Post-cycle therapy (PCT) is a medical treatment to help your body restart its own testosterone production after it has been switched off by testosterone therapy or anabolic steroids. Recovery can happen on its own, but it is often slow, and some men are left with weeks or months of low testosterone symptoms. At Transcend Clinic in Bangkok, our doctor assesses your situation, tests your hormones, and builds a recovery plan around you.
Why testosterone shuts down
Your testicles make testosterone when the brain tells them to. The hypothalamus and pituitary gland release two signaling hormones, LH and FSH. LH drives testosterone production, and FSH supports sperm production.
When testosterone or anabolic steroids come from outside the body, the brain senses high levels and stops sending LH and FSH. The testicles then produce little testosterone or sperm and often shrink. When the outside source stops, a gap appears: the medicine has left the body, but the brain and testicles haven’t restarted yet. That gap is when men feel the effects of low testosterone.
Who might need post-cycle therapy?
- Men stopping testosterone therapy (TRT), for example, to try for a baby or because they no longer want ongoing treatment
- Men who have used anabolic steroids and want to come off safely
- Men whose testosterone hasn’t recovered months after stopping
Symptoms of low testosterone after stopping
- Low sex drive and erectile problems
- Fatigue and low mood
- Loss of muscle and strength, and fat gain
- Poor sleep and concentration
- Smaller testicles and reduced fertility
How long does recovery take?
It varies a lot. Recovery depends on how long you used testosterone or steroids, the doses, the type of compounds, your age, and your starting hormone levels. Some men recover within a few months, while after long or high-dose use it can take a year or more, and a small number never fully recover. Studies of former steroid users show that many still have low testosterone long after stopping (Rahnema et al., Fertility and Sterility, 2014).
How post-cycle therapy works
PCT uses medicines that restart the brain-to-testicles signal. Depending on your situation, options include:
- SERMs (clomiphene, enclomiphene, or tamoxifen): block estrogen’s feedback in the brain, so the pituitary releases more LH and FSH. Read more about clomiphene →
- hCG: acts like LH directly on the testicles, helping them restart testosterone and sperm production. It is sometimes used first, before a SERM.
- Aromatase inhibitors: only in selected cases, guided by blood tests, because lowering estrogen too much causes its own problems.
A course usually lasts 4 to 6 weeks or more, depending on your response and overall health. There are no large controlled trials of PCT protocols. They are based on how these medicines work, smaller studies and clinical experience, which is why monitoring matters more than following a fixed online protocol.
Tests before and during PCT
Before starting, we check total and free testosterone, LH, FSH, and estradiol, and, where relevant, we do a semen analysis. We repeat key tests during and after treatment to confirm your body has resumed production, rather than relying on how you feel. Many of these tests are part of our hormone check-ups.
What if testosterone doesn’t recover?
If your testosterone stays low despite PCT and enough time, you may have ongoing hypogonadism. In that case, we’ll discuss your options, including longer-term testosterone therapy where appropriate.
Frequently asked questions
Can supplements do the job of PCT?
There is no good evidence that over-the-counter “PCT supplements” restart testosterone production.
How long does PCT last?
Usually 4 to 6 weeks or more, followed by repeat blood tests. The exact plan depends on your history, how you respond, and your overall health.
Can PCT restore fertility?
Often, yes, but sperm production can take longer to recover than testosterone. If fertility is your goal, we may recommend a semen analysis.
Why not just stop and wait?
Some men do recover on their own. PCT aims to shorten the low-testosterone gap and confirm that recovery actually happens.
Is cycling testosterone on and off a good idea?
Repeated stopping and starting means repeated crashes in your own production. Why short testosterone cycles backfire →
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