What Is the Half-Life of Enclomiphene? | Elite Bio Supply

What Is the Half-Life of Enclomiphene?

Enclomiphene has a half-life of approximately 10 hours. This is significantly shorter than zuclomiphene (the cis-isomer found in Clomid), which has a half-life of 2 to 4 weeks. This pharmacokinetic difference is one of enclomiphene’s key advantages.

What the 10-hour half-life means: After a single dose, half the enclomiphene is eliminated from your body within 10 hours. After 50 hours (5 half-lives), it is essentially cleared. This means enclomiphene reaches steady state within 2 to 3 days of consistent daily dosing, and clears the system within 2 to 3 days of stopping.

Comparison with Clomid: Clomid contains both enclomiphene (10-hour half-life) and zuclomiphene (2-4 week half-life). When you take Clomid daily, the enclomiphene portion clears quickly while zuclomiphene accumulates over weeks to months. This accumulation causes estrogenic side effects (elevated estradiol, mood changes, gynecomastia risk) that worsen with long-term use. Pure enclomiphene avoids this entirely.

Dosing implications: The 10-hour half-life supports once-daily dosing. Taking enclomiphene in the morning provides therapeutic levels through most of the day. Some researchers prefer splitting into two daily doses (morning and midday) for more stable levels, though this is not necessary based on clinical trial protocols that used once-daily dosing.

Recovery after stopping: Because enclomiphene clears in 2 to 3 days, HPG axis recovery begins almost immediately after discontinuation. This contrasts with Clomid, where zuclomiphene can remain active for weeks after the last dose.