PCT & AI Arimidex (Anastrozole)
- Form
- Tab
- Sizes
- 1mg × 100 Tabs, 0.5mg × 100 Tabs
- Price (per bottle)
- 45 - 80 EUR
Product Comparison
Arimidex (Anastrozole) vs Letrozol (Femara)
The two most-used AIs. Letrozole more potent (~98% E2 reduction) than Anastrozole (~80%). Crash risk correspondingly higher.
PCT & AI 
PCT & AI Letrozol (Femara)
- Form
- Tab
- Sizes
- 2.5mg × 100 Tabs, 2.5mg × 30 Tabs, 2.5mg × 10 Tabs
- Price (per bottle)
- 20 - 100 EUR
By the numbers
Number of sizes Arimidex (Anastrozole): 2 Letrozol (Femara): 3
Smallest size Arimidex (Anastrozole): 0.5 mg Letrozol (Femara): 2.5 mg
Largest size Arimidex (Anastrozole): 1 mg Letrozol (Femara): 2.5 mg
Price from (per bottle) Arimidex (Anastrozole): 45 EUR Letrozol (Femara): 20 EUR
Price up to (per bottle) Arimidex (Anastrozole): 80 EUR Letrozol (Femara): 100 EUR
Values from the sizes and catalogue prices on this page, without Express and discounts.
Half-life compared
How quickly do they break down?
Share left after one dose, calculated from the half-lives in the lexicon
Arimidex (Anastrozole)~2 daysLetrozol (Femara)~3 days
Half-life = 50 %
Day 6 after the dose
Letrozol (Femara)25 %
Arimidex (Anastrozole)12.5 %
| Product | Half-life | Day 7 | Day 14 | Day 28 |
|---|---|---|---|---|
| Letrozol (Femara) | ~3 days | 19.8 % | 3.9 % | 0.2 % |
| Arimidex (Anastrozole) | ~2 days | 8.8 % | 0.8 % | < 0.1 % |
Simplified model without an absorption phase, half-lives from the TPD lexicon.
| Feature | Arimidex (Anastrozole) | Letrozol (Femara) |
|---|---|---|
| Category | PCT & AI | PCT & AI |
| Subcategory | Post-Cycle & Aromatase Inhibitors | Post-Cycle & Aromatase Inhibitors |
| Form | Tab | Tab |
| Price range | 45 - 80 EUR | 20 - 100 EUR |
| GLP-1 | No | No |
Quick reference
What both have in common
- Same subcategory: Post-Cycle & Aromatase Inhibitors - addressed via overlapping mechanisms.
- Same main category: PCT & AI / PCT & AI
This page is a high-level comparison for community discussion only. Refer to the linked detail pages for full descriptions, risk profiles and peer-reviewed studies. Not medical advice.
