Letrozole Tablet Uses in Pakistan

Letrozole is prescribed in Pakistan for two distinct conditions — HR+ breast cancer and ovulation induction in PCOS/infertility. This guide covers all approved and off-label uses.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Uses

Quick Answer

Letrozole (Femara 2.5mg) is primarily used for hormone receptor-positive breast cancer in postmenopausal women and for ovulation induction in PCOS or infertility under gynaecologist supervision. It reduces estrogen levels by blocking the aromatase enzyme. Always take under specialist care.

Primary Uses at a Glance

Letrozole blocks the aromatase enzyme, reducing estrogen production in the body. ER+ breast cancer cells use estrogen as 'fuel' — letrozole cuts off that fuel to stop cancer growth. It is used in postmenopausal women in adjuvant, extended adjuvant, and metastatic settings.

As prescribed by oncologist — typically 2.5mg once daily. The oncologist decides based on staging, hormone receptor status, and medical history.

Gynaecologists in Pakistan prescribe letrozole very widely for PCOS and anovulatory infertility. It improves the ovarian response to FSH, inducing ovulation. This is technically an off-label use but is a well-established part of gynaecological practice both internationally and in Pakistan.

As prescribed by gynaecologist — timing and duration are decided by the doctor. Typically started on day 2 or 3 of the cycle for 5 days, with ultrasound monitoring. Do not start on your own under any circumstances.

In some endometriosis cases, a gynaecologist may prescribe letrozole — especially when ovulation induction is needed. This is a specialist decision.

Only under specialist supervision — dose and duration are determined by the doctor according to the endometriosis case.

Other Uses

Advanced/metastatic breast cancer (first-line in postmenopausal HR+ patients)

# Letrozole Tablet Uses in Pakistan

Letrozole is prescribed in Pakistan for two distinct conditions — HR+ breast cancer and ovulation induction in PCOS/infertility. This guide covers all approved and off-label uses.

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Letrozole Kis Tarah Kaam Karti Hai?

Letrozole is an aromatase inhibitor. It blocks the aromatase enzyme (CYP19A1) in the body — which converts androgens (such as testosterone) into estrogen.

Effect of estrogen blockade:

In breast cancer: ER+ cancer cells are cut off from estrogen "fuel" → cancer growth is halted
In PCOS / ovulation induction: a temporary drop in estrogen causes the pituitary to release more FSH → ovulation is stimulated

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Primary Uses (Mukhtalif Indications)

1. Hormone Receptor-Positive (HR+) Breast Cancer — Postmenopausal Khawateen

The most common type of breast cancer is hormone receptor-positive — meaning the cancer needs estrogen to grow. Letrozole drastically reduces estrogen levels to "starve" cancer cells.

Who takes it: Only postmenopausal women — the oncologist makes the judgement.

Settings:

Adjuvant: After surgery to prevent recurrence
Extended adjuvant: 5 years tamoxifen followed by a further 5 years letrozole
Metastatic / Advanced: When cancer has spread — as first-line treatment

Dose guidance (BNF): 2.5mg once daily — but the oncologist will determine your exact schedule.

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2. PCOS / Ovulation Induction (Off-Label — Gynaecologist Supervised)

Gynaecologists in Pakistan use letrozole very widely for PCOS and anovulatory infertility. This is technically an off-label use but is well-established in gynaecological practice.

Mechanism: Letrozole temporarily suppresses estrogen, inducing an FSH surge → ovulation is stimulated.

When it is prescribed:

PCOS patients in whom ovulation is not occurring
When there is no response to clomiphene citrate
Infertility treatment under gynaecologist supervision

Important: Only under gynaecologist supervision, with ultrasound monitoring — starting on your own is dangerous.

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3. Endometriosis-Associated Infertility (Off-Label)

In some endometriosis cases, a gynaecologist may prescribe letrozole when ovulation induction is needed. This is a specialist decision — the patient cannot decide this independently.

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4. Advanced / Metastatic Breast Cancer

For advanced or metastatic breast cancer in postmenopausal HR+ patients, letrozole is among the first-line treatment options. The oncologist decides based on disease extent and patient history.

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Kise Letrozole Nahi Leni Chahiye?

> CRITICAL SAFETY — Pregnancy: > Letrozole is ABSOLUTELY CONTRAINDICATED in pregnancy. It is highly teratogenic — it causes serious harm to the fetus. Even during fertility treatment, the doctor and patient work together with close monitoring. If pregnancy is suspected, see a doctor immediately and stop the medicine.

Contraindications:

Pregnant women — at any stage
Known allergy to letrozole or its ingredients
Premenopausal breast cancer
Breastfeeding — seek confirmation from a doctor

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Summary

Indication	Who Prescribes	Context
HR+ Breast Cancer (adjuvant/metastatic)	Oncologist	Postmenopausal only
PCOS / Ovulation Induction	Gynaecologist	Off-label, widely practiced
Endometriosis infertility	Gynaecologist	Off-label, specialist decision

Letrozole is a potent medicine. Whether for breast cancer or PCOS — always take under doctor supervision. Never self-medicate.

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[Letrozole Dosage Guide](/medicines/letrozole-tablet/dosage)
[Letrozole Side Effects](/medicines/letrozole-tablet/side-effects)
[Letrozole Price in Pakistan](/medicines/letrozole-tablet/price-in-pakistan)

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Disclaimer

The information on this page is for awareness only. It is not medical advice. Always consult your doctor or pharmacist before taking any medicine. PakVita is not responsible for any harm.

Frequently Asked Questions

Letrozole kya breast cancer ke liye hai ya PCOS ke liye?

It is used for both — but different specialists prescribe it in different contexts. For breast cancer, an oncologist prescribes it to postmenopausal women. For PCOS or ovulation induction, a gynaecologist prescribes it to premenopausal women. In both cases, doctor supervision is essential.

Letrozole kis kaam aati hai Pakistan mein?

Letrozole is prescribed in Pakistan for two main uses: (1) for HR+ breast cancer in postmenopausal women under oncologist supervision; (2) for PCOS or anovulatory infertility under gynaecologist supervision for ovulation induction. Do not take without a doctor.

PCOS mein letrozole kab aur kaise leni chahiye?

In PCOS, letrozole is taken only as directed by a gynaecologist. Typically it is started on day 2 or 3 of the menstrual cycle and continued for 5 days — but the exact schedule, dose, and ultrasound monitoring are all decided by the doctor. Starting on your own is dangerous.

Kya letrozole pregnancy mein li ja sakti hai?

Absolutely not. Letrozole is absolutely contraindicated in pregnancy — it is highly teratogenic and can cause serious harm to the fetus. Even during fertility treatment, the doctor monitors closely and stops the medicine once pregnancy is confirmed. If pregnancy is suspected, see a doctor immediately.

Kya letrozole breast cancer mein permanent hai ya limited time ke liye?

This is decided by the oncologist — generally 5 years in the adjuvant setting or longer in extended adjuvant, and for as long as it is beneficial in the metastatic setting. Do not stop on your own — follow the plan with your doctor.

Brand alternatives, same-class options, and other medicines used for the same conditions as Letrozole Tablet.

Used for the same conditions

Other medicines commonly used for pcos (polycystic ovary syndrome) and overlapping conditions.

PCOS (Polycystic Ovary Syndrome) hub →

Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.