What Tamoxifen is
Tamoxifen is a selective oestrogen receptor modulator (SERM). A triphenylethylene SERM: antagonist at breast tissue oestrogen receptors, agonist at others including bone and liver. Blocks hypothalamic oestrogen negative feedback, raising LH and FSH output.
Class and mechanism
Tamoxifen is a selective oestrogen receptor modulator (SERM). A triphenylethylene SERM: antagonist at breast tissue oestrogen receptors, agonist at others including bone and liver. Blocks hypothalamic oestrogen negative feedback, raising LH and FSH output.
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
Tamoxifen is also written as Nolvadex and Nolva. 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
Tamoxifen 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.
| Compound | Class | Listings | From |
|---|---|---|---|
| HCG | Gonadotropin analogue | 2 | £25 |
| Clomid | Selective oestrogen receptor modulator (SERM) | 1 | £22 |
| Arimidex | Non-steroidal aromatase inhibitor | 1 | £25 |
| Aromasin | Steroidal (suicidal) aromatase inhibitor | 1 | £35 |
| Letrozole | Non-steroidal aromatase inhibitor | 1 | £25 |
| HMG | Gonadotropin preparation | 1 | £35 |
Tamoxifen - PHARMAin stock£22- Quanta Pharma Tamoxifen 20mgout of stock£25
Availability checked 2026-09-09. The product page carries live stock.