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
| Class | SERMs |
|---|---|
| Half-life | 5-7 days |
| Detection window | 60 days |
| Hepatotoxicity | None |
| Suppression | 0/10 |
| Administration | oral |
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
- Incompatible combinations per internal rule set: tren-ace, tren-enan, Deca Durabolin (Nandrolone Decanoate), NPP (Nandrolone Phenylpropionate), Clomiphene (Clomid), Enclomiphene.
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 — pharmacokineticSome 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 — hormonalTamoxifen 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 — hormonalTamoxifen 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
- Pharmaceutical reference. 2004. Clinical pharmacology reference — Half-life approximately 5-7 days for tamoxifen
- 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
- 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
- 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
- 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)
- 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.