What is Anastrozole 1 (Astera Labs)?
Astera Labs anastrozole in 1mg tablets, 50 to a sachet. The standard on-cycle aromatase inhibitor, and the one most likely to be dosed too high.
Also sold as Arimidex, Anastrozol or anastrozole.
Anastrozole is a non-steroidal aromatase inhibitor. It sits on the aromatase enzyme and blocks it competitively, which stops testosterone converting to estrogen. The binding is reversible, so the effect fades as it clears and estrogen comes back up.
Anastrozole 1 benefits
- Reliable, predictable estrogen control on cycle, the most widely used option here
- Long half-life, so every other day dosing holds levels steady
- Reversible binding, so the effect fades rather than persisting if you stop
- Well documented, with more accumulated user experience than the alternatives
- 1mg tablets, which split cleanly into the 0.5mg most protocols actually use
Anastrozole dosage
- Common starting point
- 0.25 to 0.5mg every other day
- Higher end
- 1mg every other day
- Adjust from
- An estradiol blood test, not from symptoms
- Frequency
- Every other day
- Half-life
- About 46 hours
- Post-cycle therapy
- Do not use, switch to a SERM
Most people sit at a quarter to half a tablet every other day. Starting at a whole tablet because that is what the tablet is, is one of the commonest routes to crashed estrogen.
Adjust from a blood test. High and low estrogen produce almost identical symptoms.
Package content
- Tablets
- 50 per sachet
- Strength
- 1mg anastrozole per tablet
- Anastrozole per sachet
- 50mg
- Half-life
- About 46 hours
- Brand
- Astera Labs
At 0.5mg every other day one sachet covers around 200 days.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Anastrozole 1 for?
Anyone running a compound that aromatises whose bloodwork says estrogen is climbing.
ARIMIMED 1 is the same 1mg, the same 50 tablets, at the same price from Deus Medical. Choose on packaging alone. If you are also running tamoxifen, exemestane is the better choice.
How to use Anastrozole 1
Swallow with water, every other day at the same time. Split tablets with a pill cutter for the quarter and half doses most protocols use. Stop it when the cycle ends.



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