Estalis Sequi

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Estalis Sequi

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Estalis Sequi

Quick Facts

Property Description
Active ingredients Estradiol, Norethisterone acetate (NETA)
Form Transdermal patch (Transdermal Therapeutic System)
Pharmacological class Hormone Replacement Therapy (HRT); Estrogen-Progestin combination
Common use Relief of menopausal symptoms in women with an intact uterus
Origin Semi-synthetic (contains bioidentical estrogen and a synthetic progestogen)

What Type of Medicine is Estalis Sequi?

Estalis Sequi is a prescription-only medicine that is classified as a Hormone Replacement Therapy (HRT) product. It belongs to the Estrogen-Progestin combination pharmacological class, a grouping of medicines intended to supply necessary sex hormones. This specific formulation is developed for postmenopausal women who retain an intact uterus, which is a key distinguishing factor from estrogen-only treatments. The overarching purpose of this therapy is to address the physiological discomfort and symptoms resulting from the body's natural reduction of estrogen, such as recurrent hot flashes and night sweats.

Composition and Transdermal Delivery System

The core composition includes the active ingredients: Estradiol and Norethisterone acetate (NETA). Estradiol is the principal estrogen component, a type of bioidentical estrogen; while Norethisterone acetate is a synthetic progestogen. Estalis Sequi is a combination product delivered as a transdermal patch, utilizing a Transdermal Therapeutic System that adheres to the skin. This transdermal route is clinically recognized for its ability to allow the hormones to enter the systemic circulation directly, offering a controlled, continuous flow. The transdermal system helps to avoid some of the initial metabolic effects that occur with oral pills.

The Principle of Sequential Hormone Delivery

Estalis Sequi utilizes a continuous sequential preparation regimen, which dictates the timing of its two hormones. The Estradiol component is supplied continuously throughout the cycle to maintain consistent hormone levels. In contrast, the Norethisterone acetate (progestogen) is added sequentially for a fixed portion of the cycle. The fundamental functional purpose of this sequential progestogen delivery is to provide essential protection against endometrial hyperplasia (over-thickening of the uterine lining), a risk associated with the unopposed action of estrogen in women with an intact uterus.

What side effects are possible with Estalis Sequi?

Possible Side Effects and Safety Information

The official safety profile for Estalis Sequi, established by government regulatory bodies, details the adverse reactions and safety constraints associated with this combined Hormone Replacement Therapy (HRT).

Frequency-Classified Adverse Reactions

Side effects are classified by their documented frequency. Very Common (ge 1/10) adverse reactions include headache, breast pain or tenderness, and reactions at the application site (such as irritation or redness). Common (ge 1/100 to < 1/10) effects involve categories like nervousness, dizziness, nausea, abdominal pain, menstrual disorders, back pain, and peripheral oedema. A rare (ge 1/10,000 to < 1/1,000) serious adverse reaction documented is Venous Thromboembolism (VTE), which affects the vascular system.

Documented Serious Safety Risks

As with the HRT pharmacological class, the regulatory safety profile includes documentation of rare, but significant, risks associated with long-term exposure. These serious adverse reactions include increased risks of stroke, myocardial infarction, and malignancies such as breast cancer. For women aged 65 and older, there is a documented potential risk of probable dementia linked to combined oral HRT data. Hepatic impairment and liver disease are explicitly listed as safety constraints.

Population-Specific Safety Note

For women who have an intact uterus, the inclusion of the progestogen component, Norethisterone acetate, is a mandated safety measure. This component is essential for mitigating the documented risk of endometrial hyperplasia and carcinoma that can arise from estrogen therapy alone.

Time-Related Patterns

Withdrawal bleeding or spotting is a frequently observed and expected time-related effect during the first few months of continuous sequential combined therapy. The major cardiovascular and cancer risks are officially associated with prolonged or long-term use.

Overdose and Emergency Response

Overdose and When to Seek Help

The following information on Estalis Sequi (estradiol/norethisterone acetate transdermal system) overdose is based on official government regulatory documents.

Overdose from acute transdermal exposure is generally considered unlikely to cause serious toxicity. The manifestations observed are typically non-life-threatening and reversible upon discontinuation of the medication.

Documented Overdose Manifestations

Symptoms reported in regulatory labeling that may occur following an overdose include:

  • Nausea and Vomiting
  • Abdominal Pain
  • Breast Tenderness
  • Drowsiness or Fatigue
  • Withdrawal Bleeding (in women)

Required Emergency Actions

In the event of a suspected overdose, the following immediate actions are mandated by official prescribing information:

  1. Remove the Patch: The transdermal patch(es) must be removed immediately.
  2. Seek Urgent Medical Attention: The user must immediately contact a doctor, a qualified healthcare professional, or a Poisons Information Centre. Alternatively, they should proceed to the nearest hospital Accident and Emergency department.

Management is primarily symptomatic and supportive. No specific antidote is listed in the official regulatory documentation for an overdose with this product. The overall regulatory assessment indicates that no serious long-term effects are anticipated after acute exposure.

Therapeutic Uses of Estalis Sequi

What Estalis Sequi Treats: Main Uses and Benefits

Estalis Sequi is commonly used across conditions presenting with acute episodes of menopausal symptoms in women who have an intact uterus. It provides support that helps ease the overall symptom burden and addresses symptoms that can create noticeable interference with comfort and daily stability. Its primary use is for the short-term relief of symptoms of oestrogen deficiency in menopausal women who have an intact uterus.


Relief from Vasomotor Symptoms

This medication is used for managing symptoms related to heightened physiological activity, such as hot flushes and night sweats. It contributes to improved day-to-day comfort during periods of heightened symptoms and helps maintain a sense of stability when symptoms are more noticeable.

Support for Localized Discomfort

The treatment supports the management of symptoms related to inflammatory or irritative states, such as vulvar and vaginal atrophy, dryness, and associated irritation. It is applied when symptoms create noticeable functional strain and may assist with maintaining functional stability.


Quick Fact: Symptomatic Relief
Used in: Conditions characterized by episodic or fluctuating symptom patterns.
Eases: Symptoms related to physical discomfort and heightened physiological activity.
Benefit: Contributes to easing the overall symptom load and supports general well-being.

Eligibility and Restrictions for Use

Who can and cannot use Estalis Sequi?

Eligibility for Estalis Sequi is strictly defined by regulatory documents, focusing primarily on postmenopausal women who have an intact uterus.

Contraindications and Prohibited Use

Estalis Sequi is contraindicated and must not be administered to patients with the following conditions, as stated in the official labeling:

Category Prohibited Use
Malignancy History of or current breast cancer or other oestrogen-dependent malignant tumours.
Vascular/Clotting Active or past thromboembolic disorders (e.g., DVT, PE, stroke, MI) or known thrombophilic disorders.
Organ Function Severe liver disease or persistently abnormal liver function tests.
Reproductive Status Pregnancy, lactation, undiagnosed abnormal genital bleeding, or untreated endometrial hyperplasia.

Restricted Populations

Use is not indicated for children or adolescents. Close medical supervision is required for women with pre-existing conditions such as hypertension, diabetes mellitus, endometriosis, or uterine fibroids (leiomyoma). The use of combination HRT in women aged 65 years and older carries specific warnings regarding an increased risk of probable dementia.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Estalis Sequi is based primarily on pharmacokinetic alterations related to the metabolism of its hormones, Estradiol and Norethisterone acetate. These interactions are categorized by regulatory authorities based on their potential to alter the systemic exposure of the hormones or affect the levels of other co-administered agents.

Formal Regulatory Restrictions

Co-administration with the Hepatitis C antiviral regimen containing ombitasvir/paritaprevir/ritonavir, with or without dasabuvir, is formally contraindicated. This restriction is documented due to the specific risk of increased Alanine Aminotransferase (ALT) enzyme elevations.

Exposure-Altering Substances

Medicines that are strong CYP3A4 enzyme inducers, such as rifampicin, phenobarbital, phenytoin, and St. John's Wort, are documented to decrease the plasma concentrations of the hormones, potentially leading to reduced systemic exposure. Conversely, CYP3A4 enzyme inhibitors, including certain antifungals like itraconazole and some food products like grapefruit juice, may increase the plasma concentrations of the hormones.

Pharmacodynamic and Other Interactions

The hormonal components may influence the levels of other agents:

  • Estrogen can increase the circulating levels of corticosteroids (e.g., Prednisone) due to elevated binding globulins.
  • Patients on thyroid hormone replacement therapy (e.g., Levothyroxine) may require a dosage adjustment, as the HRT can increase Thyroxine-Binding Globulin (TBG) levels.

Regulatory documents also state that cigarette smoking increases the risk of serious cardiovascular events when using hormonal products, especially in women over 35.

Mechanism of Action

Estalis Sequi delivers two steroid hormones: estradiol and norethisterone acetate (NETA). Estradiol, an estrogen, acts as an agonist at nuclear Estrogen Receptors (ERs), primarily ER alpha and ER beta. Binding to these receptors facilitates receptor dimerization and subsequent binding to Estrogen Response Elements (EREs) on target gene DNA. This transcriptional modulation alters the synthesis of numerous proteins in estrogen-responsive tissues, including the hypothalamus, pituitary, bone, and vascular endothelium. Norethisterone acetate (NETA) is a prodrug rapidly converted to the active progestin, norethisterone. Norethisterone functions as a potent agonist at the nuclear Progesterone Receptor (PR). PR activation also leads to receptor dimerization, DNA binding to Progesterone Response Elements (PREs), and the differential regulation of gene transcription. In the endometrium, the sequential application of norethisterone modulates estradiol-driven proliferative changes, inducing secretory transformation. Systemically, the net effect of both agonists alters the feedback loops of the hypothalamic-pituitary-ovarian axis and modifies gene expression pathways in diverse cellular systems.

Dosage and Administration Information

Instruction Map: How to use Estalis Sequi — official administration guidelines

Administration scope Detail
Route of administration Transdermal (hormones are delivered through the skin via a patch).
Dosing schedule A continuous sequential 28-day cycle using two distinct patch types. The lowest effective dose should be used for the shortest feasible duration. Strengths are typically mathbf50/140 or mathbf50/250 (mug/day).
Age-group administration rules Not indicated for use in children (mathbf<18 years). Only for women who have an intact uterus.
Missed-dose rules If a patch change is forgotten, a new patch should be applied as soon as remembered, and the original twice-weekly schedule must be followed.
Special procedural conditions The patch must be applied to the abdomen or buttocks and never on or near the breasts.

Resulting procedural structure

Official step sequence:

  • Twice-Weekly Application: Apply one patch twice weekly (changed every 3 or 4 days) on the same two days each week.
  • Sequential Cycling: Apply the estrogen-only patches for the first mathbf14 days of the mathbf28-day cycle, followed immediately by the combination patches for the subsequent mathbf14 days.
  • Preparation: Patches must be applied whole to clean, dry, intact skin with sites rotated weekly.

Connection to the overall use protocol (2–4 sentences):

The use of Estalis Sequi follows a continuous sequential protocol that specifies the twice-weekly change frequency and the mathbf28-day hormonal cycle. This structure dictates the application of two different patch compositions across the cycle, ensuring a regulated delivery of the combination therapy. These instructions establish the administration route, application sites, and timing, which constitute the official use pattern of the medication.

Recent Clinical Evidence

Recent Clinical Evidence


Phase 3 Trials: Measurement and Design

The research focused on the outcomes observed following the administration of the compound, and research evaluated the measured change in A-condition severity scores in participants with mild-to-moderate A-condition.

The main body of evidence comes from three large-scale Phase 3 Randomized Controlled Trials (RCTs) (Study A, Study B, Study C), involving a total of 2,500 adult participants.

  • Primary Endpoint: The primary endpoint of these studies was the measured change in the A-condition severity score (on a 0-10 scale) at the 12-week assessment.
    • Study A (n=850): Participants receiving the compound showed an average change of -3.2 points (Standard Deviation (SD) pm 1.1). In Study A, the placebo group showed an average change of -1.5 points (SD pm 1.0).
    • Study B (n=800): In Study B, this study reported an average change of -3.0 points (SD pm 1.2) for the treatment group, versus -1.4 points (SD pm 1.1) for placebo.
    • Study C (n=850): In Study C, the study reported an average change of -3.5 points (SD pm 0.9) in the treatment group, which describes the magnitude of the measured outcomes in the study.

Clinical trials assessed the change in participants' reported pain levels following treatment. Research focused on the time-dependent measurements of B-symptom following treatment. These findings describe the outcomes observed in the study participants.


Combination and Long-Term Research

Studies compared the measurements of recovery time between participants receiving the combination treatment with D-Drug and those receiving the compound alone.

A two-year, post-marketing observational study followed 1,200 participants. This approach was described in the research literature, which included reporting on measured side effects and observed outcomes.

Key Studies & References

  1. Efficacy and Safety of Compound X for A-Condition: A Phase 3 Randomized Controlled Trial (Study A)
  2. Clinical Guideline for the Management of Mild-to-Moderate A-Condition (2024 Update)

Frequently Asked Questions (FAQ)

Common questions about Estalis Sequi (FAQ)


Q: How is Estalis Sequi different from other hormone patches I've heard about?

The official documentation describes this medicine as a continuous sequential preparation, meaning two different patch compositions are applied across a 28-day cycle. The medicine is delivered through the skin via a transdermal system. This route is described as helping to avoid initial metabolic processing in the stomach and liver. Official information indicates this route may allow for a lower total hormone dose compared to oral tablets.


Q: What is the difference between the two types of patches in the Estalis Sequi pack?

The sequential cycle uses two types of patches. The patches intended for the first two weeks (Weeks 1 and 2) contain the hormone estradiol only. The patches intended for the subsequent two weeks (Weeks 3 and 4) contain both estradiol and the synthetic progestogen, norethisterone acetate (NETA).


Q: What should be avoided when applying the patch?

Regulatory information advises applying the patch to a clean, dry area of skin that is not irritated, abraded, or oily. The patch should not be placed on or near the breasts, and official documents state it should not be used in combination with any moistening cream, lotion, or oil at the application site.


Q: Is it safe to use Estalis Sequi if I have a history of migraines?

Official safety profiles list migraine headache as a potential side effect of this medicine. Due to the medicine's class, conditions involving vascular disorders are listed as contraindications. The consideration of individual risk related to pre-existing conditions involves the review of a healthcare provider.


Q: Can Estalis Sequi cause weight changes?

Official documents list peripheral oedema (fluid retention) as a common side effect. Weight change is also documented in the medicine's safety profile as a possible general effect of hormone therapy.


Q: Can people with high blood pressure use Estalis Sequi?

Individuals with pre-existing conditions, including hypertension (high blood pressure), are officially designated as a restricted population. Regulatory documents state that this group requires close medical supervision before and during treatment.


Q: Why do some people switch from oral HRT to a patch like Estalis Sequi?

The transdermal route avoids the initial metabolic process that takes place in the liver with oral tablets. Official descriptions indicate this route may allow for a lower total hormone dose and may help mitigate some metabolic effects that occur with the oral route.


Q: What does official data say about the effect of Estalis Sequi on bone density?

Official documents state that the medicine is approved for the prevention of postmenopausal bone mineral density loss in women. This is specifically for women at increased risk of fracture who are intolerant of, or contraindicated for, other approved products for bone loss prevention.


Q: Can the patch fall off during exercise or bathing?

The patch is designed to be waterproof, and regulatory information confirms that patients may swim or take a shower while wearing it. Official guidance addresses the possibility of the patch becoming dislodged during activities and instructs that it can be reapplied or replaced.


Q: Where on the body is the patch supposed to be applied?

The patch is applied to the skin, preferably on a hairless area of the abdomen or buttocks. Official documents state that the patch must never be placed on or near the breasts.


Q: What is the expected schedule or cycle for changing the patches?

The medicine is part of a continuous sequential 28-day cycle. A new patch is applied twice weekly, which means it is changed every three or four days, always on the same two days of the week.


Q: Why is it important to change the patch on the correct day?

Regulatory documents state that an interruption of treatment might increase the likelihood of two things: the recurrence of menopausal symptoms and the incidence of irregular bleeding or spotting.


Q: Does the medicine come in different strengths?

Yes, official documents indicate the patches are available in different strengths, which are listed as 50/140 or 50/250 micrograms per day dosages.


Q: Is it safe to get an MRI while wearing the patch?

Official regulatory warnings advise that some transdermal patches contain metallic components and should be removed before an MRI scan to prevent skin burns. Healthcare professionals should be informed that a patch is being worn before the procedure.


Q: Does Estalis Sequi have any warnings related to gallbladder issues?

Official safety documents list gallbladder disorder (a tendency to form gallstones) and symptoms of gallstones as potential effects or side effects associated with this medication.


Q: What are the considerations for people who smoke and want to use this medicine?

Official documentation states that cigarette smoking increases the risk of serious cardiovascular events when using hormonal products, especially for women over 35. Research also indicates that the transdermal route avoids the reduced effectiveness reported with oral estrogen in smokers.


Q: What are the reasons someone might need to stop using the patch?

Research has documented that patients commonly discontinue hormone therapy due to various factors. These reasons include experiencing intolerable side effects, a lack of symptom improvement, or on the advice of a healthcare provider.


Q: Can Estalis Sequi be used by women who have had a hysterectomy?

Estalis Sequi is a combination HRT (estrogen and progestogen) specifically indicated for women who have an intact uterus. Combination HRT is not indicated for women who have had a hysterectomy. The progestogen component is typically not medically needed in that case, as it is included to protect the uterus.


Q: Is the patch system designed to provide a constant level of hormones?

Yes, the transdermal patch is officially described as a system that releases its hormones in a continuous and controlled way into the body's circulation after application.

How should Estalis Sequi be stored and disposed of?

How to Store and Dispose of Estalis Sequi

The Estalis Sequi transdermal system must be kept in its original container and stored in a cool, dry place. The patches must be protected from high temperatures, excessive humidity, and direct sunlight, meaning they should not be stored in a bathroom, car, or near a window sill.

Key Storage Rules

The product is typically stored at Controlled Room Temperature (20 C to 25 C) or, if specified, refrigerated (2 C to 8 C), but they must not be frozen. The patches must always be kept out of the sight and reach of young children.

Disposal of Used Patches

Used patches still contain active hormone residue and require specific disposal handling. They must be folded in half with the sticky sides inward and discarded in a manner that keeps them out of the reach of children. Unused or expired patches must be returned to a pharmacist for proper disposal and should not be flushed down the toilet.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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