Nolvadex PCT: How to Run Post Cycle Therapy with Tamoxifen

Tamoxifen, best known by its original brand name Nolvadex, is the most common single medicine in post cycle therapy. This guide explains how it works, the usual Nolvadex PCT doses, when to start and what to watch for. For the bigger picture, start with our step-by-step guide to PCT.

What is Nolvadex (tamoxifen)?

Tamoxifen is a selective estrogen receptor modulator (SERM). It was developed for breast cancer, where it blocks estrogen in breast tissue, and it has been in use since the 1970s. In men it is used off-label for two things that matter after a cycle:

• Restarting natural testosterone. It blocks estrogen’s feedback at the hypothalamus and pituitary, so the brain raises LH and FSH again.
• Treating gynecomastia. It blocks estrogen at the breast tissue, which can reverse early, tender gyno.

Common generic brands include Tamodex, Cytotam, Tamilong and Tamoxican. They all contain the same active ingredient, tamoxifen citrate, and usually come as 10 mg or 20 mg tablets.

How Nolvadex works in PCT

After a cycle, your HPTA (the brain-to-testes hormone loop) is switched off. Tamoxifen sits on the estrogen receptors in the hypothalamus and pituitary without activating them. The brain reads this as “estrogen is low” and responds by raising GnRH, then LH and FSH. LH tells the testes to produce testosterone again, and FSH supports sperm production.

Tamoxifen is converted by the liver enzyme CYP2D6 into its more potent metabolites, mainly endoxifen. That matters for interactions, covered below.

Nolvadex PCT dosage

These are the protocols most commonly described in harm-reduction literature. They are not a prescription, so discuss them with a doctor. Doses are per day.

Standard: 40/40/20/20

• Week 140 mgtamoxifen
• Week 240 mgtamoxifen
• Week 320 mgtamoxifen
• Week 420 mgtamoxifen

Gentler: 20 mg a day for 4 to 6 weeks

Studies of tamoxifen in men with low testosterone mostly used 20 mg a day and showed clear rises in LH and testosterone. For shorter or milder cycles, many people use 20 mg throughout, which halves the dose with little loss of effect.

Combined with clomiphene

For long or heavy cycles, Nolvadex is sometimes paired with Clomid. A common plan is tamoxifen 40/40/20/20 mg alongside clomiphene 50/50/25/25 mg. There is little evidence that the pair recovers people faster than tamoxifen alone, and it adds side effects.

When to start Nolvadex PCT

Start once the steroids have cleared enough that they are no longer suppressing you:

• Short esters (testosterone propionate, trenbolone acetate): 2 to 3 days after the last injection
• Long esters (testosterone enanthate or cypionate): 10 to 14 days after the last injection
• Nandrolone decanoate or boldenone: about 3 weeks
• Oral-only cycles: 1 to 3 days

See When to start PCT for stacked cycles and HCG timing.

Side effects of Nolvadex

At PCT doses and for four weeks, most people notice little. Possible side effects:

• Hot flushes, mild nausea, headaches
• Mood changes or tiredness, usually milder than with clomiphene
• Slightly lower IGF-1 while you take it
• Blood clots (DVT, pulmonary embolism): rare, but the most serious risk. It is higher if you smoke, are immobile for long periods (long flights), have a high haematocrit after a cycle, or have a personal or family history of clots.
• Vision changes: rare, and mostly linked to long-term, high-dose use

Interactions to know about

Because tamoxifen needs CYP2D6 to become fully active, medicines that block that enzyme can make it work less well. The best-known are the antidepressants fluoxetine and paroxetine, and also bupropion. If you take any regular medicine, ask a pharmacist to check it against tamoxifen. Tamoxifen also increases the effect of warfarin.

Nolvadex for gynecomastia during a cycle

If you develop tender, puffy nipples or a small lump under the nipple during a cycle, that is early gynecomastia. Tamoxifen 10 to 20 mg a day can often stop and reverse it if started early. Hard, long-standing gyno usually does not respond to medicine. Check estradiol, and prolactin if you use nandrolone or trenbolone, to find the cause.

Buy tamoxifen (Nolvadex)

See all tamoxifen products, or the full Post Cycle Therapy range.