Common Drug Causes of Gynecomastia*

Category

Drugs

Antiandrogen drugs (inhibit androgen synthesis or activity)

Cyproterone (an antiandrogen used to treat prostate cancer or transgender females)

prostate cancer)

Antimicrobials

Antineoplastic drugs

Alkylating drugs

GnRH agonists and antagonists

Vinca alkaloids

Antiulcer drugs†

Cardiovascular drugs

Reserpine

CNS-acting drugs

Phenothiazines

Tricyclic antidepressants

Hormones

Androgens

Anabolic steroids

Estrogens

Human growth hormone

OTC herbal drugs

Lavender oil

Tea tree oils

Recreational drugs

Amphetamines

Heroin

Marijuana

Other drugs

Domperidone

* Not all drugs that have been associated with gynecomastia have been shown to cause gynecomastia through challenge-rechallenge testing.

† Drugs are listed in order of frequency of association.

ACE = angiotensin-converting enzyme; CNS = central nervous system; GnRH = gonadotropin-releasing hormone; LH = luteinizing hormone; OTC = over-the-counter.

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