When to start post-cycle therapy (PCT) depends on which compounds you used. The general rule: wait until the steroid has largely cleared your system, then begin. For longer-acting esters like testosterone enanthate or cypionate, that means waiting about two weeks after your last injection. For shorter-acting compounds like testosterone propionate, you can start within three to four days.
Why Timing Matters
During a steroid cycle, the external testosterone signals your brain to stop producing its own. Specifically, high testosterone levels suppress two hormones from the pituitary gland (LH and FSH) that normally tell your testes to make testosterone. When you stop injecting, those signals don’t instantly return. Your body sits in a hormonal gap: the exogenous testosterone is dropping, but your natural production hasn’t restarted yet. PCT drugs work by blocking estrogen’s suppressive effect on the pituitary, which nudges LH and FSH back into action. But they can only do this effectively once the exogenous steroid levels have fallen low enough to stop overriding the signal.
Starting PCT too early wastes your medication while the steroid is still active. Starting too late extends the window where your testosterone is essentially at zero, which worsens side effects like fatigue, low libido, muscle loss, and mood changes.
Wait Times by Compound
The wait time before starting PCT is based on each steroid’s half-life, which is how long it takes for half the drug to clear your body. You generally want to wait roughly two half-lives so that blood levels have dropped to about 25% of peak.
- Testosterone propionate (half-life: ~4.5 days): Start PCT 3 to 4 days after your last injection.
- Testosterone enanthate (half-life: 7 to 9 days): Start PCT about 14 days after your last injection.
- Testosterone cypionate (half-life: ~8 days): Start PCT about 14 days after your last injection.
- Nandrolone decanoate and other very long-acting esters: These can require three weeks or more before PCT begins, since the ester takes much longer to clear.
If you stacked multiple compounds, base your timing on whichever one has the longest half-life.
Standard PCT Protocols
The two most common PCT medications are clomiphene (Clomid) and tamoxifen (Nolvadex). Both are selective estrogen receptor modulators (SERMs) that block estrogen at the pituitary, encouraging it to release more LH and FSH. A typical protocol runs four weeks:
- Clomiphene: 50 mg per day for four weeks.
- Tamoxifen: 20 mg per day for four weeks.
Some users run both simultaneously, though there’s limited clinical data showing a combination is more effective than either one alone. Others use a tapered approach, starting at a higher dose for the first one to two weeks and reducing it for the remaining weeks. The four-week, flat-dose protocol is the most widely referenced in clinical literature on performance-enhancing drug recovery.
What Recovery Actually Looks Like
Your pituitary hormones (LH and FSH) typically recover to baseline levels within 2 to 16 weeks after stopping steroids, with most people seeing full gonadotropin recovery in three to six months. That’s a wide range, and individual factors play a significant role. Longer cycles, higher doses, and the use of multiple compounds all tend to extend recovery time.
Testosterone itself takes longer. Research from a scoping review in Endocrine Connections found that testosterone recovery is expected but “likely to be incomplete” even months or years after stopping in some cases. This is more of a concern for people who ran very long cycles or used steroids for years. For a standard cycle of 8 to 16 weeks, most users see meaningful testosterone recovery during and shortly after their PCT window, though full normalization can take several months beyond that.
During the PCT period, expect some degree of low-testosterone symptoms. Energy and libido will likely dip. Strength may decrease. Mood can be unstable. These effects are temporary for most people but can be more pronounced if PCT is poorly timed or skipped entirely.
Side Effects of PCT Medications
PCT drugs are not side-effect-free. Clomiphene is known to cause visual disturbances in some users, including blurry vision and light sensitivity. These effects are typically reversible when the drug is stopped, but they warrant immediate attention if they occur.
Tamoxifen carries a documented risk of blood clots, particularly pulmonary embolism (clots in the lungs). Data from a large meta-analysis published by the National Cancer Institute found that this risk was concentrated in the first five years of use in cancer patients taking tamoxifen long-term. At the short durations used in PCT (four weeks), the absolute risk is much lower, but it exists. Tamoxifen also slightly raises the risk of uterine cancer with long-term use, though this was primarily seen in women over 54 taking it for years.
For the typical four-week PCT window, serious side effects are uncommon but not impossible. Staying aware of symptoms like sudden chest pain, shortness of breath, or vision changes is worth doing during any PCT protocol.
Signs Your PCT Isn’t Working
If you’re still experiencing severe fatigue, zero libido, or depressive symptoms several weeks after finishing PCT, your natural testosterone production may not have recovered adequately. Bloodwork is the only reliable way to confirm this. A basic panel measuring total testosterone, LH, and FSH will show whether your pituitary is sending the right signals and whether your testes are responding. If LH and FSH are elevated but testosterone remains low, that points to a testicular production problem rather than a pituitary one, and the approach changes.
Checking bloodwork before your cycle, at the end of PCT, and again four to six weeks later gives you a clear picture of your recovery trajectory. Without those numbers, you’re guessing.