Anastrozole is a third-generation non-steroidal aromatase inhibitor (AI) — the most widely used oestrogen management tool in both performance-enhancing and TRT contexts. Ultima-Anastro provides 1 mg pharmaceutical-grade Anastrozole per tablet in a 30-tablet presentation.
How Anastrozole Works
Testosterone and other aromatizable anabolic steroids are partially converted into oestradiol (oestrogen) by the aromatase enzyme. At elevated oestrogen levels, men experience water retention, increased blood pressure, mood changes, reduced libido, and — if oestrogen climbs high enough — gynecomastia (development of breast tissue).
Anastrozole works by binding competitively to the aromatase enzyme, blocking it from converting androgens into oestrogen. At a dose of 1 mg, Anastrozole suppresses oestradiol by approximately 80% in clinical settings. In practice, steroid users require much lower doses to achieve the target of keeping oestradiol in the 70–150 pmol/L range — enough to preserve joint health, mood and libido, while preventing excess.
When to Use Anastrozole
Anastrozole is not needed by everyone on testosterone. At TRT doses (100–200 mg/week), many men maintain acceptable oestradiol without an AI. The need for Anastrozole should be determined by symptoms and — ideally — bloodwork, not used prophylactically at a fixed dose.
Use Anastrozole if you experience:
- Water retention and bloating that worsens week by week
- Soft, puffy appearance under the skin
- Sensitive or itchy nipples (early gynecomastia warning sign)
- Elevated blood pressure associated with oestrogen-driven water retention
- Bloodwork showing oestradiol above 200 pmol/L with accompanying symptoms
Dosing — Getting It Right
The most common mistake with Anastrozole is over-suppression. Crashing oestrogen produces its own set of problems: aching joints, fatigue, poor mood, low libido, and impaired recovery — effects that are often confused with low testosterone.
On a cycle (e.g. 500 mg Testosterone Enanthate/week):
- Start conservatively: 0.25 mg every other day
- Adjust based on bloodwork and symptoms — increase to 0.5 mg EOD if oestrogen remains high, reduce if joints become painful or libido drops sharply
On TRT (100–200 mg/week):
- Many users do not need an AI at all
- If needed: 0.25 mg once or twice per week
- Always confirm oestradiol with bloodwork before starting and after each dose adjustment
The goal is not to eliminate oestrogen — it is to optimise it. Oestradiol plays important roles in male health including bone density, cardiovascular function, cognitive performance, and sexual function.
Anastrozole vs Other AIs
The two most commonly used AIs in bodybuilding are Anastrozole and Exemestane (Aromasin). Key differences:
- Anastrozole is non-steroidal and competitive — its suppression is reversible and its effect diminishes when stopped. It is available as oral tablets (convenient) and is easily titrated.
- Exemestane is steroidal and suicidal — it permanently inactivates the aromatase enzyme molecules it binds to. Some users prefer it for a more predictable oestrogen floor, and it has mild intrinsic androgenic activity.
For most users, Anastrozole is the more flexible and beginner-friendly choice.
Side Effects of Anastrozole
Side effects from Anastrozole are almost exclusively caused by over-suppression of oestrogen:
- Joint pain and dryness (most common complaint)
- Fatigue and low mood
- Reduced libido despite normal testosterone
- Long-term bone density reduction (at excessive doses or extended use)
These are avoided by using the lowest effective dose and monitoring oestradiol via bloodwork.
Storage
Store at room temperature (15–25°C), away from moisture and direct light. Keep out of reach of children.
