Advanced Breast Cancer: Learn about treatment options.

Letrozole

Pronunciation

Generic Name: letrozole (LET-roe-zole)
Brand Name: Femara

Letrozole is used for:

Primarily treating certain kinds of breast cancer in women past menopause. It may also be used for other conditions as determined by your doctor.

Letrozole is an aromatase inhibitor. It works by reducing the total amount of estrogen produced primarily in the body. This helps to starve cancer cells by depriving them of estrogen.

Do NOT use letrozole if:

  • you are allergic to any ingredient in letrozole
  • you have not started menopause

Contact your doctor or health care provider right away if any of these apply to you.

Slideshow: Flashback: FDA Drug Approvals 2013

Before using letrozole:

Some medical conditions may interact with letrozole. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines or other substances
  • if you have liver problems or high cholesterol
  • if you are still having menstrual periods or have not completely finished menopause
  • if you are taking hormone replacement therapy (HRT)

Some MEDICINES MAY INTERACT with letrozole. Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Tamoxifen because it may decrease letrozole's effectiveness

This may not be a complete list of all interactions that may occur. Ask your health care provider if letrozole may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use letrozole:

Use letrozole as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Take letrozole by mouth with or without food.
  • Take letrozole on a regular schedule to get the most benefit from it.
  • If you miss a dose of letrozole, take it as soon as possible. If it is almost time for the next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use letrozole.

Important safety information:

  • Letrozole may cause drowsiness or dizziness. These effects may be worse if you take it with alcohol or certain medicines. Use letrozole with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
  • Letrozole may cause dizziness; alcohol, hot weather, exercise, or fever may increase this effect. To prevent dizziness, sit up or stand slowly, especially in the morning. Sit or lie down at the first sign of dizziness.
  • If you may become pregnant, you must use effective birth control while you take letrozole. Women who are going through or have recently gone through menopause may still become pregnant. Talk with your doctor about the use of effective birth control while you take letrozole.
  • Lab tests, including bone mineral density or cholesterol levels, may be performed while you use letrozole. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
  • Use letrozole with caution in the ELDERLY; they may be more sensitive to its effects.
  • Letrozole should not be used in CHILDREN; safety and effectiveness in children have not been confirmed.
  • PREGNANCY and BREAST-FEEDING: Do not use letrozole if you are pregnant. Avoid becoming pregnant while you are taking it. If you think you may be pregnant, contact your doctor right away. It is not known if letrozole is found in breast milk. If you are or will be breast-feeding while you use letrozole, check with your doctor. Discuss any possible risks to your baby.

Possible side effects of letrozole:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Back, leg, or arm pain; breast pain; constipation; cough; diarrhea; dizziness; headache; hot flashes; flushing; increased sweating; indigestion; joint or muscle pain; loss of appetite; mild swelling or fluid retention; nausea; night sweats; sleeplessness; stomach pain; tiredness; vaginal dryness or irritation; vomiting; weakness; weight gain or loss.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); calf pain or tenderness; chest pain; confusion; fever, chills, or sore throat; increased or painful urination; numbness of an arm or leg; one-sided weakness; severe or persistent bone pain; severe stomach pain; shortness of breath; sudden severe headache, vomiting, dizziness, or fainting; swelling of the ankles or feet; unexplained vaginal bleeding or discharge; vision or speech changes.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately.

Proper storage of letrozole:

Store letrozole at 77 degrees F (25 degrees C). Brief storage at temperatures between 59 and 86 degrees F (15 and 30 degrees C) is permitted. Store away from heat, moisture, and light. Do not store in the bathroom. Keep letrozole out of the reach of children and away from pets.

General information:

  • If you have any questions about letrozole, please talk with your doctor, pharmacist, or other health care provider.
  • Letrozole is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.
  • Check with your pharmacist about how to dispose of unused medicine.

This information should not be used to decide whether or not to take letrozole or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about letrozole. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to letrozole. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using letrozole.

Issue Date: April 2, 2014
Database Edition 14.2.1.001
Copyright © 2014 Wolters Kluwer Health, Inc.

Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.

Advanced Breast Cancer: Learn about treatments to improve quality of life. Click Here

Close
Hide
(web3)