What is/are Femara?

LETROZOLE blocks the production of estrogen. Certain types of breast cancer grow under the influence of estrogen. Letrozole helps block tumor growth. This medicine is used to treat advanced breast cancer in postmenopausal women. This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

What should I tell my health care providers before I take this medicine?

They need to know if you have any of these conditions:

• liver disease
• osteoporosis (weak bones)
• an unusual or allergic reaction to letrozole, other medicines, foods, dyes, or preservatives
• not finished menopause

How should I use this medicine?

Take this medicine by mouth with a glass of water. You may take it with or without food. Follow the directions on the prescription label. Take your medicine at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on your doctor's advice.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

What if I miss a dose?

If you miss a dose, 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.

What may interact with this medicine?

Do not take this medicine with any of the following:

• estrogens, like hormone replacement therapy or birth control pills

This medicine may also interact with the following:

• dietary supplements such as androstenedione or DHEA
• prasterone
• tamoxifen

This list may not describe all possible interactions. Give your health care providers a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What side effects may I notice from this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:

• allergic reactions like skin rash, itching, or hives
• bone fracture
• chest pain
• difficulty breathing or shortness of breath
• severe pain, swelling, warmth in the leg
• unusually weak or tired
• urinary tract infection
• vision or speech changes
• swelling of the ankles or feet

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

• bone, back, joint, or muscle pain
• dizziness
• flushing
• increased sweating
• headache
• hot flashes, night sweats
• loss of appetite
• nausea
• sleeplessness
• stomach pain
• tiredness or weakness
• weight gain or loss

This list may not describe all possible side effects.

What should I watch for while using this medicine?

Visit your doctor or health care professional for regular check-ups to monitor your condition.

Do not use this drug if you are pregnant. Serious side effects to an unborn child are possible. Talk to your doctor or pharmacist for more information.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells.

Where should I keep this medicine?

Store 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 out of the reach of children and away from pets.