Letrozole For PCOS: Does It Help With Fertility?

Living with Polycystic Ovary Syndrome (PCOS) can come with its fair share of challenges, particularly for those dreaming of starting a family. One common treatment option that may be recommended for PCOS-related infertility is the medication letrozole. In this blog post, we will explore the effectiveness of letrozole in improving fertility for women with PCOS. We'll discuss how many cycles of letrozole are typically needed to conceive, the success rates of letrozole for those with lean PCOS, the standard dosage of letrozole (2.5mg), and how long letrozole can be taken to manage PCOS symptoms. As always, remember that every woman's journey is unique, so it's essential to consult with your healthcare provider for personalized advice.

How Letrozole Works

Letrozole is a medication that falls under the class of aromatase inhibitors. It works by reducing the production of estrogen and stimulating the release of follicle-stimulating hormone (FSH) from the pituitary gland. By doing so, letrozole promotes regular ovulation, which increases the chances of conception for women with PCOS.

The Benefits of Letrozole for PCOS Fertility

Numerous studies have indicated that letrozole can significantly improve ovulation and increase the chances of pregnancy in women with PCOS. Compared to other fertility treatments, letrozole has been shown to have a higher ovulation rate and pregnancy success rate (1). Additionally, letrozole is preferred by some healthcare providers due to its lower risk of multiple pregnancies compared to other medications (2). However, it's important to note that individual responses to letrozole may vary, and success rates can be influenced by factors such as age, overall health, and body mass index (BMI).

Considerations for Letrozole Use

While letrozole can be effective in improving fertility for women with PCOS, there are several considerations to keep in mind. Firstly, letrozole is a prescription medication that should only be taken under the guidance of a healthcare provider. They will determine the appropriate dosage based on your specific needs and closely monitor your response to treatment. It's essential to follow their instructions and report any concerns or side effects promptly.

How Many Cycles of Letrozole to Get Pregnant with PCOS?

One of the most common questions women with PCOS have is how many cycles of letrozole are typically needed to achieve pregnancy. The answer varies from woman to woman, depending on multiple factors such as age, overall health, and the severity of PCOS symptoms. Research suggests that up to six cycles of letrozole may be used before considering alternative fertility treatments (3). However, it's crucial to remember that patience and perseverance are key when it comes to fertility journeys. Working closely with your healthcare provider will ensure that you receive the appropriate dosage and monitoring to maximize your chances of conception.

What is the Success Rate of Letrozole for Lean PCOS?

Lean PCOS, a subtype of PCOS characterized by normal body mass index (BMI), can present unique challenges for fertility. Studies have shown that women with lean PCOS tend to respond well to letrozole treatment. The success rate of letrozole for lean PCOS varies, but research suggests that it may be higher compared to those with higher BMIs. One study found that the ovulation rate was around 78% for women with lean PCOS who were treated with letrozole (4). However, it's important to note that successful ovulation doesn't guarantee pregnancy, so proper monitoring and follow-up are crucial to assess the treatment's effectiveness and adjust the course of action if needed.

Letrozole 2.5mg

Letrozole is typically taken in the form of tablets, with the most common dosage being 2.5mg. This medication belongs to a class of drugs called aromatase inhibitors, which work by suppressing estrogen production and facilitating ovulation. Your healthcare provider will determine the appropriate dosage for you based on your individual needs. It's crucial to follow their instructions and take letrozole as prescribed to optimize its effectiveness and minimize any potential side effects.

How Long Can You Take Letrozole for PCOS?

The duration of letrozole treatment for PCOS varies depending on the specific goals and needs of each individual. In some cases, letrozole may be taken for several cycles, with breaks in between, to monitor ovulation and adjust the dosage if needed. Your healthcare provider will evaluate your progress and make recommendations based on your response to treatment. It's important to maintain open communication with your healthcare provider to ensure that the treatment plan aligns with your goals and overall well-being.


Letrozole can be a valuable tool in the journey towards fertility for women with PCOS. While it may take several cycles or adjustments in dosage, letrozole has been shown to improve ovulation rates and increase the chances of conception. However, it's essential to remember that every woman's experience with PCOS and letrozole treatment can vary. Always consult with your healthcare provider for personalized advice and guidance throughout your fertility journey. Remember, you are not alone on this path, and with the right support and self-advocacy, you can navigate PCOS and find the best treatment options for your unique needs.


  1. Legro RS, et al. (2014). Letrozole versus clomiphene for infertility in the polycystic ovary syndrome. DOI: 10.1056/NEJMoa1313517
  2. Kamath MS, et al. (2007). A comparison of pregnancy outcomes between 2.5 and 5 mg of letrozole for ovulation induction. DOI: 10.1016/j.fertnstert.2006.03.067
  3. Farquhar C, et al. (2010). Oral contraceptives for polycystic ovary syndrome. DOI:10.1002/14651858.CD001402.pub3
  4. Badawy A, et al. (2006). Clomiphene citrate or letrozole for ovulation induction in women with polycystic ovarian syndrome: a prospective randomized trial. DOI:10.1016/j.fertnstert.2005.05.071