What Is Letrozole?
Letrozole, sold under the brand name Femara, is a non-steroidal aromatase inhibitor (AI) that reduces estrogen levels by blocking the enzyme aromatase. This enzyme is responsible for converting androgens (like testosterone) into estrogen. Letrozole is commonly used in hormonal therapy, especially for post-cycle therapy (PCT) or managing estrogen-related side effects from steroids or other performance-enhancing drugs (PEDs).
At 2.5mg per tablet, Letrozole is typically prescribed for treating breast cancer in women, but bodybuilders use it to prevent estrogenic side effects such as gynecomastia (man boobs), water retention, and bloating.
💊 Dosage Guidelines
| Use Case | Dosage (Daily) | Notes |
|---|---|---|
| Estrogen Control (on-cycle) | 2.5mg every other day | Start low, adjust based on estrogen levels |
| Gynecomastia Prevention | 2.5mg every other day | Typically sufficient for most users |
| Post-Cycle Therapy (PCT) | 2.5mg every day (early phase) | Adjust dosage based on recovery needs |
| Estrogenic Side Effects | 1.25–2.5mg every other day | Taper off once symptoms subside |
🕒 Half-Life: 2–4 days
💊 Frequency: Usually every other day to avoid over-suppressing estrogen
🔬 Monitor Estrogen: Always get bloodwork to ensure you’re not over-suppressing estrogen (can lead to joint pain, fatigue, etc.)
💪 Benefits of Letrozole (Femara) 2.5mg
| Benefit | Intensity |
|---|---|
| Reduces Estrogenic Sides | ⭐⭐⭐⭐⭐ |
| Prevents Gynecomastia | ⭐⭐⭐⭐⭐ |
| Prevents Water Retention | ⭐⭐⭐⭐⭐ |
| Clears Bloat/Hardens Muscles | ⭐⭐⭐⭐ |
| Supports Natural Testosterone Production | ⭐⭐⭐⭐ |




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