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AndroGel (Testosterone Topical) Gynecomastia: Alternatives Without This Side Effect

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At a glance

  • Mechanism / Aromatase converts testosterone to estradiol; estrogens stimulate breast tissue [1][2]
  • Gynecomastia, 180-day trial / 1% at 50 mg, 0% at 75 mg, 3% at 100 mg [3]
  • Gynecomastia, 3-year extension / 2.5% of 162 men [3]
  • Breast pain, 180-day trial / 1%, 3% and 1% across the same dose groups [3]
  • Pellets / Estradiol rose significantly with 10 to 12 pellets, not with 6 to 9 [4]
  • Medical management described in reviews / Aromatase inhibitors and tamoxifen [5]
  • Clomiphene series / Testosterone rose from 228 to 612 ng/dL at 1 year in 46 men [6]

Why does testosterone cause gynecomastia?

Aromatase converts androgens to estrogens, and it is expressed in male tissues including Leydig cells, the seminiferous epithelium and other male organs [1]. Testosterone is a substrate for it. Gynecomastia is enlargement of male breast tissue, and most cases come from deficient androgen action or excessive estrogen action in the breast: estrogens stimulate breast growth and androgens inhibit it [2].

How often does gynecomastia occur with testosterone gel?

In the 180-day Phase 3 trial in the generic testosterone gel 1% label, gynecomastia judged at least possibly related to treatment was reported in 1% of 77 men on 50 mg, 0% of 40 men on 75 mg and 3% of 78 men on 100 mg; breast pain in 1%, 3% and 1% [3]. The 3-year flexible-dose extension study of 162 men reported gynecomastia in 2.5% [3]. The rates did not climb steadily with dose.

Do other testosterone formulations carry less gynecomastia risk?

No cited study compared gynecomastia rates between formulations. The clearest formulation data concern pellets: in a retrospective review of 273 men treated with subcutaneous testosterone pellets, estradiol rose significantly in men receiving 10 to 12 pellets but not in men receiving 6 to 9, and the authors suggested the higher estradiol with more pellets may reflect increased aromatization of testosterone [4]. That review measured estradiol, not breast outcomes.

What does the generic gel 1% label say about gynecomastia?

On that label, gynecomastia and breast pain both appear among adverse reactions judged at least possibly related to treatment [3]. The label contraindicates the gel in men with carcinoma of the breast or known or suspected prostate cancer [3].

What can be done about gynecomastia that develops?

Evaluation starts with history and examination to separate glandular breast enlargement from fat tissue, followed by imaging and laboratory testing as needed [10].

A 2025 review of testosterone adverse effects says raised estrogen levels and gynecomastia on testosterone replacement are usually managed with aromatase inhibitors and tamoxifen [5]. A 2004 case report described two men on testosterone replacement whose gynecomastia was successfully treated with the aromatase inhibitor anastrozole, and noted that gynecomastia has traditionally been treated with surgery, radiation or discontinuation of testosterone [11].

What about clomiphene as an alternative?

Clomiphene citrate is a selective estrogen receptor modulator taken as a tablet. In a single-center review, 46 men with hypogonadism (mean age 44) took clomiphene for more than 12 months; serum testosterone was 228 ng/dL at baseline, 612 ng/dL at 1 year, 562 ng/dL at 2 years and 582 ng/dL at 3 years, and no adverse events were reported by any patient [6]. That series had no placebo comparison, and its abstract does not report breast outcomes.

Frequently asked questions

How common is gynecomastia on testosterone gel?
In the generic testosterone gel 1% label, gynecomastia judged at least possibly related to treatment was reported in 1% of men on 50 mg, 0% on 75 mg and 3% on 100 mg in a 180-day trial, and in 2.5% of 162 men in a 3-year extension study [3].
Which testosterone form is least likely to cause gynecomastia?
No cited study compared forms for gynecomastia. In a review of 273 men on testosterone pellets, estradiol rose significantly with 10 to 12 pellets but not with 6 to 9 [4].
Can an aromatase inhibitor treat gynecomastia from testosterone gel?
Reviews describe aromatase inhibitors and tamoxifen as the usual medical management of gynecomastia on testosterone replacement [5], and a case report described two men on testosterone whose gynecomastia was successfully treated with anastrozole [11].
Does clomiphene avoid gynecomastia?
In a review of 46 men treated with clomiphene for more than 12 months, testosterone rose from 228 to 612 ng/dL and no adverse events were reported by any patient [6]. That single-center series had no placebo comparison and does not show that clomiphene prevents gynecomastia.
Does the gel label list gynecomastia?
The generic testosterone gel 1% label lists gynecomastia and breast pain among adverse reactions judged at least possibly related to treatment [3].

References

  1. Cooke PS, Nanjappa MK, Ko C, Prins GS, Hess RA. Estrogens in Male Physiology. Physiol Rev. 2017;97(3):995-1043. Estrogens in Male Physiology
  2. Narula HS, Carlson HE. Gynaecomastia--pathophysiology, diagnosis and treatment. Nat Rev Endocrinol. 2014;10(11):684-98. Gynaecomastia--pathophysiology, diagnosis and treatment
  3. U.S. National Library of Medicine, DailyMed. Testosterone gel 1% topical (generic) prescribing information, effective 2025-09-30. Testosterone gel 1% topical prescribing information
  4. Pastuszak AW, Mittakanti H, Liu JS, Gomez L, Lipshultz LI, Khera M. Pharmacokinetic evaluation and dosing of subcutaneous testosterone pellets. J Androl. 2012;33(5):927-37. Pharmacokinetic evaluation and dosing of subcutaneous testosterone pellets
  5. Basheer B, Ila V, Barros R, Mesquita F, Lopes LS, Lima VFN, et al. Management of Adverse Effects in Testosterone Replacement Therapy. Int Braz J Urol. 2025;51(3). Management of Adverse Effects in Testosterone Replacement Therapy
  6. Moskovic DJ, Katz DJ, Akhavan A, Park K, Mulhall JP. Clomiphene citrate is safe and effective for long-term management of hypogonadism. BJU Int. 2012;110(10):1524-8. Clomiphene citrate is safe and effective for long-term management of hypogonadism
  7. Longcope C, Pratt JH, Schneider SH, Fineberg SE. Aromatization of androgens by muscle and adipose tissue in vivo. J Clin Endocrinol Metab. 1978;46(1):146-52. Aromatization of androgens by muscle and adipose tissue in vivo
  8. De Sanctis V, Soliman AT, Daar S, Di Maio S. Adverse events during testosterone replacement therapy in 95 young hypogonadal thalassemic men. Acta Biomed. 2019;90(2):228-232. Adverse events during testosterone replacement therapy in 95 young hypogonadal thalassemic men
  9. Spratt DI, Stewart II, Savage C, Craig W, Spack NP, Chandler DW, et al. Subcutaneous Injection of Testosterone Is an Effective and Preferred Alternative to Intramuscular Injection: Demonstration in Female-to-Male Transgender Patients. J Clin Endocrinol Metab. 2017;102(7):2349-2355. Subcutaneous Injection of Testosterone Is an Effective and Preferred Alternative to Intramuscular Injection: Demonstration in Female-to-Male Transgender Patients
  10. Johnson RE, Murad MH. Gynecomastia: pathophysiology, evaluation, and management. Mayo Clin Proc. 2009;84(11):1010-5. Gynecomastia: pathophysiology, evaluation, and management
  11. Rhoden EL, Morgentaler A. Treatment of testosterone-induced gynecomastia with the aromatase inhibitor, anastrozole. Int J Impot Res. 2004;16(1):95-7. Treatment of testosterone-induced gynecomastia with the aromatase inhibitor, anastrozole
  12. Leder BZ, Rohrer JL, Rubin SD, Gallo J, Longcope C. Effects of aromatase inhibition in elderly men with low or borderline-low serum testosterone levels. J Clin Endocrinol Metab. 2004;89(3):1174-80. Effects of aromatase inhibition in elderly men with low or borderline-low serum testosterone levels
Evidence overview for AndroGel (Testosterone Topical) Gynecomastia: Alternatives Without This Side Effect