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An estrogen patch, or oestrogen patch, is a transdermal delivery system for estrogens such as estradiol and ethinylestradiol which can be used in menopausal hormone therapy, feminizing hormone therapy for transgender women, hormonal birth control, and other uses. [1]
A single such injection results in estradiol levels of about 1,250 pg/mL at peak and levels of around 200 pg/mL after 7 days. [27] [28] Dosages of estrogens can be reduced after an orchiectomy or sex reassignment surgery, when gonadal testosterone suppression is no longer needed. [5]
Estradiol injectables are generally well-tolerated and convenient, requiring infrequent administration. [127] [128] However, this form of estradiol does not release estradiol at a constant rate and there are very high circulating estradiol levels soon after injection followed by a rapid decline in levels. [127] Injections may also be painful. [127]
Estradiol levels with 50 to 100 μg/day transdermal estradiol patches applied to the forearm and to the scrotum in a crossover study in 2 men with prostate cancer. [14] In 35 men treated continuously with one 100 μg/day estradiol patch scrotally, the mean estradiol level was ~500 pg/mL (range ~125–1,200 pg/mL).
Estradiol benzoate: 0.5 mg 1x/week: 1 mg 1x/week: 1.5 mg 1x/week SC implant: Estradiol: 25 mg 1x/6 months: 50 mg 1x/6 months: 100 mg 1x/6 months Footnotes: a = No longer used or recommended, due to health concerns. b = As a single patch applied once or twice per week (worn for 3–4 days or 7 days), depending on the formulation.
In other words, a 100 μg/day Climara estradiol patch may be expected to produce circulating estradiol levels of around 100 pg/mL. [205] Transdermal estradiol patches produce an estradiol to estrone ratio of about 1:1. [10] [12] Following removal of an estradiol patch, circulating estradiol levels decrease to baseline within 24 hours. [10]
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