Letrozole
About Letrozole
Letrozole is a prescription oral tablet used primarily to treat certain types of breast cancer in women who have already gone through menopause. It is specifically prescribed for hormone-receptor-positive breast cancers, which rely on hormones to grow. By lowering hormone levels in the body, this medicine helps slow down or stop the growth of cancer cells.
For this medication to work effectively, you must take it consistently at the same time every day. You can take this tablet with or without food, as eating does not affect how the medicine is absorbed. Combining this treatment with a balanced diet and regular physical activity can help support your body and manage potential side effects.
While taking Letrozole, you may experience mild side effects such as hot flashes, joint pain, or feeling unusually tired. While these are common, you should contact your doctor right away if you experience serious symptoms like severe chest pain, sudden shortness of breath, or signs of liver damage such as yellowing of your eyes or skin.
Do not take this if you are pregnant, breastfeeding, or have not yet gone through menopause. It is important to talk to your doctor before starting this medicine if you have a history of bone loss, high cholesterol, liver problems, or severe kidney disease.
This medicine can interact with other treatments, especially therapies that contain oestrogen, such as birth control pills or hormone replacement therapy, which can make this medication less effective. Older adults can safely take this medication, but your doctor will monitor your health closely during treatment to ensure your safety.
Uses of Letrozole
• Breast Cancer Treatment: Letrozole is primarily prescribed for postmenopausal women with hormone-receptor-positive breast cancer. It works by lowering estrogen levels, which helps slow or halt the growth of certain breast tumors.
• Adjuvant Therapy: After surgery for early-stage breast cancer, Letrozole may be used as adjuvant therapy to reduce the risk of recurrence and improve survival rates.
• Neoadjuvant Therapy: Letrozole can serve as a neoadjuvant treatment to shrink breast tumors before surgery, facilitating their removal.
• Ovarian Function Suppression: Letrozole is occasionally used off-label during fertility treatments to suppress ovarian function, particularly in cases of polycystic ovary syndrome (PCOS).
Medicinal Benefits
Letrozole helps manage hormone-sensitive breast cancer by lowering oestrogen levels in the body, reducing the signals that encourage cancer cells to grow. By supporting both treatment and long-term disease control, this medicine offers several key benefits:
- Helps Reduce the Risk of Cancer Recurrence: For patients who have completed initial breast cancer treatment, Letrozole helps lower the risk of the cancer returning. By reducing oestrogen levels, it helps limit the growth of hormone-sensitive cancer cells and supports long-term treatment outcomes.
- Supports Control of Advanced Breast Cancer: In patients with advanced breast cancer, this medicine can help slow tumour growth or reduce tumour size. This may help control disease progression and support ongoing cancer management.
- Helps Maintain Quality of Life: By helping manage cancer growth and related symptoms, Letrozole can support greater physical comfort and daily functioning. This may allow patients to continue their usual activities with improved confidence and well-being during treatment.
Directions for Use
To get the most benefit from this medicine, follow these instructions carefully:
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet.
- You can take this medication with or without food.
- Try to take your dose at the same time every day to keep a steady amount of the medicine in your body.
- Always follow your doctor's exact instructions regarding how long you should continue taking this medicine, as cancer therapies are often long-term treatments.
Storage
Side Effects of Letrozole
Like all medicines, this medication can cause side effects, though not everyone experiences them.
Common Side Effects (Usually mild):
- Hot flashes and increased sweating
- Joint stiffness, muscle pain, or bone pain
- Feeling unusually tired or weak
- Headaches or dizziness
- Increased cholesterol levels
Serious Side Effects (Call a doctor right away):
- Signs of a blood clot, such as sudden swelling, pain, or warmth in one leg
- Chest pain, sudden coughing, or difficulty breathing
- Signs of liver damage, including dark urine, pale stools, or yellowing of the skin and eyes
- Severe bone pain or a fracture from a minor fall (which may point to severe bone thinning)
- Signs of a severe allergic reaction, such as swelling of the face, lips, or throat, or a severe skin rash
Medicines Containing this Salt
View All
Drug Warnings
- Inspect your tablet before taking it; do not use it if the packaging is damaged or the tablet looks broken.
- Do not take this medication if you are pregnant, as it can cause serious harm to an unborn baby. Use reliable, non-hormonal birth control during treatment.
- This medication can cause dizziness or fatigue; avoid driving or operating heavy machinery until you know how it affects you.
- Be sure to attend all scheduled medical appointments so your doctor can monitor your bone density and cholesterol levels.
Drug Interactions
Drug-Drug Interactions
- Oestrogen-containing therapies: Medicines like birth control pills, oestrogen creams, or hormone replacement therapies can reverse the effects of Letrozole and should be avoided.
- Tamoxifen: Taking this medication alongside tamoxifen can lower the level of Letrozole in your body, making it less effective.
Drug-Disease Interactions
- Osteoporosis: This medicine lowers oestrogen levels, which can accelerate bone thinning and increase your risk of fractures.
- Liver Disease: If you have moderate to severe liver damage, your body may process this medication more slowly, requiring closer monitoring by your doctor.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeYou are recommended to avoid alcohol consumption while taking Letrozole to avoid unpleasant side effects. Alcohol intake, along with Letrozole, may cause increased drowsiness.
Pregnancy
unsafeLetrozole is pregnancy category D medicine so, should not be taken during pregnancy.
Breast Feeding
unsafeLetrozole should not be taken during breastfeeding as it passes into the breastmilk and may harm the nursing baby.
Driving
unsafeLetrozole may cause dizziness and drowsiness, do not drive or operate heavy machinery if you feel dizzy.
Liver
safe if prescribedIt is safe to take Letrozole if prescribed. Please consult your doctor if you have a liver impairment or any concerns regarding this.
Kidney
safe if prescribedIt is safe to take Letrozole if prescribed. Please consult your doctor if you have kidney impairment or any concerns regarding this.
Children
unsafeLetrozole should not be used by children, as the efficacy and safety have not been established.
Habit Forming
Diet & Lifestyle Advise
- Protect your bones: Because this medicine lowers oestrogen, it can reduce bone density. Ask your doctor about taking calcium and vitamin D supplements to help keep your bones strong.
- Stay active: Engage in regular, weight-bearing exercises like walking or light strength training to maintain bone strength and reduce joint stiffness.
- Monitor your cholesterol: Eat a heart-healthy diet rich in fibre, vegetables, and lean proteins, as this medicine can sometimes increase blood cholesterol levels.
- Stay hydrated: Drink plenty of water throughout the day, which can help manage fatigue and reduce the intensity of hot flashes.
Special Advise
- Your doctor may advise you to regularly measure bone density before, during and after the treatment as Letrozole may cause bone thinning due to reduction of estrogens in the body.
- Letrozole should be taken under strict medical supervision. The doctor will regularly monitor your condition while taking Letrozole.
Patients Concern
Disease/Condition Glossary
Breast cancer: It is a type of cancer that develops in breast cells which are stimulated by the female sex hormone called estrogen. Breast cancer may form in lobules (glands that produce milk), ducts of the breast (the pathway that brings milk from glands to the nipple), and in the fatty tissue or the fibrous connective tissue within the breast. The tumour cells invade other healthy breast cells and can travel to lymph nodes which are a primary pathway for the cancer cells to move to other parts of the body. Symptoms of breast cancer include a lump in the breast or tissue thickening which feels different than the normal surrounding tissues, breast pain, redness, swelling, nipple discharge other than breast milk, bloody discharge, unexplained change in shape, size or appearance of the breast, peeling, flaking or scaling of the skin, and a lump or swelling under the arm.
FAQs
Letrozole is an anti-cancer medicine used to treat hormone receptor-positive breast cancer, particularly in women who have gone through menopause. It helps slow or stop the growth of cancer cells by reducing estrogen production in the body.
Letrozole works by blocking the aromatase enzyme, which is involved in the production of estrogens. The cancer cells require estrogen for their growth, so by blocking the enzyme Letrozole prevents the growth of cancer cells. Thereby, Letrozole helps in slowing down or stopping the growth and/or spreading the tumours to other body parts.
Letrozole causes dizziness and drowsiness. So, drive only if you are alert and omit driving or operating machinery if you feel dizzy or drowsy.
High blood pressure could be a side-effect of Letrozole. Regularly monitor blood pressure levels while taking Letrozole. Consult your doctor if you regularly notice high blood pressure levels.
Do not stop taking Letrozole on your own. You are advised to take Letrozole for as long as your doctor has prescribed it for you depending on your medical condition. Do not be reluctant to speak with your doctor if you experience any difficulty while taking Letrozole.
Letrozole may cause osteoporosis (bone thinning) due to the reduction of estrogen in the body. Regular bone density tests may help you monitor osteoporosis. Contact your doctor if you observe any sign of tendon pain or swelling while taking Letrozole.
Some people may experience weight changes while taking Letrozole. Weight gain may occur due to changes in metabolism, appetite, or reduced physical activity. Maintaining a balanced diet and regular exercise may help manage weight. Consult your doctor if you notice significant weight changes.
Letrozole should be swallowed as a whole with water; do not crush or chew it.
Letrozole can be taken with or without food.
Letrozole may cause high blood pressure. Therefore, irbesartan should be taken with Letrozole only if prescribed by the doctor. Regularly monitor blood pressure levels while taking Letrozole.
Letrozole may cause eye problems like blurred vision and cataracts. Consult the doctor if you experience blurred vision or eye irritation.
Letrozole may cause hot flushes leading to sweating. These symptoms usually improve during the first few months. However, if the symptoms persist or worsen, consult the doctor.
Serious side effects of Letrozole are difficulty breathing, chest pain, fainting, rapid heart rate, formation of blood clots (bluish skin discolouration, or sudden arm, leg or foot pain) and rupture of a tendon. These side effects are rare and may not occur in everyone taking Letrozole.
Letrozole may induce ovulation in anovulatory infertility patients and augment follicles for ovulatory women. However, it is an off-label use. Talk to the doctor if you have any concerns.
Letrozole is not recommended for use during pregnancy or while breastfeeding.
The time required for Letrozole to show its effects depends upon your condition and severity. Consult the doctor if you have any concerns.
If you miss a dose of Letrozole take it as soon as you remember, However, if it is almost time for the scheduled dose, skip the missed dose and take the next dose at the scheduled time.
Letrozole may interact with antidepressants (citalopram, escitalopram) and anticancer medicines (tamoxifen). Let the doctor know if you are taking these medicines.
Store Letrozole at room temperature, in a dry place. Keep out of sight and reach of children.
No, this medication is designed only for women who have fully gone through menopause. If your ovaries are still producing oestrogen, this medicine will not work as intended. Talk to your doctor if you are unsure of your menopausal status.
The duration of treatment varies depending on your specific diagnosis. It is commonly prescribed for 5 to 10 years to prevent cancer recurrence. Always follow your doctor's recommendations.
Moderate alcohol consumption is generally safe, but excessive drinking can worsen side effects like hot flashes, fatigue, and bone thinning. Discuss your alcohol intake with your doctor.
Some patients experience mild hair thinning or changes in hair texture due to lowered oestrogen levels. If this becomes severe or distressing, talk to your doctor.
Mild joint stiffness is common, but severe pain should be evaluated. Do not start taking over-the-counter pain relievers without consulting your doctor first, as they can recommend the safest option for you.
You can take this medicine at either time, but it is best to take it at the same time every day. If you find it makes you feel tired, taking it before bed may help. Consult your pharmacist for personalised advice.
Yes, your doctor will likely order periodic blood tests to monitor your cholesterol levels and liver function, as well as bone density scans to protect your bone health. Talk to your doctor to understand your monitoring schedule.
