Estradiol undecylenate

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Estradiol undecylenate is a synthetic ester of the natural estrogen, estradiol. It is used in hormone replacement therapy (HRT) and for various other medical purposes. Estradiol undecylenate is administered via intramuscular injection and is known for its long-lasting effects.

Chemical Structure and Properties

Estradiol undecylenate is the undecylenate ester of estradiol, a form of estrogen. The chemical structure of estradiol undecylenate allows it to be slowly released into the bloodstream, providing a prolonged duration of action compared to other forms of estradiol.

Medical Uses

Estradiol undecylenate is primarily used in hormone replacement therapy for menopausal symptoms, such as hot flashes, vaginal atrophy, and osteoporosis. It is also used in the treatment of hypogonadism in women and as part of feminizing hormone therapy for transgender women.

Pharmacokinetics

When administered via intramuscular injection, estradiol undecylenate is slowly absorbed into the bloodstream. This slow absorption results in a sustained release of estradiol, maintaining stable blood levels over an extended period. The half-life of estradiol undecylenate is significantly longer than that of other estradiol esters, making it suitable for less frequent dosing.

Side Effects

Common side effects of estradiol undecylenate include nausea, breast tenderness, and headache. More serious side effects can include an increased risk of thrombosis, stroke, and breast cancer. Patients are advised to discuss the risks and benefits of estradiol undecylenate with their healthcare provider.

Contraindications

Estradiol undecylenate is contraindicated in individuals with a history of breast cancer, estrogen-dependent tumors, thromboembolic disorders, and liver disease. It should not be used during pregnancy.

See Also

• Estradiol
• Hormone replacement therapy
• Menopause
• Transgender hormone therapy

External Links

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