How to Do PCT: A Step-by-Step Post Cycle Therapy Guide

If you have finished, or are planning, a cycle of testosterone or another anabolic steroid, the question that matters most comes after the last injection: how do you get your natural testosterone back? That is the job of post cycle therapy (PCT). This guide covers why PCT is needed, the medicines used, when to start, what a typical protocol looks like and how to tell whether it worked.

What is PCT and why is it needed?

Your testosterone is controlled by a feedback loop called the HPTA (hypothalamic–pituitary–testicular axis):

1. The hypothalamus releases GnRH.
2. GnRH tells the pituitary gland to release LH (luteinising hormone) and FSH (follicle-stimulating hormone).
3. LH tells the testes to make testosterone, and FSH supports sperm production.
4. When testosterone and estrogen are high, the brain sees it and turns GnRH, LH and FSH down.

During a cycle your body sees far more androgen than it needs, so it shuts the loop down: LH and FSH fall close to zero, the testes stop producing testosterone and often shrink. When the cycle ends, the outside supply disappears but the loop is still switched off. That gap is anabolic steroid-induced hypogonadism (ASIH), and its symptoms are familiar: low libido, erectile problems, fatigue, low mood, and loss of the muscle you built.

Left alone, the HPTA usually restarts, but it can take months, and for some people longer. PCT aims to shorten that window by stimulating the brain to send LH and FSH again.

The medicines used in PCT

SERMs: the core of almost every PCT

Selective estrogen receptor modulators block estrogen’s signal at the hypothalamus and pituitary. The brain reads this as “estrogen is low”, so it raises GnRH, LH and FSH, and the testes respond by making testosterone. The two SERMs used for PCT are:

• Tamoxifen (Nolvadex): usually 20 to 40 mg a day. Well tolerated, and also used to treat gynecomastia. See our Nolvadex PCT guide.
• Clomiphene (Clomid): usually 25 to 50 mg a day. Has the most clinical data in men with secondary hypogonadism, but more mood and vision side effects. See our Clomid PCT guide.

Enclomiphene, the “active” half of clomiphene, is a newer option with fewer estrogenic side effects. It has less real-world PCT data so far.

HCG: restarting the testes

Human chorionic gonadotropin (HCG) mimics LH and acts directly on the testes. It does not restart the brain’s signal, so it is not a PCT on its own. It is used to keep the testes responsive during a long cycle, or as a short “bridge” before SERMs start, so the testes are ready to answer when LH returns.

Aromatase inhibitors: usually not needed

Anastrozole, letrozole and exemestane lower estrogen. They are sometimes used during a cycle, but in PCT they are optional at most. Estradiol that is too low causes joint pain, low libido and low mood, and slows recovery. Most protocols leave them out unless bloodwork shows high estradiol.

When to start PCT

Starting while the steroids are still active wastes the PCT, because the brain is still being suppressed. Starting too late leaves you in the low-testosterone gap for longer. The rule: begin once the longest-acting compound has largely cleared.

More detail, including stacked cycles, is in When to start PCT.

A typical PCT protocol

The protocols below are the ones most often described in harm-reduction literature. They are a starting point for a conversation with a doctor, not a prescription. Doses are per day.

Tamoxifen-only PCT (the most common)

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

Clomiphene-only PCT

• Week 150 mgclomiphene
• Week 250 mgclomiphene
• Week 325 mgclomiphene
• Week 425 mgclomiphene

Combined PCT (longer or heavier cycles)

Some people run both together for 4 weeks: tamoxifen 40/40/20/20 mg plus clomiphene 50/50/25/25 mg. There is little evidence that the combination recovers people faster than a single SERM, and it doubles the side-effect risk, so many protocols keep it for long, high-dose or nandrolone-based cycles.

Side effects and safety

• Tamoxifen: hot flushes, nausea, mood changes and, rarely, blood clots (DVT or pulmonary embolism). The clot risk is the reason to avoid it if you have a personal or family history of clots.
• Clomiphene: mood swings, irritability, headaches and visual disturbances (blurring, flashes, floaters). Stop clomiphene straight away if your vision changes.
• HCG: can raise estradiol and cause water retention or nipple sensitivity, especially at higher doses.

Bloodwork: how to know PCT worked

How you feel is a poor guide, because SERMs raise testosterone while you take them. The real test is 4 to 6 weeks after the last PCT tablet, once the SERM has cleared. A useful panel:

• Total and free testosterone, and SHBG
• LH and FSH: these show whether the brain has restarted, not just the testes
• Estradiol (sensitive assay) and prolactin, especially after nandrolone or trenbolone
• Haematocrit, lipids and liver enzymes, which steroids commonly disturb

Ideally compare the results with a baseline taken before the cycle. Normal LH, FSH and testosterone without any medicine means you have recovered. Low testosterone with low LH means the brain has not restarted. That is the time to see an endocrinologist rather than run another PCT.

What helps recovery besides medicine

• Sleep 7 to 9 hours. Most daily testosterone is released during sleep.
• Eat at maintenance or slightly above. A hard diet during PCT suppresses testosterone further.
• Keep training, at a lower volume, to protect muscle while hormones are low.
• Avoid alcohol and other drugs, which suppress the HPTA and add to the liver’s load.
• Give it time. Full recovery commonly takes 3 to 6 months after long cycles, and longer with age and repeated cycles.

Shop PCT medicines

Tamoxifen and clomiphene from licensed manufacturers, all shipped with at least 12 months of shelf life:

Browse the full Post Cycle Therapy category for HCG, enclomiphene and more.