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Hormone Patch: Effects, Uses & Side Effects

A hormone patch is a transdermal patch used in hormone replacement therapy, delivering oestrogen or progestogen through the skin, typically used to treat menopausal symptoms.

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Things worth knowing about "Hormone patch"

A hormone patch is a transdermal patch used in hormone replacement therapy, delivering oestrogen or progestogen through the skin, typically used to treat menopausal symptoms.

What is a Hormone Patch?

A hormone patch (also called a transdermal hormone patch) is a medicated adhesive patch that delivers female sex hormones – most commonly oestrogen or a combination of oestrogen and progestogen – directly through the skin into the bloodstream. This method of drug delivery is known as transdermal application. Because the hormones bypass the digestive tract and the liver, the hormone patch works differently from oral hormone preparations.

Indications

Hormone patches are primarily used as part of hormone replacement therapy (HRT). The most common indications include:

Menopausal symptoms (climacteric): Relief of hot flushes, sleep disturbances, mood changes, and vaginal dryness.
Osteoporosis prevention: Protecting bone density in postmenopausal women.
Hormone deficiency following surgical removal of the ovaries (ovarian insufficiency).
Early menopause (before the age of 45).

Mechanism of Action

The hormone patch contains a reservoir of active ingredient that is released continuously and evenly through the skin over a defined period – typically 3 to 7 days. The hormones pass directly into the bloodstream, bypassing the gastrointestinal tract. This means that lower doses are generally sufficient and fluctuations in hormone levels are reduced. The active ingredient most commonly used is oestradiol, the bio-identical form of the body's own oestrogen.

Application and Dosage

The patch is applied to clean, dry, and hairless skin, such as the abdomen, hip, or buttocks. Depending on the product, the patch is changed every 3 to 7 days. Women with an intact uterus also receive a progestogen to minimise the risk of endometrial hyperplasia (thickening of the uterine lining). The dosage is determined individually by a healthcare professional based on symptoms and medical history.

Important Application Notes

Do not apply to irritated, broken, or heavily moisturised skin.
Rotate the application site with each patch change to avoid skin irritation.
Press the patch firmly to ensure it adheres during bathing or exercise.
If the patch comes off accidentally, apply a new one immediately.

Advantages Over Oral Hormones

Because hormones delivered transdermally do not pass through the liver, the risk of certain side effects – such as increased blood clotting tendency and therefore venous thromboembolism – is lower than with oral preparations. Hormone patches are therefore particularly suitable for women with an elevated risk of thrombosis or those with liver conditions.

Side Effects

Like all medications, hormone patches can cause side effects. The most common include:

Local: Skin irritation, redness, or itching at the application site.
Systemic: Breast tenderness, headaches, nausea, fluid retention.
Rare: Mood changes, irregular bleeding (especially during the first months of use).

Contraindications and Precautions

Hormone patches are not suitable for women with:

Known or suspected oestrogen-dependent tumours (e.g., breast cancer, endometrial cancer).
Active or previous venous thrombosis or pulmonary embolism (although the risk is lower than with oral hormones, caution is still warranted).
Unexplained vaginal bleeding.
Pregnancy or breastfeeding.
Severe liver disease.

Individual medical consultation and regular follow-up examinations are essential when using hormone patches.

References

National Institute for Health and Care Excellence (NICE): Menopause: diagnosis and management. NICE Guideline NG23 (2019). Available at: www.nice.org.uk
Canonico M. et al.: Hormone therapy and venous thromboembolism among postmenopausal women: impact of the route of estrogen administration. Circulation, 2007;115(7):840–845.
European Medicines Agency (EMA): Guidelines on hormone replacement therapy. Available at: www.ema.europa.eu

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