet disguise.

Common adverse effects are nausea, abdominal discomfort and diarrhoea, often reduced by gradual dose escalation and taking it with food. Long-term use may require vitamin B12 consideration.

4. Gonadotrophin injections: powerful second-line treatment

If oral treatment does not produce ovulation or pregnancy, specialist-administered gonadotrophin injections can directly stimulate the ovaries.

They are highly effective, but PCOS ovaries can respond enthusiastically. The aim is usually one mature follicle, not a follicular festival. A low-dose step-up protocol with regular ultrasound monitoring helps find the smallest effective dose.

If too many follicles grow, the cycle may need to be cancelled and unprotected intercourse avoided. This can be disappointing, but it prevents a risky multiple pregnancy. Gonadotrophins also carry a risk of ovarian hyperstimulation syndrome (OHSS), although careful dosing and monitoring reduce it.

5. Laparoscopic ovarian surgery: a selective option

Laparoscopic ovarian drilling uses keyhole surgery to make a limited number of controlled treatments to ovarian tissue. This can reduce ovarian androgen production and restore ovulation in some people who have not responded to oral medicines.

It avoids the multiple-pregnancy risk of gonadotrophin stimulation and may be useful when laparoscopy is required for another reason. However, it is an operation. Anaesthetic risk, bleeding, infection, adhesion formation and potential damage to ovarian tissue must be weighed against non-surgical alternatives. It is a second-line option, not routine ovarian maintenance.

6. IVF and ICSI: an excellent safety net, not automatic first-line care

IVF is usually considered when:

· oral and second-line ovulation treatments have not worked;

· both fallopian tubes are blocked;

· there is a substantial sperm factor;

· age or time pressure makes a faster route appropriate; or

· another fertility diagnosis changes the plan.

PCOS ovaries often produce a good number of follicles during IVF, which is useful but also increases OHSS risk. Modern PCOS-specific protocols make treatment safer. A GnRH-antagonist cycle allows an agonist trigger and, when needed, freezing all suitable embryos before later transfer. This can substantially reduce clinically important OHSS without reducing the cumulative chance of live birth.

Elective single-embryo transfer can keep multiple-pregnancy risk low. IVF is effective in anovulatory PCOS; the challenge is not persuading the ovaries to respond, but asking them to respond with suitable restraint.

ICSI is not required simply because someone has PCOS. It is mainly used for significant sperm factors or specific laboratory indications.

Do I need intrauterine insemination?

Ovulation induction can be combined with timed intercourse or, in selected circumstances, intrauterine insemination (IUI). If semen is normal, at least one tube is open and intercourse is possible, IUI is not automatically more effective merely because PCOS is present.

IUI may be relevant when there is a mild sperm issue, difficulty with intercourse, use of donor sperm or a clinic-specific indication. The treatment should solve the actual problem rather than add procedures for decorative effect.

What about weight loss, Mounjaro and fertility?

Healthy eating, physical activity, sleep and metabolic care support fertility and pregnancy health at every body size. Where higher weight is relevant and the person wants weight-management treatment, even modest weight loss may improve spontaneous ovulation. However, fertility care should not become an endless instruction to “lose weight and come back.”

Tirzepatide (Mounjaro), semaglutide and other GLP-1-based medicines are not fertility treatments. Ovulation may become more regular as weight and insulin resistance improve, which can result in an unexpected pregnancy. The PCOS guideline recommends anti-obesity medicines for reproductive outcomes only in research settings.

These medicines must not be used while trying to conceive or during pregnancy. Current MHRA advice is to stop tirzepatide at least one month and semaglutide at least two months before trying to become pregnant, with individual preconception planning. Tirzepatide may reduce oral-contraceptive reliability during initiation and for four weeks after each dose increase.

Supplements: useful foundations and expensive distractions

Folic acid is essential preconception care, with the dose tailored to personal risk. Vitamin D, iron, vitamin B12 or other nutrients should be corrected when deficient.

Inositol is widely marketed for PCOS fertility. The international guideline considers it experimental as a fertility treatment because effects on ovulation, pregnancy and live birth remain uncertain, products vary in dose and quality, and safety evidence is incomplete. “Natural” is a description of origin, not a peer-review process.

No supplement should delay evidence-based ovulation treatment, semen analysis or tubal assessment.

Pregnancy after PCOS: good outcomes with sensible monitoring

Most people with PCOS who become pregnant have a healthy baby. PCOS is nevertheless associated with higher risks of miscarriage, gestational diabetes, high blood pressure and pre-eclampsia, preterm birth and some fetal-growth problems.

This should lead to preparation and monitoring, not prophecy. Ensure the maternity team knows about the PCOS diagnosis. Blood pressure and glucose deserve particular attention; the international guideline recommends an oral glucose tolerance test when planning pregnancy or seeking fertility treatment, or at the first antenatal visit if it was not done beforehand, and again at 24 to 28 weeks.

Metformin in pregnancy has not been shown to prevent gestational diabetes, late miscarriage, hypertension, pre-eclampsia or having a large baby in women with PCOS. Whether it should be continued for another indication is an individual specialist decision.

A practical fertility pathway

Step 1: Confirm the target

Are cycles anovulatory, merely unpredictable, or actually ovulatory? Confirm the diagnosis and exclude pregnancy and other hormone causes.

Step 2: Check the whole route

Arrange semen analysis early. Consider tubal testing according to history, age, duration of infertility and proposed treatment. Review the womb and other pelvic factors when indicated.

Step 3: Optimise preconception health

Start folic acid, review medicines and vaccinations, check blood pressure and glucose, and address smoking, alcohol, sleep, nutrition, movement and mental wellbeing without blame.

Step 4: Use first-line ovulation induction

When anovulatory PCOS is the main fertility factor, discuss letrozole. Agree how response and ovulation will be assessed, how intercourse or insemination will be timed, and how many cycles will be tried before review.

Step 5: Escalate deliberately

If ovulation does not occur, adjust the oral-treatment plan. If ovulation occurs but pregnancy does not, revisit age, sperm, tubes, timing and the number of completed ovulatory cycles. Move to gonadotrophins, selected surgery or IVF when the evidence and personal priorities support it.

Step 6: Plan early pregnancy care

Once a pregnancy test is positive, contact the appropriate maternity or fertility service, review medicines promptly and arrange PCOS-aware glucose and blood-pressure monitoring.

Questions to take to your appointment

· Is lack of ovulation definitely the main fertility problem?

· Should semen analysis and tubal-patency testing happen before treatment?

· Is letrozole suitable for me, and how will we confirm the dose is working?

· Will I need ultrasound monitoring, progesterone testing, ovulation tests or a trigger injection?

· How many ovulatory cycles should we try before reassessing?

· Is metformin indicated for my metabolic health, and is there a fertility reason to combine it with another medicine?

· What would make us move to gonadotrophins, ovarian surgery, IUI or IVF?

· How will the plan minimise twins, higher-order pregnancy and OHSS?

· Which medicines or supplements must stop before conception?

· What glucose and blood-pressure checks do I need before and during pregnancy?

The bottom line

PCOS can delay pregnancy because the ovary does not reliably release an egg. That is frustrating, but it is also a problem for which we have excellent treatments.

Letrozole is the evidence-based first choice for many people with anovulatory PCOS. Clomiphene, metformin, carefully monitored gonadotrophins, selective ovarian surgery and IVF provide an effective treatment ladder when more help is needed. The route should also check sperm, tubes, age and general health so that treatment is aimed at the real obstacle.

Hope is justified here. It simply works best when paired with a proper assessment, a staged plan and enough patience to let probability do its slightly untidy work.