What Letrozole is

Class and mechanism

Letrozole is a Non-steroidal aromatase inhibitor. A reversible competitive aromatase inhibitor, the most potent of the non-steroidal class in published suppression comparisons.

Where it sits

Post-cycle and hormonal support compounds fall into two families that are often confused: SERMs act at the oestrogen receptor, aromatase inhibitors reduce the conversion of androgens to oestrogen upstream.

Other names

Letrozole is also written as Femara. The same molecule appears under more than one name, which is worth knowing when comparing listings between suppliers.

Others in the post-cycle and hormonal support range

Letrozole sits in the post-cycle and hormonal support group. The compounds below share that grouping, which is the useful starting point when comparing one against another: same group means the comparison is like for like, different group usually means it is not.