Cyproterone Acetate Therapeutic Applications and Considerations

Mechanism of Action and Pharmacological Effects

Cyproterone acetate acts through dual mechanisms: direct competitive inhibition of androgen receptor binding and negative feedback on the hypothalamic-pituitary axis to suppress testosterone production 2, 1
Cyproterone acetate creates feedback inhibition of pituitary LHRH release, thereby suppressing testosterone production 1

Cyproterone acetate is available in Canada and Europe for treatment of androgen-sensitive metastatic prostate cancer 1, 2
In prostate cancer treatment, cyproterone acetate shows no significant survival difference compared to diethylstilbestrol, but with fewer cardiovascular side effects 1
When used alone, cyproterone acetate is less effective than goserelin in delaying progression of metastatic prostate cancer 1, 3
Cyproterone acetate can reduce tumor flare when initiating LHRH agonist therapy for prostate cancer 1

Cyproterone acetate is used as an antiandrogen component in gender-affirming hormone therapy for transgender women/transfeminine individuals 4

Cyproterone acetate is generally well tolerated, but liver toxicity has been recognized as a complication of long-term use 1, 3
Cyproterone acetate should be avoided in patients with hereditary angioedema as it may worsen the condition 5
Caution is advised in patients with liver disease due to potential hepatotoxicity 1, 3
The American College of Clinical Endocrinologists and other guideline societies may recommend caution when using cyproterone acetate in combination with estrogens in patients with a history of thromboembolic disorders, although the specific guideline is not directly referenced here 6