How to Safely Stop Enclomiphene Citrate: A Step-by-Step Discontinuation Guide

At a glance

• Approval status / Enclomiphene is not FDA-approved, and no FDA-approved enclomiphene product has a label with stopping instructions [1]
• Studied doses / 12.5 mg daily, with uptitration to 25 mg in phase 3 protocols [3]
• Half-life / About 10 hours [1]
• Taper schedule / None described in the trial reports
• Post-stop testosterone / Returned to pretreatment values at one month in a 12-man study [2]
• Common side effects / Headache, hot flushes, nausea, muscle spasm [4]
• Reasons for stopping in trials / Blurred vision, muscle spasm, headache, aggression [4]
• Long-term safety / No long-term data; FDA listed cardiac and thromboembolic events [1]

Is there a step-by-step discontinuation protocol?

Enclomiphene has no FDA-approved product or FDA-approved product label with stopping instructions [1]. Compounded enclomiphene products are not FDA-approved and have not been reviewed by FDA for safety, effectiveness or quality [5]. The British Society of Sexual Medicine position statement notes that long-term efficacy and safety data are lacking [6].

Phase 3 protocols used 12.5 mg once daily, with uptitration to 25 mg at week 6 if morning testosterone stayed below 300 ng/dL [3].

What happens to testosterone after stopping?

A study of 12 men previously treated with topical testosterone compared enclomiphene with testosterone gel [2]. After treatment stopped, total testosterone decreased one month posttreatment to pretreatment values [2].

Enclomiphene is absorbed rapidly, with peak levels 2 to 3 hours after a dose and a half-life of about 10 hours [1].

What did trials report about stopping for side effects?

In phase 3 and EMA data, the most frequent side effects were headache, hot flushes, nausea and muscle spasm. Reasons for stopping included blurred vision, muscle spasm, headache and aggression [4]. In ZA-302, headache occurred in 7 of 112 men on 12.5 mg and 1 of 47 on placebo; nausea occurred in 4 of 112 and 3 of 47 [4].

FDA's 2022 review listed cardiac and thromboembolic events, raised estradiol, raised PSA and raised hematocrit, and noted no long-term safety data [1].

Is enclomiphene the same as clomiphene?

No. Clomiphene citrate is a mixture of enclomiphene (trans) and zuclomiphene (cis); the USP monograph gives enclomiphene content of clomiphene as 50 to 70 percent [1]. Clomiphene is FDA-approved for ovulatory dysfunction in women desiring pregnancy. Its label has no male indication and says there are no adequate or well-controlled studies that demonstrate effectiveness in male infertility [7].

The Clomid label states that zuclomiphene has a longer half-life than enclomiphene and that detectable zuclomiphene levels persisted longer than a month [7]. That label covers clomiphene citrate, not enclomiphene.

What is not known

The 12-man study did not compare stopping methods [2]. It does not describe an alternate-day plan, a post-stop lab timetable, a restart threshold or a withdrawal syndrome.

Frequently asked questions

›Can enclomiphene be stopped abruptly?

No trial compared abrupt stopping with a taper. The only post-stopping data come from a 12-man study that did not compare stopping methods [2].

›How long does testosterone take to return after stopping?

One 12-man study found testosterone fell back to pretreatment values one month after stopping [2].

›What side effects led men to stop in trials?

Reasons for stopping included blurred vision, muscle spasm, headache and aggression [4]. The most frequent side effects were headache, hot flushes, nausea and muscle spasm [4].

›Does enclomiphene cause withdrawal?

No withdrawal syndrome is described in the trial reports [2][4].

References

1. U.S. Food and Drug Administration. U.S. Food and Drug Administration
2. Kaminetsky J, Werner M, Fontenot G, Wiehle RD. Oral enclomiphene citrate stimulates the endogenous production of testosterone and sperm counts in men with low testosterone: comparison with testosterone gel. J Sex Med. 2013;10(6):1628-35. Oral enclomiphene citrate stimulates the endogenous production of testosterone and sperm counts in men with low testosterone: comparison with testosterone gel
3. Official web page. Official web page
4. Official web page. Official web page
5. Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks | FDA. Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks | FDA
6. Foster J, Choo L, Patel A, Kirby M, Hackett G. British Society of Sexual Medicine: Position Statement for the Potential Use of Enclomiphene in the Treatment of Male Hypogonadism. World J Mens Health. 2026;44(3):480-483. British Society of Sexual Medicine: Position Statement for the Potential Use of Enclomiphene in the Treatment of Male Hypogonadism
7. U.S. National Library of Medicine, DailyMed. Clomid (clomiphene citrate) tablets, Cosette prescribing information. Clomid (clomiphene citrate) tablets, Cosette label
8. Official web page. Official web page