Letrozole (Femara)
4-[bis(4-cyanophenyl)methyl]-1,2,4-triazole. Aromatase Inhibitor (AI), non-steroidal ai.
This page describes what Letrozole (Femara) is and its known risks. It is not medical advice and not a guide to using it. Many of these substances are prescription-only or illegal to use without a prescription. Speak to a doctor.
- Class
- Aromatase Inhibitor (AI)
- Legal status
- Prescription only
- Half-life
- 2 days
- Liver strain
- Low
- Kidney strain
- Low
- Converts to estrogen
- None
- Suppresses natural hormones
- Not typically
Medical uses
- Breast cancer treatment (postmenopausal women)
What it does in the body
Anti-estrogenic
- Extremely potent aromatase inhibition
- Drastically reduces estrogen
- Treats existing gynecomastia
- Reduces water retention
Forms, half-life and detection
| Form | Half-life | Reported detection window |
|---|---|---|
| Oral | 2 days | Not tested |
Side effects and health risks
Hormones and fertility
- Crashed estrogen (very common if not dosed carefully)
- Severe joint pain
- Severe libido loss
- Erectile dysfunction
Musculoskeletal
- Severe joint pain and stiffness
- Bone density loss
Heart and blood vessels
- Severe negative lipid changes
Mood and mind
- Severe depression
- Mood swings
- Lethargy
Related compounds
Questions
What is the half-life of Letrozole (Femara)?
About 2 days. Half-life is the time for the level in the blood to fall by half.
How long is Letrozole (Femara) detectable?
Testing windows of Not tested are reported, depending on the test and the person.
Is Letrozole (Femara) legal?
Prescription only. Laws differ by country and change; check the rules where you live.
What blood tests matter with Letrozole (Femara)?
Ask a doctor which tests suit you.
What are the side effects of Letrozole (Femara)?
Hormones and fertility: crashed estrogen (very common if not dosed carefully), severe joint pain and severe libido loss. Musculoskeletal: severe joint pain and stiffness and bone density loss. Heart and blood vessels: severe negative lipid changes.
For information only, not medical advice. MyoStats is a tracking tool used at your own discretion. Speak to a doctor before changing your training, diet, medication or anything you take.