Enclomiphene Citrate Dosing for Older Adults (Ages 50 to 64)

Is there an approved enclomiphene dose for men in their 50s and early 60s?

No. FDA advisory-committee materials state that no FDA-approved drug contains enclomiphene as an active ingredient [3], and the EMA committee recommended refusing marketing authorisation for EnCyzix (enclomifene) in January 2018 [7]. With no approval, there is no label dose to adjust by age.

Men in this age range were eligible for some enclomiphene trials. The two phase 3 studies that compared enclomiphene with AndroGel 1.62% enrolled overweight men aged 18 to 60 with secondary hypogonadism [4], and a six-month open-label phase 3 safety study (NCT01534208) enrolled 499 men aged 18 to 65 who took 12.5 or 25 mg once daily [14].

What doses were actually studied?

A randomized, single-blind phase 2 study enrolled 48 men and tested 6.25, 12.5 and 25 mg once daily against AndroGel for six weeks; testosterone and LH rose with enclomiphene [1].

The phase 3 protocols started at 12.5 mg once daily, with up-titration to 25 mg daily at week 6 if morning testosterone stayed below 300 ng/dL [2].

For context on what SERMs do to testosterone numbers, a 2025 meta-analysis pooling randomized trials of clomiphene and enclomiphene together found total testosterone higher than placebo by a mean 273.76 ng/dL (95% CI 191.87 to 355.66), with high heterogeneity between studies, and no significant difference in testosterone versus testosterone gel [8].

What the trials measured in the men who took it

In the two phase 3 comparisons with AndroGel 1.62% (ZA-304 and ZA-305, 16 weeks), total testosterone rose in all treatment groups. LH and FSH rose with enclomiphene and fell with testosterone gel, and sperm concentration stayed in the normal range on enclomiphene while there was a marked reduction in spermatogenesis on the gel [4].

In one phase 3 trial registered as NCT01532414, 78.8% of men taking enclomiphene (95% CI 70.3 to 85.3, n=113) reached an average 24-hour testosterone in the normal range of 300 to 1040 ng/dL, while sperm concentration fell by 50% or more in 14.2% of men on enclomiphene versus 2.6% on placebo [2].

What these trials did not measure is symptoms. They tracked testosterone, LH, FSH and sperm counts, not whether men felt better, and both FDA and EMA flagged that gap [3]. EMA's refusal noted that the studies showed higher testosterone but did not look at whether symptoms such as bone strength, weight gain, impotence or libido improved [7].

Safety concerns reported with enclomiphene

FDA's 2022 review of enclomiphene listed cardiac and thromboembolic events, including pulmonary embolism and deep vein thrombosis in a safety study, along with raised estradiol, raised PSA, raised hematocrit, and no long-term safety data [3]. EMA noted a slightly higher rate of cardiac and thromboembolic events than with testosterone, and cataracts in nonclinical studies that were not conclusively linked in people [3]; its refusal also cited the risk of venous thromboembolism [7].

A 2026 British Society of Sexual Medicine position statement notes that enclomiphene is not approved by the FDA or EMA, that its manufacturer discontinued development in 2021, and that it should be used only by experienced clinicians in specialist or research settings [9].

What the label says, and which label that is

Enclomiphene has no label of its own. The approved product in this family is clomiphene citrate (Clomid), and it is indicated only for ovulatory dysfunction in women who want to become pregnant [10]. Its label states that there are no adequate or well-controlled studies demonstrating effectiveness in male infertility, and that testicular tumors and gynecomastia have been reported in men taking clomiphene, with cause and effect not established [10].

The Clomid label also warns about visual symptoms such as blurring, spots or flashes, which are usually reversible but have been reported to persist, and lists contraindications including liver disease, uncontrolled thyroid or adrenal dysfunction, pituitary tumor and pregnancy [10]. Those warnings and contraindications describe the two-isomer mixture; they have not been proven for enclomiphene alone [10].

Side effects reported with enclomiphene

The most frequent side effects across the phase 3 and EMA data were headache, hot flushes, nausea and muscle spasm, and reasons for stopping included blurred vision, muscle spasm, headache and aggression [5]. In the 12-week trial ZA-302, headache was reported by 7 of 112 men on 12.5 mg versus 1 of 47 on placebo, and nausea by 4 of 112 versus 3 of 47 [5].

Enclomiphene or testosterone gel?

The clearest split in the data is on the pituitary and on sperm. Enclomiphene raised LH and FSH while testosterone gel lowered them, and sperm concentration held in the normal range on enclomiphene while spermatogenesis dropped markedly on the gel [4]. A pooled analysis found no significant difference in total testosterone between SERMs and testosterone gel [8].

A retrospective study of 66 men at one academic center who took clomiphene and later enclomiphene found a median testosterone rise of 166 versus 98 ng/dL (P=0.20), an estradiol change of -5.92 versus +17.50 pg/mL (P=0.001), and fewer side effects on enclomiphene (odds ratio 0.18, 95% CI 0.07 to 0.44) [11]. That study was not randomized [11].

Regulatory and supply status

FDA's list of bulk drug substances, updated May 14, 2026, places enclomiphene citrate in Category 1, bulk substances under evaluation. FDA says it does not intend to take action against a compounder using a Category 1 substance if the conditions in its guidance are met, which is an enforcement-discretion policy and not a finding that the product is safe or effective [6]. At the June 8, 2022 meeting of FDA's Pharmacy Compounding Advisory Committee, members voted 4 yes and 8 no on adding enclomiphene citrate to the list of allowed bulk substances [12]. Enclomiphene is not on FDA's list of bulk substances that raise significant safety risks, and compounded enclomiphene products are not FDA-approved or reviewed by FDA for safety, effectiveness or quality [13].

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