The qADAM scores for hypogonadal symptoms showed no significant difference in men treated with CC, testosterone injections, and testosterone gels and those not receiving TST (35, 39, 36, and 34, respectively). Men receiving testosterone injections reported greater libido (range, 1-5) than men using CC, those using testosterone gels, and those not on TST (4 vs 3, 3, and 3; P = .047, .04, and < .01, respectively), but it is uncertain if this is clinically meaningful.
Enclomiphene citrate demonstrates improvement in hormone levels
A 2014 Phase II RCT investigated the effects of oral EC—a trans-isomer of CC—compared to topical testosterone 1% gel (T gel) in 124 men with secondary hypogonadism.3 Entry criteria included a baseline morning total testosterone level of < 250 ng/dL on 2 occasions. Participants were divided into 4 groups: 12.5-mg dose of EC, 25-mg dose of EC, T gel, and placebo.
The EC groups and the T gel group had comparable increases in testosterone levels after 3 months of treatment, without statistical significance. The 3-month change in serum testosterone level from baseline was 217 to 471 ng/dL (95% CI, 399-543) in the 12.5-mg dose group; 209 to 405 ng/dL (95% CI, 349-462) in the 25-mg dose group; and 210 to 462 ng/dL (95% CI, 359-565) in the T gel group. The placebo group had a decrease in serum testosterone levels, from 213 to 198 ng/dL (95% CI, 171-226).
Also, the EC groups demonstrated increases in LH and FSH levels from baseline to 3 months, while the T gel group showed a suppression (to low-normal range) in both levels: LH, 1.4 mIU/mL (decrease of 4.4 mIU/mL) and FSH, 2.4 mIU/mL (decrease of 2.4 mIU/mL). Among a subset of men (n = 67) who had at least 2 assessments at the end of 3 months, the researchers also analyzed changes in sperm concentration, using the lower limit of normal (15 million/mL). The number of men with a low sperm concentration increased significantly in the topical T gel group (16% to 53%) compared to the 12.5-mg EC group (decrease from 16% to 12%; P = .0008) and the 25-mg EC group (decrease from 5% to 0%; P = .0007), as well as compared to the placebo group (increase from 8% to 15%; P = .007).
With EC, testosterone remains elevated after treatment cessation
A 2016 2-center parallel, double-blind, placebo-controlled RCT evaluated the effect of 2 doses of EC (12.5 mg and 25 mg; n = 85) vs testosterone gel (1.62%; n = 85) vs placebo (n = 86) on serum testosterone, LH, FSH, and sperm counts in 256 overweight and obese men ages 18 to 60 years who had 2 morning testosterone measurements < 300 ng/dL and a low or inappropriately normal LH level for 16 weeks.4 All baseline characteristics, including age, BMI, sperm concentration, and serum total testosterone were statistically consistent within groups at both centers. For men receiving EC who did not achieve a testosterone level > 450 ng/dL, there was an up-titration from 12.5 mg to 25 mg at Week 4.
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