Letrozole Oral Tablets: Side Effects, Uses, and More

Letrozole Oral Tablets: Side Effects, Uses, and More


When it comes to managing certain hormone receptor-positive breast cancers, Letrozole oral tablets have emerged as a crucial tool in the arsenal of oncologists. This article will delve into the uses, potential side effects, and important considerations associated with Letrozole.

Understanding Letrozole

Letrozole, commonly sold under the brand name Femara, belongs to a class of drugs known as aromatase inhibitors. It is primarily prescribed to postmenopausal women with hormone receptor-positive breast cancer. Unlike chemotherapy, which targets rapidly dividing cells, Letrozole tackles the cancer at its source by inhibiting the production of estrogen.

Mechanism of Action

Letrozole works by inhibiting the enzyme aromatase, responsible for converting androgens into estrogen. By lowering estrogen levels in the body, it helps to slow down or shrink hormone receptor-positive breast cancers.

Medical Uses

The primary use of Letrozole is in the treatment of:

  • Early-stage hormone receptor-positive breast cancer
  • Advanced-stage hormone receptor-positive breast cancer

Potential Side Effects

Common Side Effects

While Letrozole is generally well-tolerated, some common side effects may include:

  • Hot flashes
  • Fatigue
  • Joint pain
  • Headaches
  • Nausea

Serious Side Effects

In rare cases, Letrozole can lead to more serious side effects, such as:

  • Bone weakening
  • Osteoporosis
  • Increased cholesterol levels
  • Risk of heart disease

Who Should Not Take Letrozole

Letrozole may not be suitable for individuals with:

  • Severe liver disease
  • Known hypersensitivity to the drug
  • Pre-menopausal women

Dosage and Administration

The typical dosage of Letrozole is 2.5 mg once a day, with or without food. Your doctor will determine the appropriate duration of treatment based on your specific condition.

Precautions and Interactions

It’s important to inform your doctor about any existing medical conditions or medications you are taking before starting Letrozole. Certain drugs, such as tamoxifen, may interact with Letrozole and affect its effectiveness.

Lifestyle Tips While Taking Letrozole

  • Engage in weight-bearing exercises to support bone health.
  • Consume a calcium-rich diet or take supplements as recommended by your doctor.
  • Limit alcohol intake, as it may exacerbate certain side effects.

Letrozole vs. Other Treatment Options

Letrozole offers advantages over some other treatments, as it specifically targets estrogen production. It may be preferred for those who cannot tolerate other medications or who have completed tamoxifen therapy.

Frequently Asked Questions (FAQs)

Is Letrozole a chemotherapy drug?

No, Letrozole is not a chemotherapy drug. It is an aromatase inhibitor used in hormone receptor-positive breast cancer treatment.

Can men take Letrozole?

Letrozole is not typically prescribed for men, as it specifically addresses postmenopausal hormone imbalances.

How long should I take Letrozole?

The duration of Letrozole treatment varies based on your individual condition and your doctor’s recommendations.

What should I do if I miss a dose?

If you miss a dose, take it as soon as you remember. However, if it’s close to the time for your next dose, skip the missed dose and continue with your regular schedule.

Can Letrozole be used during pregnancy?

No, Letrozole is contraindicated during pregnancy, as it may harm the developing fetus.


Letrozole oral tablets play a vital role in managing hormone receptor-positive breast cancer in postmenopausal women. By inhibiting estrogen production, this medication offers a targeted approach to treatment. While potential side effects exist, the benefits often outweigh the risks, and close monitoring by your healthcare provider ensures the best possible outcome.

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