About
Letrozole is a highly selective, non-steroidal aromatase inhibitor primarily used in the treatment of hormone receptor-positive breast cancer in postmenopausal women. Its mechanism of action involves competitively binding to the heme of the cytochrome P450 subunit of the aromatase enzyme, thereby inhibiting the conversion of androgens (like androstenedione and testosterone) into estrogens (estrone and estradiol). This significant reduction in circulating estrogen levels deprives estrogen-dependent breast cancer cells of the growth stimulus, leading to tumor regression or prevention of recurrence. Letrozole is a potent agent, capable of achieving greater than 90% suppression of estrogen synthesis. It is administered orally and is a cornerstone in both adjuvant and metastatic settings for estrogen receptor-positive breast cancer, demonstrating superior efficacy compared to tamoxifen in certain patient populations.
Uses
- Adjuvant treatment of early breast cancer
- Extended adjuvant treatment of early breast cancer
- First-line treatment of advanced breast cancer
- Treatment of advanced breast cancer after antiestrogen therapy
Directions For Use
Take one tablet orally once daily, with or without food, as prescribed by your doctor.
Benefits
- Highly effective in reducing estrogen levels
- Prevents recurrence of breast cancer
- Improves disease-free survival
- Well-tolerated in many patients
- Oral administration
- Can be used in various stages of breast cancer
Side Effects
- Hot flashes
- Joint pain (arthralgia)
- Fatigue
- Nausea
- Headache
- Dizziness
- Bone thinning (osteoporosis)
- Sweating
- Weight gain
- Hair thinning
- Muscle pain
- Elevated cholesterol
Safety Measures
- Alcohol - No specific contraindication, but excessive alcohol can worsen hot flashes or fatigue.
- Pregnancy - Contraindicated in pregnancy due to potential for fetal harm. Effective contraception is essential.
- Breastfeeding - Not recommended during breastfeeding due to potential harm to the infant and unknown excretion into milk.
- Liver - Use with caution in patients with severe liver impairment; dose adjustment may be necessary.
- Kidney - Generally no dose adjustment needed for mild to moderate renal impairment; use with caution in severe impairment.
- Lung - No specific lung-related safety concerns are widely reported for letrozole.
Disclaimer
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