Details
What is Anastrozole?
Anastrozole is a prescription medicine originally developed to treat breast cancer in post-menopausal women. It works by lowering estrogen levels in the body. In the fitness world, it's widely used to keep estrogen in check during steroid cycles.
Quick Facts
| Active Ingredient | Anastrozole |
| Half-life | ~46 hours |
| Form | Oral tablet |
| Dose (Men) | 0.5mg every other day – 1mg daily |
| Dose (Women) | 1mg daily (medical use only) |
| Detection Time | ~2 weeks |
| Anabolic Rating | N/A |
| Androgenic Rating | N/A |
How Does It Work?
Anastrozole is an aromatase inhibitor, meaning it blocks the enzyme responsible for converting testosterone into estrogen. Less aromatase activity means less estrogen circulating in the body. This helps prevent estrogen-related side effects that can come with anabolic steroid use.
What It's Used For
- Controlling estrogen levels during anabolic steroid cycles
- Preventing gynecomastia (breast tissue growth in men)
- Reducing water retention caused by high estrogen
What to Expect
Within a few days of starting anastrozole, estrogen levels begin to drop noticeably. You should see less bloating and reduced water retention fairly quickly. It won't build muscle on its own, but it keeps your cycle running cleaner and more comfortably.
Possible Side Effects
- Joint pain and stiffness from low estrogen
- Fatigue and low mood if estrogen drops too far
- Reduced bone density with long-term use
Cycle & Dosage Notes
Most users start at 0.5mg every other day and adjust based on how they feel and their bloodwork results. It's typically run alongside aromatising compounds like testosterone throughout the cycle. Crashing estrogen too low is a real risk, so blood tests are strongly recommended to dial in the right dose.
Storage
Keep at room temperature (15–25°C), away from light and moisture. Leave in the original packaging.
This info is for research and educational purposes only. Check the laws in your country before ordering.
