Letrozol

What Is Letrozole

Letrozole is a prescription medicine used mainly in the treatment of hormone receptor-positive breast cancer in postmenopausal women. It is also sometimes used in fertility treatment under strict medical supervision.

Breast cancer is a disease where abnormal breast cells grow in an uncontrolled way. In some types of breast cancer, these cells depend on hormones like estrogen to grow.

Letrozole belongs to a group of medicines called aromatase inhibitors. These medicines lower estrogen levels in the body.

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A medical oncologist usually prescribes Letrozole for cancer treatment, while a gynecologist or fertility specialist may use it in selected infertility cases.

It is a long-term treatment medicine and should always be taken under medical supervision.

What This Medicine Does in the Body

Letrozole works by lowering the amount of estrogen produced in the body.

Estrogen is a natural female hormone that plays an important role in reproduction and bone health. However, in some breast cancers, estrogen can help cancer cells grow faster.

The body produces estrogen using an enzyme called aromatase.

Letrozole blocks this aromatase enzyme. When aromatase is blocked, the body produces much less estrogen.

With lower estrogen levels, hormone-sensitive cancer cells grow more slowly or stop growing.

In fertility treatment, lowering estrogen temporarily can help stimulate ovulation in some women by affecting hormonal balance.

Uses of Letrozole / Used For

Doctors prescribe Letrozole mainly for the treatment of hormone receptor-positive breast cancer in postmenopausal women.

It is used to help prevent cancer growth, reduce recurrence risk, and support long-term cancer management after surgery or other treatments.

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In some cases, Letrozole is also used in fertility treatment for women who have difficulty ovulating. It helps stimulate ovulation by influencing hormone levels.

However, fertility use is strictly controlled and should only be done under a specialist’s guidance.

How Letrozole Works

Letrozole works by blocking estrogen production in the body.

The body converts other hormones into estrogen using the aromatase enzyme. This process mainly happens in fat tissue and other organs.

Letrozole binds to this enzyme and stops it from working.

When aromatase is blocked, estrogen levels drop significantly.

In breast cancer, this reduces the hormone supply that cancer cells need to grow.

In fertility treatment, short-term estrogen reduction can help trigger hormonal changes that support ovulation in some women.

Because it strongly affects hormone levels, it is used carefully and usually for long durations in cancer treatment.

Side Effects of Letrozole

Like all medicines, Letrozole may cause side effects, especially due to reduced estrogen levels in the body.

Common side effects include hot flashes, tiredness, headache, joint pain, and sweating.

Some women may experience bone or muscle discomfort during treatment.

Hot flashes are sudden feelings of warmth in the body, often in the face or chest.

Long-term use may lead to bone thinning (osteoporosis) because estrogen helps maintain bone strength.

Some people may also experience mood changes or mild dizziness.

Rare but serious side effects may include high cholesterol levels or liver function changes.

Regular monitoring is important during long-term treatment.

Medical Disclaimer

This information is for educational purposes only. Letrozole should only be used under the supervision of a medical oncologist, gynecologist, or fertility specialist. Always follow prescribed dosage carefully and do not stop treatment without medical advice.