PCOS and Fertility
Current Guidance Update
Letrozole First-Line Therapy
Ovulation induction with letrozole is recommended as the first-line pharmacological treatment for anovulatory infertility in women with PCOS.
Lifestyle Modification
Healthy eating, regular exercise, and weight management remain the first-line treatment for overweight or obese women with PCOS seeking fertility.
Metformin Support
Metformin improves ovulation rates and may reduce miscarriage risk, making it a valuable adjunct therapy for appropriate women with PCOS.
Next-Step Treatment
If letrozole is unsuccessful after six treatment cycles, gonadotropin therapy or laparoscopic ovarian surgery should be considered.
Introduction
PCOS & Fertility Treatment Guide
How PCOS Affects Fertility
The primary cause of infertility in PCOS is anovulation. Elevated LH:FSH ratios impair oocyte quality, insulin resistance reduces endometrial receptivity, and excess androgen levels may directly affect normal follicular development.
Lifestyle Modification
For overweight or obese women with PCOS, losing just 5–10% of body weight can restore ovulation in 55–100% of cases, making lifestyle changes the most effective first intervention before medication.
Ovulation Induction
- Letrozole: First-line agent with higher live birth rates.
- Clomiphene Citrate: Second-line therapy.
- Metformin: Helpful in insulin-resistant women.
- Gonadotropins: Require close monitoring for OHSS.
- Ovarian Drilling: Surgical option for resistant PCOS.
IVF in PCOS
IVF is generally recommended after failure of six cycles of oral ovulation induction with or without IUI. GnRH antagonist protocols combined with freeze-all embryo strategies significantly reduce the risk of OHSS.
Preconception Optimisation
- Achieve a BMI as close to the normal range as possible.
- Optimise blood glucose control.
- Ensure normal thyroid function before conception.
- Commence folic acid supplementation (400mcg–5mg daily).
Frequently Asked Questions
If I have PCOS, will I need IVF to get pregnant?
Most women with PCOS do not require IVF; most conceive with lifestyle modification and/or oral ovulation induction agents.
Does metformin improve fertility in PCOS?
As an adjunct to letrozole, metformin modestly improves outcomes, particularly in insulin-resistant women, but is not first-line monotherapy for fertility.
What is OHSS and am I at risk?
Ovarian Hyperstimulation Syndrome is an exaggerated ovarian response to fertility drugs; PCOS is the most important risk factor, mitigated by careful monitoring and freeze-all IVF protocols.
Conclusion
PCOS-related infertility is among the most treatable forms of female infertility. A structured, evidence-based approach beginning with lifestyle optimisation allows the majority of women with PCOS to achieve their reproductive goals.
Sources & References
This article draws on guidance current at the time of writing from the following bodies and publications:
- ESHRE/ASRM (2023)
- ACOG Practice Bulletin (2022, updated 2024)
- FIGO (2023 PCOS Guidelines)
- NICE NG156 (2023)
General reference bodies for women's health guidance:
RCOG
rcog.org.ukACOG
acog.orgFIGO
figo.orgWHO
who.intNICE
nice.org.uk⚠ IMPORTANT DISCLAIMER
This article is provided for general knowledge and reference purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. No medication, treatment, or change to your healthcare should be undertaken based on this content without first consulting a qualified doctor. Always seek the advice of your physician or another qualified health provider with any questions you may have regarding a medical condition.
