Tamoxifen (Nolvadex) — Dosing, Cycles, Half-Life & Side Effects

Tamoxifen (Nolvadex) is a selective estrogen receptor modulator (SERM) with a half-life of 5-7 days. Selective estrogen receptor modulator for PCT and estrogen control. This page is educational harm-reduction reference compiled from peer-reviewed literature — not medical advice, not an endorsement, not a recommendation to use. Consult a licensed clinician before any decision.

Quick Facts

ClassSERMs
Half-life5-7 days
Detection window60 days
HepatotoxicityNone
Suppression0/10
Administrationoral

Typical Dosing Ranges

Common dose range: 20-40mg/day

Cycle length: 4-6 weeks

Time to steady state: ~30 days

Dose ranges are compiled from published pharmacokinetic studies and community-reported usage. Where a value is community-reported rather than clinically studied, this page and its structured data flag it. Lower end of any range is always the safer starting point.

Stacking Considerations

PCT Requirements

  • Depot clearance estimate: ~30 days post-last-dose before SERM start (5 × apparent depot half-life of 144h).
  • Never stack two SERMs. Extend a single SERM (tamoxifen OR enclomiphene/clomiphene) rather than combining.
  • Use the cycle planner to generate a full protocol based on your complete stack, not this compound alone.

Side Effect Profile

  • Mood changes
  • Vision changes
  • Hot flashes

Known Interactions

  • Tamoxifen (Nolvadex) + Anastrozole (Arimidex)

    minor — pharmacokinetic

    Some research suggests anastrozole may reduce tamoxifen effectiveness.

    Recommendation: Consider aromasin with tamoxifen for PCT if AI needed.

    Monitor: Estradiol, Recovery markers

  • Trenbolone Acetate + Tamoxifen (Nolvadex)

    moderate — hormonal

    Tamoxifen may up-regulate progestin receptors when used with 19-nor compounds.

    Recommendation: Consider enclomiphene as alternative SERM for PCT after trenbolone cycles.

    Monitor: Progesterone, Prolactin, LH, FSH

  • Deca Durabolin (Nandrolone Decanoate) + Tamoxifen (Nolvadex)

    moderate — hormonal

    Tamoxifen may up-regulate progestin receptors when used with 19-nor compounds.

    Recommendation: Consider enclomiphene as alternative SERM for PCT after nandrolone cycles.

    Monitor: Progesterone, Prolactin, LH, FSH

Related compounds

Monitoring (Bloodwork & Vitals)

  • Comprehensive metabolic panel (baseline, mid-cycle, post-cycle)
  • Lipid panel (total cholesterol, HDL, LDL, triglycerides)
  • CBC (hemoglobin, hematocrit — watch for erythrocytosis)
  • Sex-hormone panel (Total T, Free T, Estradiol sensitive, SHBG, LH, FSH)
  • Blood pressure (weekly self-check; flag systolic >140 or diastolic >90)

Baseline bloodwork is recommended before any cycle. Discontinue if liver enzymes exceed 3× upper limit of normal or if hematocrit exceeds 54%.

Frequently Asked Questions

What is the half-life of Tamoxifen (Nolvadex)?

Tamoxifen (Nolvadex) has a half-life of approximately 5-7 days. Clearance estimate: 144h × 5 = 720h = 30 days. This figure is used to determine injection frequency (for esters) and post-cycle clearance timing.

What is the typical dose range for Tamoxifen (Nolvadex)?

Commonly reported ranges for Tamoxifen (Nolvadex): 20-40mg/day. Cycle length: 4-6 weeks. These are compiled from published studies and community-reported usage — individual response varies and lower end is always preferred.

Does Tamoxifen (Nolvadex) suppress natural testosterone?

Tamoxifen (Nolvadex) causes minimal suppression of the HPTA axis (score 0/10). PCT may still be advisable depending on stack and duration.

What is Tamoxifen (Nolvadex) typically used for?

Tamoxifen (Nolvadex) is commonly used for: PCT, Estrogen control, All experience levels. Intended-use context does not imply safety — every use case carries the same underlying pharmacological risks.

Is Tamoxifen (Nolvadex) legal?

Tamoxifen (Nolvadex) is a controlled substance in many jurisdictions (typically Schedule III in the US when it is an anabolic androgenic steroid). StackItSmart does not provide sourcing information. Possession, import, and use without a prescription carry legal consequences that vary by country and state.

Citations

  1. Pharmaceutical reference. 2004. Clinical pharmacology reference — Half-life approximately 5-7 days for tamoxifen
  2. McBride JA, Coward RM. 2016. Asian J Androl — Standard PCT dosing reviewed: mild 20mg/day 4 weeks; moderate 40/40/20/20; heavy 40/40/20/20 for 6 weeks
  3. Bhasin S et al.. 2018. J Clin Endocrinol Metab — Tamoxifen terminal half-life 5-7 days per Endocrine Society 2018 testosterone therapy guideline; accumulation to steady-state ~4-6 weeks
  4. Handelsman DJ / Shankara-Narayana N et al.. 2022. Eur J Endocrinol — HPTA recovery median 52 weeks post-AAS; informs SERM PCT duration rationale — tamoxifen monotherapy duration calibrated against 19-nor extended recovery trajectories
  5. de Oliveira Vilar Neto JF et al.. 2021. Andrologia — Systematic review: only 4/38 known-outcome AAS-induced hypogonadism cases fully recovered; informs PCT selection and duration — tamoxifen as single-SERM PCT candidate, no dual-SERM recommendation (PROJECT.md constraint)
  6. Jordan VC. Tamoxifen: a most unlikely pioneering medicine. Nat Rev Drug Discov. 2003;2(3):205-13. PMID: 12612646

Disclaimer

StackItSmart is an independent harm-reduction reference. The content above is compiled from peer-reviewed literature and is not medical advice, not an endorsement, and not a recommendation to use Tamoxifen (Nolvadex). Performance-enhancing compounds carry legal, endocrine, cardiovascular, and hepatic risks. Consult a licensed clinician before any decision. StackItSmart does not provide sourcing, procurement, or dosing prescriptions.

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