What is the half-life of Tamoxifen?

Tamoxifen has an approximate elimination half-life of 5.4 d. Long-acting — weekly dosing keeps levels steady.

How long does Tamoxifen stay in your system?

Roughly 97% of a dose has cleared after five half-lives — about ~4 weeks for Tamoxifen. That is the window that matters for washouts, bloodwork and surgery.

How is Tamoxifen taken?

Tamoxifen is typically administered by the oral route. PCT literature: 20 mg oral daily, tapering to 10 mg over ~4 weeks.

What are the risks of Tamoxifen?

Can raise the risk of blood clots; caution with clotting history Mood changes, hot flashes, and vision changes are reported Prescription medicine — dose and duration should be clinician-guided

Tamoxifen

SERM (Nolvadex). Blocks estrogen at the breast + restarts the HPG axis in post-cycle protocols.

Half-life: 5.4 d
Out of system: ~4 weeks
Route: Oral
Level: Advanced

Long-acting — weekly dosing keeps levels steady. After the last dose, roughly 97% has cleared in ~4 weeks (five half-lives) — the window that matters for washouts, bloodwork and surgery.

What Tamoxifen is used for

Restarts natural testosterone after a steroid cycle (post-cycle therapy)
Blocks estrogen at breast tissue — treats/prevents gyno
Decades of clinical use and a well-characterised safety profile

How it's typically used

PCT literature: 20 mg oral daily, tapering to 10 mg over ~4 weeks.

What to watch for

Can raise the risk of blood clots; caution with clotting history
Mood changes, hot flashes, and vision changes are reported
Prescription medicine — dose and duration should be clinician-guided

Common questions

What is the half-life of Tamoxifen?: Tamoxifen has an approximate elimination half-life of 5.4 d. Long-acting — weekly dosing keeps levels steady.
How long does Tamoxifen stay in your system?: Roughly 97% of a dose has cleared after five half-lives — about ~4 weeks for Tamoxifen. That is the window that matters for washouts, bloodwork and surgery.
How is Tamoxifen taken?: Tamoxifen is typically administered by the oral route. PCT literature: 20 mg oral daily, tapering to 10 mg over ~4 weeks.
What are the risks of Tamoxifen?: Can raise the risk of blood clots; caution with clotting history Mood changes, hot flashes, and vision changes are reported Prescription medicine — dose and duration should be clinician-guided

About Ancillaries (SERMs / AIs)

What they are: Support drugs — SERMs, aromatase inhibitors, and prolactin controls used to manage the side effects of androgen use or to restart natural production afterwards.
How they're run: Oral tablets, dosed against bloodwork rather than on a fixed schedule.
What to watch: These are only meaningful with labs in hand. Crushing oestrogen with an AI wrecks joints, libido, and lipids just as thoroughly as having too much of it.

Full guide

Tamoxifen: A Tracking Guide for the SERM

A breast-cancer drug with boxed warnings, sometimes used off-label for gynecomastia or HPTA recovery. What to monitor and respect.

Other ancillaries (serms / ais)

Peptid AI is an educational and self-tracking tool — not a medical service, and not a vendor. Nothing here is medical advice, a prescription, or an endorsement. Doses reflect what is commonly reported in research literature; they are not recommendations. Many compounds listed are experimental, not approved for human use, and/or controlled substances that are illegal to possess without a prescription in many countries. Always consult a qualified physician before starting, changing, or stopping any protocol.