Letrozole Uses, Side Effects, Dosage, and Price in Pakistan (2026)
Letrozole is a prescription medicine that belongs to a class of drugs known as aromatase inhibitors. It is widely used to treat hormone receptor-positive breast cancer in postmenopausal women by lowering the amount of estrogen the body produces. In recent years, doctors have also prescribed Letrozole for certain fertility treatments, particularly for women with polycystic ovary syndrome (PCOS) or ovulation disorders. Although this fertility use is considered off-label in many countries, it has become a common medical practice under specialist supervision.
Because Letrozole affects hormone levels, it should only be taken under the guidance of a qualified healthcare professional. Self-medication can increase the risk of side effects or reduce the effectiveness of treatment.
What Is Letrozole?
Letrozole is an oral medication available primarily as a 2.5 mg tablet. It works by blocking the aromatase enzyme, which is responsible for converting androgens into estrogen. Lower estrogen levels slow or stop the growth of certain breast cancer cells that depend on estrogen for survival.
Doctors may also prescribe Letrozole to stimulate ovulation in women experiencing infertility, especially when other medications such as clomiphene have not produced the desired results. Clinical experience has shown that Letrozole can help many women ovulate while reducing the risk of multiple pregnancies compared to some alternative fertility medicines.
Medical Uses of Letrozole
Breast Cancer Treatment
The primary approved use of Letrozole is the treatment of hormone receptor-positive breast cancer in postmenopausal women. It may be prescribed:
- After surgery to reduce the risk of cancer returning.
- As the first treatment for advanced breast cancer.
- When breast cancer has spread to other parts of the body.
- After tamoxifen therapy in selected patients.
By reducing estrogen production, Letrozole deprives cancer cells of the hormone they need to grow.
Fertility and Ovulation Induction
Another important use of Letrozole is fertility treatment. Gynecologists commonly prescribe it for women who:
- Have PCOS.
- Experience irregular ovulation.
- Have unexplained infertility.
- Need ovulation induction before intrauterine insemination (IUI).
Letrozole for PCOS
Women with PCOS often do not release eggs regularly. Letrozole encourages the ovaries to produce mature follicles, increasing the chance of natural conception. Treatment usually begins early in the menstrual cycle and is monitored through ultrasound and hormone testing.
Recommended Dosage
The dosage depends entirely on the medical condition being treated.
| Condition | Typical Dosage |
|---|---|
| Breast cancer | 2.5 mg once daily |
| Fertility treatment | Usually 2.5–7.5 mg daily for 5 days, depending on specialist advice |
Never change your dose without consulting your doctor. The correct dosage varies according to age, medical history, liver function, and treatment response.
Common Side Effects
Like all medicines, Letrozole can cause side effects. Most are mild and improve as the body adjusts.
Mild Side Effects
Common side effects include:
- Hot flashes
- Headache
- Fatigue
- Joint pain
- Muscle pain
- Nausea
- Dizziness
- Sweating
- Hair thinning
- Mild weight changes
These effects are generally manageable but should be discussed with your healthcare provider if they become severe.
Serious Side Effects
Seek medical attention immediately if you experience:
- Chest pain
- Shortness of breath
- Severe allergic reaction
- Bone fractures
- Persistent bone pain
- Signs of stroke
- Severe swelling
- Vision changes
Long-term treatment may reduce bone density and increase the risk of osteoporosis, so doctors sometimes recommend calcium, vitamin D, or bone density monitoring.
Who Should Avoid Letrozole?
Letrozole may not be suitable for everyone. Inform your doctor if you:
- Are pregnant or planning pregnancy.
- Are breastfeeding.
- Have severe liver disease.
- Have osteoporosis.
- Have high cholesterol.
- Have experienced allergic reactions to Letrozole.
Women taking Letrozole for fertility should follow their doctor’s instructions carefully regarding pregnancy testing and treatment timing.
Drug Interactions
Tell your healthcare provider about all medicines, vitamins, and herbal supplements you take.
Possible interactions may occur with:
- Estrogen-containing medicines
- Hormone replacement therapy
- Tamoxifen
- Certain prescription hormone medications
Always consult your physician before combining medications.
Price of Letrozole in Pakistan (2026)
The price varies depending on the manufacturer, brand, pack size, and pharmacy.
| Brand | Approximate Price |
|---|---|
| Generic Letrozole (lowest-priced brands) | From Rs. 200 |
| Letara 2.5 mg | Around Rs. 1,700–2,000 |
| Aromek 2.5 mg | Around Rs. 790 |
| Femara 2.5 mg (Novartis) | Around Rs. 10,000 |
Prices may differ by city and pharmacy, so it is advisable to confirm the current retail price before purchasing.
Storage Instructions
Store Letrozole:
- At room temperature.
- Away from direct sunlight.
- In a dry place.
- Out of reach of children.
- In its original packaging.
Do not use expired medicine.
Conclusion
Letrozole is an effective medication for treating hormone-sensitive breast cancer and is also widely used by fertility specialists to help women with ovulation problems, including those with PCOS. While many patients benefit from this medicine, it can cause side effects such as hot flashes, fatigue, and joint pain. Long-term users may require bone health monitoring because reduced estrogen levels can affect bone density. Always take Letrozole exactly as prescribed and never start or stop treatment without medical advice. If you have concerns about side effects or the cost of treatment, discuss them with your healthcare provider or pharmacist before making any changes.
Frequently Asked Questions (FAQs)
1. What is Letrozole mainly used for?
It is primarily used to treat hormone receptor-positive breast cancer in postmenopausal women and is also commonly prescribed to induce ovulation in women with infertility.
2. Can Letrozole help women with PCOS?
Yes. Many fertility specialists prescribe Letrozole to stimulate ovulation in women with PCOS under medical supervision.
3. What are the most common side effects?
Hot flashes, headache, fatigue, joint pain, nausea, dizziness, and muscle aches are among the most common side effects.
4. Is Letrozole safe during pregnancy?
No. Letrozole should not be used during pregnancy unless specifically directed by a specialist for fertility treatment before conception.
5. How much does Letrozole cost in Pakistan?
Depending on the brand, prices range from approximately Rs. 200 for some generic brands to around Rs. 10,000 for the branded product Femara.