How Long Does Enclomiphene Stay in Your System?

Testosterone plays a major role in many aspects of men’s health, including sex drive, erectile function, muscle mass, and mood. So if your levels dip too low consistently, it’s no surprise you might feel off.

When it comes to treatments for low T, enclomiphene citrate is emerging as a promising option. The drug is not yet FDA-approved, but a body of research has found that it may boost testosterone production without compromising sperm count in men with low T due to certain medical conditions. 

With a relatively short half-life of about 10.5 hours, enclomiphene clears from the blood fairly quickly, but its hormonal effects last longer because it stimulates your body’s own testosterone production between doses. 

Next, we’ll cover how quickly enclomiphene works, how long it stays in your system, and what to expect if you decide to stop taking it.

Enclomiphene is a selective estrogen receptor modulator (SERM) and one of the isomers in the fertility drug clomiphene citrate (Clomid^®), an FDA-approved fertility drug for women sometimes used off-label in men. 

Enclomiphene helps your body make more testosterone by interfering with estrogen’s effect on the hypothalamic-pituitary-gonadal (HPG) axis.

Here’s a quick rundown of how enclomiphene works:

• It blocks estrogen. As an estrogen antagonist, enclomiphene binds to estrogen receptors in the brain, preventing estrogen from binding and exerting its typical effects.

• It stimulates gonadotropin secretion. By blocking estrogen, enclomiphene increases luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels.

• LH and FSH signal the testes. Increasing LH and FSH levels prompts the testes to produce more testosterone and sperm.

Though enclomiphene and clomiphene work similarly, the latter has an additional isomer called zuclomiphene, an estrogen agonist that mimics the effects of estrogen in the body. This can cause high levels of estradiol, a form of estrogen, which can lead to side effects such as mood swings and gynecomastia (breast growth).

In trials, the most common adverse effects from enclomiphene included headaches, nausea, dizziness, hot flashes, blurred vision, and muscle spasms. Most studies are small, and long-term safety data are still lacking. Larger, independent trials will be needed before we fully understand its risks and benefits.

Enclomiphene is rapidly absorbed after it’s taken by mouth, reaching peak levels within two to three hours.

But how quickly does enclomiphene change testosterone levels on a blood test?

In a 2013 study, daily dosing led to early improvements in total testosterone that were clearly evident by week six, along with increased LH and FSH levels. While testosterone rises within two to six weeks, subjective symptom improvements of low T can take longer.

In clinical studies of men with secondary hypogonadism, enclomiphene dosing, moving from 12.5 mg to 25 mg/day, produced the most significant LH increase, but total testosterone rose only about 27 percent more, pointing to a dose-limiting ceiling at the Leydig cell level. In short, enclomiphene hasn’t been found to push testosterone levels into supraphysiologic ranges, which is a good thing.

Supraphysiologic testosterone ranges, which are more common with androgen abuse, are considered much higher than what is usually found or produced in a healthy body and can lead to potential side effects like aggression, high blood pressure, and an increase in red blood cell count.

In one placebo-controlled study of 52 men that compared enclomiphene to topical testosterone, enclomiphene increased total and free testosterone within 14 days, restoring normal ranges of testosterone (and not supraphysiologic levels). Topical testosterone, on the other hand, led to supraphysiologic levels of total testosterone.

As far as noticeable changes to how you look and feel, there’s a lot we don’t know about enclomiphene, and results may vary person to person. But it’s safe to say you likely won’t notice a difference overnight, and any potential energy, mood, or libido improvements may take weeks.

As we already mentioned, enclomiphene has an average half-life of around 10 hours, which means half the drug is cleared from the body in that timeframe.

However, its effects on testosterone production may last longer. Clinical studies show that testosterone and LH remain elevated for up to a week after stopping treatment, reflecting its stimulation of the body’s own hormone production.

This “carryover” effect means missing a dose or two is unlikely to cause an immediate drop. By contrast, men who discontinue testosterone replacement therapy experience a rapid decline in hormone levels, often returning to hypogonadal ranges within days.

Studies suggest testosterone rises within two to six weeks of daily enclomiphene, with levels staying in the normal physiological range — not the supraphysiologic levels sometimes seen with TRT or androgen abuse. Still, most trials are small and short-term, so more research is needed to understand long-term effects on hormones such as DHT and estradiol, as well as safety outcomes.

Enclomiphene is meant to be taken long term, as discontinuing the medication eventually returns blood testosterone to baseline levels.

Studies show that stopping enclomiphene may return testosterone to pre-treatment, baseline levels within a month. This may also mean a gradual return of low testosterone symptoms like low libido, fatigue, erectile dysfunction (ED), and brain fog.

The medication's legacy effect means that the return to baseline T levels is gradual. 

This is a stark contrast to what is typically seen with testosterone replacement therapy (TRT). Studies on TRT withdrawal show that stopping exogenous testosterone results in a swift reduction of testosterone to hypogonadal levels. What’s more, positive outcomes of TRT, such as changes in sexual function and body composition, worsened after therapy discontinuation.

Learn more about what to expect when stopping enclomiphene.

Whether you’re taking enclomiphene or not, there are plenty of steps you can take to support healthy testosterone production and overall well-being:

• Follow a healthy diet. Following a mostly organic Mediterranean diet low in carbs and high in legumes, whole grains, and green leafy vegetables is associated with improved testosterone levels and healthy sperm.

• Incorporate resistance training into your routine. Studies show that bouts of resistance exercise may increase testosterone, potentially increasing muscle growth and strength.

• Consider closing nutritional gaps with supplements. Eating a wide variety of organic foods with plenty of fruits and vegetables is typically enough to get the nutrients your body needs to support your natural production of testosterone. But if your diet is limited or you lack certain vitamins and minerals despite your best efforts, supplements may help you close nutritional gaps.

• Don’t drink in excess. If you drink, try not to overdo it. Excessive drinking reduces testosterone levels by increasing cortisol, inflammation, and oxidative stress.

• Lower your stress levels. While acute stress caused by things like sports competitions or tests may temporarily increase testosterone levels, prolonged or chronic stress can inhibit the HPG axis and its testosterone release.

Explore more ways to increase testosterone levels naturally.

Enclomiphene is a rapidly absorbed medication with a relatively short half-life. Though it leaves your system quickly, its effects may last longer. Here’s what we know:

• Enclomiphene reaches peak levels within a couple of hours. However, it may take weeks to notice improvements in low T symptoms.

• Enclomiphene clears from the body in about two days, thanks to its short half-life. However, its effects on hormone signaling can last up to a week, giving it a “legacy” benefit even after stopping.

• Enclomiphene is an effective treatment option, but it’s not an instant fix. Because improvements take time, healthy lifestyle habits like nutrition, exercise, and stress management can make a big difference in overall results.

• Enclomiphene isn’t FDA-approved yet.  Its previous approval attempt was rejected and it remains investigational in the U.S., though some compounding pharmacies may provide it with a valid prescription.

Learn more about the side effects and risks of enclomiphene and find out how it differs from steroids.

If you’re struggling with symptoms of low testosterone, like erectile dysfunction or low libido, get medical advice from a healthcare provider today to explore your options.