Twirla

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Twirla

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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 Twirla

Quick Facts

Property Description
Active ingredient Levonorgestrel and Ethinylestradiol
Form Transdermal System (Patch)
Pharmacological class Combined Hormonal Contraceptive (CHC)
Common use Prevention of pregnancy (Contraception)
Origin Synthetic

What Type of Medicine is the Twirla Patch?

Twirla is a prescription-only medication classified as a Combined Hormonal Contraceptive (CHC), a class of agents clinically recognized for their high efficacy in preventing pregnancy. This classification means the pharmaceutical form contains a fixed combination of a synthetic estrogen and a synthetic progestin. The product is unique in its delivery method, functioning as a Transdermal System (TDS), or transdermal patch, designed for systemic use via absorption through the skin. This non-daily form offers a differentiated alternative to the daily compliance required by oral hormonal contraceptives.

Composition and Purpose of the Twirla System

The active components in the Twirla system are the synthetic progestin Levonorgestrel (LNG) and the synthetic estrogen Ethinylestradiol (EE). This combination product is integrated into the patch's adhesive matrix for controlled, continuous release. A distinctive characteristic is its low-dose delivery of Ethinylestradiol relative to some other comparable transdermal patches. The sole approved therapeutic purpose of Twirla is the effective and reversible prevention of pregnancy (contraception) for women of reproductive potential whose Body Mass Index (BMI) is less than 30 kg/m^2.

Basic Contraceptive Function

The combination of Levonorgestrel and Ethinylestradiol achieves its goal through multiple concurrent and confirmed physiological actions. The primary action is the suppression of ovulation, effectively inhibiting the monthly release of an egg from the ovary. This effect is substantially augmented by two secondary mechanisms: the hormones cause the thickening of cervical mucus, which creates a physical obstruction to sperm movement, and they induce specific endometrial alterations that reduce the uterine lining's receptivity. These coordinated, multi-target mechanisms ensure the high efficacy of this method of birth control.

Regulatory References

  1. Estrogen and Progestin (Transdermal Patch Contraceptives) Drug Information

What side effects are possible with Twirla?

Possible Side Effects and Safety Information

Critical Safety Warnings

Twirla (a combined hormonal contraceptive) carries a Boxed Warning regarding two major safety risks:

  • Cigarette Smoking and Serious Cardiovascular Events: Use is contraindicated in women over 35 years old who smoke, as this significantly increases the risk of serious cardiovascular events, including blood clots, stroke, and heart attack.
  • Body Mass Index (BMI) Restriction: Use is contraindicated in women with a BMI of 30 kg/m^2 or more due to a higher risk of venous thromboembolism (VTE) or reduced efficacy. Reduced effectiveness has also been noted in women with a BMI of 25 kg/m^2 to less than 30 kg/m^2.

Common and Serious Adverse Reactions

The most common adverse reactions (occurring in ge 2% of participants in clinical trials) include application site disorders (e.g., irritation, rash), nausea, headache, dysmenorrhea (menstrual cramps), and increased weight.

Serious, less common risks associated with combined hormonal contraceptives include the development of venous and arterial thromboembolic disorders (e.g., deep vein thrombosis, pulmonary embolism, myocardial infarction, and stroke), liver disease (including hepatic adenomas and elevated liver enzymes), hypertension, and gallbladder disease.

Contraindications and Monitoring

In addition to the BMI and smoking restrictions, Twirla is contraindicated in women with a high risk of arterial or venous thrombotic disease, history of breast cancer, liver tumors or severe cirrhosis, undiagnosed abnormal uterine bleeding, or certain types of migraine headaches. Monitoring of blood pressure, blood glucose, and lipid levels is generally recommended during use.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose involving Twirla (Levonorgestrel and Ethinyl Estradiol Transdermal System) is related to excessive intake of the hormonal components, which is possible if the patch is not immediately removed upon suspicion of overexposure.

Documented Overdose Presentations

The most common manifestations of overdose, as noted in authoritative regulatory documents, are acute, non-life-threatening symptoms:

  • Nausea
  • Vomiting
  • Withdrawal Bleeding (which may present as spotting or menorrhagia)

Required Emergency Actions

The immediate response to a suspected overdose is critical and focuses on limiting further hormonal exposure and seeking professional medical guidance. These steps are mandated in regulatory labeling:

  1. Remove the Patch: The TWIRLA Transdermal System (TDS) must be immediately removed from the skin to stop the absorption of hormones.
  2. Seek Medical Help: Immediately seek emergency medical attention or call the Poison Help line for instruction.
  3. Symptomatic Management: Following the removal of the patch, symptomatic treatment should be administered to manage any presenting discomfort, such as nausea or vomiting, as guided by a healthcare professional.

Overdose management is supportive; no specific antidote is available for the typical clinical presentations of combined hormonal overdose.

Therapeutic Uses of Twirla

What Twirla Treats: Main Uses and Benefits

Twirla is primarily used to serve as a reversible method for the prevention of pregnancy in women of reproductive potential. This application is relevant in contexts involving continuous reproductive management, which may assist with maintaining comfort in routine activities. The application is relevant for long-term reproductive health management and symptoms related to physical discomfort of daily regimens.

The transdermal system is relevant when additional management of discomfort related to a strict daily regimen is appropriate. The use of a transdermal system contributes to improved comfort during periods of potential adherence complexity. This assists with maintaining general comfort by offering a suitable management option.

This application is also specifically relevant in clinical settings involving the defined patient population of women whose Body Mass Index (BMI) is less than 30 kg/m^2. This targeted use helps patients receive a method of birth control that is considered relevant within their defined physiological profile, supporting general well-being during symptomatic phases.


Quick Fact: Relief for Symptoms that Interfere with Daily Functioning

Feature Benefit Description
Primary Use Is used for managing the need for continuous reproductive management.
Delivery Benefit Helps address symptom clusters related to systemic imbalance of a daily oral regimen.
Patient Context Relevant in clinical settings involving the defined patient population of women whose BMI is less than 30 kg/m^2.

Eligibility and Restrictions for Use

Twirla is approved for use by women of reproductive potential who meet specific eligibility criteria defined by regulatory authorities. The primary eligibility limitation is defined by body weight: the patch is only approved for use in women whose Body Mass Index (BMI) is less than 30 kg/m^2. Regulatory information states that effectiveness is officially documented as reduced if the BMI is between 25 kg/m^2 and 30 kg/m^2.


Who Must Not Use Twirla (Contraindications)

Twirla is contraindicated and must not be used by specific populations due to serious health risks, including:

  • Women over 35 years of age who smoke cigarettes.
  • Women who are pregnant.
  • Women whose BMI is 30 kg/m^2 or greater.
  • Women with a history of or current venous thromboembolism (VTE), stroke, coronary artery disease, or other conditions increasing the risk of blood clots.
  • Women with migraine with aura or those over 35 years of age with any migraine headache.
  • Women with a history of breast cancer or other hormone-sensitive cancers.
  • Women with severe liver disease or liver tumors.

Use is not indicated for postmenopausal women or females before menarche. It is not recommended for women who are breastfeeding.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Twirla is defined by specific drug-drug interaction prohibitions and patient-profile restrictions.

Contraindicated Combinations and Restrictions

Co-administration with certain Hepatitis C combination drug regimens containing ombitasvir/paritaprevir/ritonavir, with or without dasabuvir, is formally contraindicated due to the documented risk of significant liver enzyme elevations (ALT). Use is also prohibited in women with a Body Mass Index (BMI) 30 kg/m^2 because this patient factor is associated with reduced contraceptive effectiveness.

Furthermore, the patch must be discontinued prior to starting the Hepatitis C regimen and must be stopped at least 4 weeks before and through 2 weeks after major surgery or prolonged immobilization.

Impact on Effectiveness and Exposure

Many medicinal products and herbal supplements act as enzyme inducers, including certain anticonvulsants (e.g., carbamazepine, phenytoin), rifamycins (e.g., rifampin), and St. John's Wort. This induction, which often involves the CYP3A4 pathway, is documented to decrease the systemic exposure of the hormonal components, resulting in decreased contraceptive effectiveness and potentially increased breakthrough bleeding. Conversely, the combined hormonal components may also affect co-administered drugs by significantly decreasing the plasma concentrations of lamotrigine due to enhanced metabolic clearance.

Mechanism of Action

The Biochemical Mechanism of Twirla

Twirla's mechanism is driven by the combined action of its active components. The transdermal patch application generates a hormonal profile that results in stable circulating levels of both estrogen and progestin, which modulates the hypothalamic-pituitary-ovarian axis. The primary mechanism of action involves the inhibition of the mid-cycle surge of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) from the pituitary gland. This central action prevents follicular maturation and subsequent ovulation.

The progestin component, levonorgestrel, demonstrates a high binding affinity for the Progesterone Receptor (PR), contributing to central regulation and peripheral effects. A secondary physiological consequence is a change in the cervical mucus, increasing its viscosity and altering sperm transport. This combined cascade results in multiple physiological modulations impacting the reproductive system.

Dosage and Administration Information

Official Administration Guidelines

Twirla is administered as a Transdermal System (TDS) applied topically to the skin. The patch is designed to deliver a continuous daily nominal dose of 120 mcg of Levonorgestrel and 30 mcg of Ethinyl Estradiol over its usage period. The regimen follows a standardized 28-day cyclic schedule.


Frequency and Application

The usage pattern involves applying a single new patch once weekly for three consecutive weeks (21 total days of hormone exposure), followed by a seven-day TDS-Free Week (Week 4), during which no patch is worn. The patch must be changed on the same designated day each week, which establishes the consistent "Patch Change Day." A new cycle begins immediately after the patch-free week ends.

For proper administration, the TDS should be applied only to clean, dry, and intact skin on the abdomen, buttock, or upper torso, avoiding the breasts. The patch should not be cut or altered, and users must rotate the application site to prevent applying a new patch directly over the previous site.

Use-Context and Missed Dosing

The prescribing information establishes a specific use-context constraint: the system is indicated only for women of reproductive potential whose Body Mass Index (BMI) is less than 30 kg/m^2. In cases of a dosing deviation, the patch-free interval must strictly not exceed seven days. If a patch is off for one day or more during the active three weeks, a new 4-week cycle must be initiated, and non-hormonal back-up contraception is required for the first seven days of that new cycle.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Twirla


Evidence on Contraceptive Effectiveness and Primary Trial Design

The clinical research that provides the foundation for the Twirla patch was studied for contraceptive purposes primarily consists of a large, single-arm Phase 3 trial known as the SECURE study. This study was evaluated in over 2,000 women across many centers and was observed in these participants for a period of one year (13 menstrual cycles). The main goal of this research was studied for how well the patch performs in contraception, which is reported by researchers using the Pearl Index (PI)—a calculation of the number of pregnancies that were observed during 100 years of use by a group of women.

Because this research utilized a single-arm design, the studies did not include a randomized comparison against a placebo patch or a different active contraceptive method. The research also examined how reliably the patch stayed adhered to the skin and monitored the stability and predictability of menstrual cycles over the year.


Research Findings on Specific Body Mass Index (BMI) Groups

Clinical research examined how the patch’s contraceptive outcomes might vary among women with different Body Mass Index (BMI) measurements. The data show patterns related to contraceptive outcomes that differed across BMI categories that were evaluated in the study population. The reported measurement of contraceptive outcomes was observed in some studies to be lower in women with higher BMI. The reported Pearl Index was observed in the study to be higher for women whose BMI was mathbf30 kg/m^2 or greater compared to women with a BMI lower than 30 kg/m^2. This specific finding was associated with the resulting limitation of the studied population.


Pharmacokinetic Studies and Hormone Exposure

Dedicated pharmacokinetic (PK) studies research examined the way the body handles the active ingredients, Levonorgestrel and Ethinylestradiol. These studies were evaluated in healthy women to understand the total systemic exposure. The findings indicate that the Twirla patch was studied for delivering a dose of Ethinylestradiol that results in lower systemic exposure compared to the older, higher-dose contraceptive patch. This difference in hormone exposure was observed in the PK studies, and the reported measurements are associated with levels that may be comparable to those found with some low-dose birth control pills.

Frequently Asked Questions (FAQ)

Common questions about Twirla (FAQ)


Q: How is Twirla different from other contraceptive patches?

A: Twirla is classified as a combined hormonal patch, utilizing the synthetic hormones Levonorgestrel and Ethinyl Estradiol. A key distinction, noted in the official prescribing information, is that Twirla delivers a lower daily dose of Ethinyl Estradiol (estrogen component) compared to certain other transdermal contraceptive systems that have been established for longer periods.


Q: Does Twirla change the timing or heaviness of a period?

A: Official information indicates that women using the patch may experience changes to their menstrual patterns, which can include unscheduled bleeding or spotting outside of the scheduled patch-free week. Additionally, painful periods, known as dysmenorrhea, were reported as a common adverse reaction during clinical studies for the product.


Q: Will I have a period every month while using Twirla?

A: The Twirla regimen is structured to allow for withdrawal bleeding (similar to a period) during the patch-free week each month. However, official labeling notes that some users may experience amenorrhea, which is the complete absence of scheduled bleeding. If scheduled bleeding is missed, the possibility of pregnancy may need to be assessed.


Q: How does the patch stick if I shower or swim often?

A: Patient instructions advise checking the patch every day to ensure it is firmly in place. This includes checking the patch after water exposure, such as bathing, showering, or swimming. The manufacturer describes the patch as having features designed for sustained adhesion. Users are advised to check the patch daily to ensure it remains fully attached, especially after water exposure.


Q: What should I do if my Twirla patch falls off before the change day?

A: Regulatory instructions describe the steps to follow if the patch begins to lift or falls off, which includes attempting to put it back on immediately. If the original patch will not stick, a new patch should be applied right away. If the patch has been off for 24 hours or more during an active week, a new 4-week cycle must be initiated, and a non-hormonal backup method is required for the first seven days of the new cycle.


Q: What happens if I forget to change my Twirla patch exactly on time?

A: If the delay in changing the patch in the middle of a cycle (Active Week 2 or 3) is less than 48 hours, a new patch should be applied immediately, and the schedule can revert to the original Patch Change Day. However, if the delay is 48 hours or more, a new 4-week cycle must be started, and a backup contraceptive method must be used for the next seven days of use.


Q: How long does it usually take for Twirla to start working?

A: The onset of contraceptive protection depends on when the patch is started relative to the menstrual cycle. If the first patch is applied within the first 24 hours of the start of a menstrual period, contraceptive protection is generally established immediately. If the patch is started at any other time, a non-hormonal backup contraceptive method must be used for the first seven days of the initial cycle.


Q: Does Twirla cause changes in mood in some users?

A: While not always listed among the most common adverse reactions, official documentation recognizes that combined hormonal contraceptives may be associated with mood changes. These can include mood swings, depression, or emotional lability.


Q: If I stop using Twirla, how long until my cycle returns to normal?

A: Following the discontinuation of combined hormonal contraceptives, official guidance indicates that the return to a regular menstrual cycle and typical reproductive function is generally expected to occur quickly after the hormones have cleared the system.


Q: What kind of research evidence supports the use of Twirla?

A: The approval for Twirla is supported by evidence from a large Phase 3 clinical trial known as the SECURE study, where participants were observed for one year. The official regulatory data reported an overall Pearl Index of 5.8 (with a 95% Confidence Interval of 4.5–7.2), which is a calculation used by researchers to measure the rate of pregnancy per 100 women using the method for a year.


Q: Are the hormone levels from Twirla stable throughout the week?

A: The Twirla transdermal system is specifically engineered to provide a continuous, stable daily nominal dose of Levonorgestrel and Ethinyl Estradiol. Pharmacokinetic studies examined the way the body handles the medicine to ensure systemic hormone exposure over the full seven days of wear.


Q: What are the typical instructions for stopping Twirla use?

A: Official documentation specifies that the patch must be discontinued well in advance of major surgery or prolonged immobilization. For elective stopping, if pregnancy is to be avoided, a non-hormonal backup contraceptive method must be immediately implemented upon discontinuation, and consulting a healthcare provider is generally advised.


Q: Can I get pregnant if the patch is off for a short time?

A: Official regulatory instructions indicate that if a patch is off for less than 24 hours, the user should put it back on or replace it with a new patch, and no backup contraception is required. Protection is considered reduced if the patch is off for longer periods than this, as described in the instructions for missed dosing.


Q: What is the difference between Twirla and Xulane?

A: Twirla and Xulane are both transdermal contraceptive patches, but they contain different hormones and doses. Twirla contains Levonorgestrel and 30 mcg of Ethinyl Estradiol. Xulane contains Norelgestromin and 35 mcg of Ethinyl Estradiol. Twirla's 30 mcg of Ethinyl Estradiol is a lower dose than the 35 mcg found in Xulane.


Q: How is the hormone released from the Twirla patch?

A: Twirla functions as a transdermal system that utilizes an adhesive matrix containing the active ingredients. This system is designed to release its hormonal components—Levonorgestrel and Ethinyl Estradiol—continuously through the skin and directly into the bloodstream over the course of the one-week application period.


Q: Is it common to have spotting or breakthrough bleeding on Twirla?

A: Yes, unscheduled bleeding and spotting are common occurrences for women using the transdermal patch. Regulatory data indicates this is particularly frequent during the first few months of use, but it typically tends to lessen or resolve as the user continues on the prescribed schedule.


Q: Are the side effects of Twirla permanent?

A: While the regulatory information does not specifically address the term 'permanent,' side effects observed in clinical trials are generally considered transient and expected to resolve after the drug is discontinued. Official safety information recognizes that rare, serious adverse events, such as certain cardiovascular events, are associated with combined hormonal contraceptives.


Q: Does Twirla cause changes in appetite?

A: Weight gain was reported as a common adverse reaction in clinical trials for Twirla. Although changes in appetite are not listed as a separate frequent adverse event, this is a related topic. Official labeling provides detailed information on all recognized adverse effects.


Q: How is Twirla disposed of after use?

A: Official regulatory instructions require a specific disposal protocol for used patches. The patch must first be folded in half so that the adhesive sides stick together, neutralizing any remaining active medicine. The folded system must then be safely discarded in the trash. Disposal instructions prohibit flushing the used patch down the toilet.


Q: Is it possible to use Twirla while breastfeeding?

A: Official documentation advises that combined hormonal contraceptives, including the Twirla patch, may lead to a reduction in the quantity and quality of milk produced in women who are breastfeeding. Therefore, the patch is generally not recommended for use while breastfeeding, and an alternative method of contraception may be discussed.

How should Twirla be stored and disposed of?

Storage and Handling of Twirla

The Twirla transdermal system must be stored at controlled room temperature, specifically between 68 F and 77 F (20 C and 25 C). The official labeling strictly prohibits storing the patches in the refrigerator or freezer. To maintain stability and integrity, the patch must be kept in the original unopened pouch until the time of application.

Disposal Requirements

Official regulatory instructions define a specific protocol for disposal. Used Twirla patches must first be folded in half so the adhesive side sticks to itself. The folded system must then be discarded safely into the trash. It is explicitly stated that the used transdermal system must not be flushed down the toilet. Both unused and used patches must be stored and disposed of out of the reach of children and pets.

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

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