Glossary · Treatments

Topical / transdermal HRT

Also called: Through-the-skin HRT.

Definition: Transdermal HRT delivers estrogen through the skin via patch, gel, spray, or body cream. Because it bypasses first-pass hepatic metabolism, transdermal estrogen does not increase venous thromboembolism risk to the degree oral estrogen does. Most modern menopause guidelines prefer transdermal estradiol as a first-line systemic estrogen.

Detailed definition

Transdermal estrogen formulations include patches, gels, sprays, and body creams. Estradiol delivered through the skin reaches systemic circulation directly, bypassing the gut and liver and producing relatively steady serum levels. The mechanism for the lower thrombotic risk is the absence of first-pass hepatic stimulation of clotting factor and SHBG synthesis. Multiple observational studies (including the ESTHER and MEGA studies) show that transdermal estradiol does not significantly raise VTE risk in postmenopausal women, while oral estrogen produces a roughly 2-fold elevation. Transdermal estradiol also has a more favorable triglyceride profile than oral and may have a smaller effect on hepatic-derived inflammatory markers. NAMS, the Endocrine Society, the British Menopause Society, and the International Menopause Society all favor transdermal as the preferred systemic estrogen route, particularly for women with VTE risk factors.

Why it matters in menopause

For most women, the question is not "should I use HRT" but "which route." Transdermal is the modern default. ClearedRx defaults to transdermal estradiol unless a patient strongly prefers oral or has a specific reason to use it.

Sources

External references: Wikipedia.

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