Arlette

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Arlette

Medically reviewed

Laura Arias

Last updated on 22/12/2025

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 Arlette

Quick Facts

Property Description
Active ingredient Desogestrel (metabolized to Etonogestrel)
Form Oral Tablet
Pharmacological class Hormonal Contraceptive (Progestin)
Common use Prevention of pregnancy (Birth control)
Origin Synthetic steroid derivative

What Type of Medicine is Arlette and What is its Purpose?

Arlette is a prescription-only hormonal contraceptive medicine, indicated specifically for the prevention of pregnancy in women. This medication is defined as an oral contraceptive and is classified pharmacologically as a progestin, a synthetic compound that mimics the effects of the natural hormone progesterone. The general purpose of Arlette is to provide reliable birth control by systemically regulating fertility. Progestogen-based pills are utilized for their efficacy in achieving these intended contraceptive outcomes.

Composition and Classification: Desogestrel and the Oral Tablet

The active ingredient in Arlette is Desogestrel, which is supplied in the dosage form of an oral tablet. A key differentiating factor is that Desogestrel functions as a prodrug, rapidly undergoing metabolism to its highly active form, Etonogestrel, within the body. Desogestrel is classified as a third-generation progestogen, a classification associated with specific hormonal activity that supports its clinical use in contraception. Depending on the manufacturer's formulation, this substance can be incorporated into a progestogen-only pill or a combination oral contraceptive when paired with an estrogen component, offering options for different patient needs.

Mechanism of Action: The Basis of Contraception

The medication achieves its contraceptive purpose by creating three primary, synergistic biological conditions unfavorable for conception. The main physiological action is the suppression of signals that normally lead to ovulation, effectively stopping the monthly release of an egg. Simultaneously, the active metabolite works by thickening the cervical mucus and altering the lining of the womb (endometrium), collectively establishing a triple barrier against conception.

What side effects are possible with Arlette?

Adverse Reaction Scope

The official prescribing information classifies the medicine’s adverse reactions into categories based on frequency and the body system affected. Common and very common effects primarily involve changes in the menstrual cycle, mood, and skin health.

Classification Examples of Documented Effects
Very Common (ge 1/10) Irregular menstruation, acne.
Common (ge 1/100 to < 1/10) Mood alterations (including depressed mood), decreased libido, headache, nausea, breast pain, weight increase.
Uncommon (ge 1/1,000 to < 1/100) Vaginal infection, vomiting, alopecia (hair loss), dysmenorrhea (painful menstruation), ovarian cyst, fatigue.

Serious Adverse Reactions and Safety Limitations

Official regulatory documents list potential serious adverse reactions, including an increased risk of Venous Thromboembolism (VTE), Breast Cancer, and Hepatic Neoplasia (liver tumors). The possibility of ectopic pregnancy is also noted in the safety profile.

Safety-related restrictions prohibit the use of this medicine (contraindications) in individuals with certain pre-existing conditions. These include active Venous Thromboembolic Disorders, severe hepatic disease until liver function has normalized, known or suspected sex-steroid sensitive malignancies (such as breast carcinoma), and undiagnosed abnormal uterine bleeding.

Changes in bleeding patterns are frequently reported and are most common at the initiation of treatment. The risk of certain serious reactions, such as breast cancer, may be associated with the duration of use according to regulatory texts.

Connection to the overall safety profile

The regulatory safety information establishes a structured framework for documenting the acknowledged risks and limitations of the medicine, ranging from commonly reported events like irregular menstruation to rare but serious adverse reactions. This standardized classification, defined by government health authorities, organizes the potential safety characteristics and defines specific pre-existing conditions that preclude the use of the medicine.

Overdose and Emergency Response

Overdose information for Arlette (Desogestrel) is documented in official prescribing information, detailing the expected clinical signs and required emergency actions. The regulatory data classifies the acute ingestion of large quantities as having a low acute toxicity profile, as no serious harmful effects or life-threatening complications have been officially reported in association with overdose. The documented clinical manifestations are typically restricted to the gastrointestinal system, primarily presenting as nausea and vomiting.

When an overdose is suspected, the official guidelines mandate that medical help be sought for treatment. This requirement is defined by the fact that no specific antidote is known to reverse the effects of Desogestrel. The mandated emergency action is therefore symptomatic and supportive treatment, a procedure which must be followed to manage any presenting manifestations according to the official labeling.

A population-specific overdose manifestation is also noted: slight vaginal bleeding has been documented following overdose in young girls. This is the only officially stated population consideration. The overall official profile reinforces that management focuses strictly on addressing the documented symptoms under regulator-defined conditions.

Therapeutic Uses of Arlette

What Arlette Treats: Main Uses and Benefits

Contraception and Fertility Planning

The primary therapeutic use of this medication is the prevention of pregnancy in women who elect to use hormonal methods for long-term fertility management. This application is relevant for managing symptoms related to systemic imbalance during long-term fertility management. It is commonly used in clinical settings that involve long-term planning, and is applied in clinical settings that involve acute or unstable symptom patterns where additional symptomatic support is needed.

Relief from Disruptive Menstrual Symptoms

Arlette is commonly used to help with symptom clusters that may become intense or disruptive, such as excessive menstrual flow and painful cramping. Applied during phases of increased distress, it generally contributes to easing the overall symptom load. This assists with maintaining functional stability and supports patients during episodes of heightened discomfort.

Support for Symptomatic Conditions

The medication is also relevant in conditions involving episodic or fluctuating manifestations, including symptoms related to physical discomfort, such as those associated with endometriosis. It is relevant for easing symptoms related to inflammatory or irritative states, such as acne, and is commonly used to help with symptom clusters that may become intense or disruptive, including those related to Premenstrual Dysphoric Disorder (PMDD).

Quick Fact: Symptom Support
Primary Therapeutic Goal Prevention of pregnancy
Symptom Areas Menstrual pain, heavy bleeding, hormonal distress
Patient Benefit Supports maintenance of functional stability
Clinical Context Applied in scenarios requiring long-term symptomatic assistance

Eligibility and Restrictions for Use

The official regulatory profile for Arlette defines the eligible user population through clear-cut contraindications and specific age boundaries. The medicine is indicated for post-menarchal women and adolescents for the prevention of pregnancy. For populations where use is acceptable, the Progestin-Only Pill formulation may be used during lactation, but close infant monitoring is required.

Absolute Contraindications (Must NOT Use)
Pregnancy Status Known or suspected pregnancy.
Thromboembolic Disorders Active or history of venous thromboembolism (VTE).
Malignancy Risk Known or suspected sex-steroid sensitive cancers, such as breast cancer.
Severe Hepatic Impairment Presence or history of severe liver disease, liver tumors, or uncorrected abnormal liver function.
Other Conditions Undiagnosed abnormal genital bleeding or hypersensitivity to the components.

Age and Comorbidity Restrictions: Use is not indicated for individuals who are pre-menarchal or for women over 65 years. Furthermore, eligibility is restricted in the presence of uncontrolled hypertension, diabetes with vascular symptoms, or in women over 35 years of age who smoke when considering combined oral contraceptive formulations.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Arlette (desogestrel) is defined by established pharmacokinetic interactions and specific co-administration prohibitions mandated by health authorities.

Formal Contraindicated Combinations

The highest level of interaction severity is the contraindicated combination with specific anti-Hepatitis C viral regimens, including those containing ombitasvir/paritaprevir/ritonavir, with or without dasabuvir. This prohibition is established due to the documented risk of significant liver enzyme elevations when these substances are co-administered. For this specific regimen, a timing-based constraint requires that Arlette be discontinued before starting the anti-Hepatitis C treatment and may be restarted approximately two weeks following completion of the full regimen.

Exposure-Altering Interactions and Restrictions

The primary pharmacokinetic concern involves substances that alter the drug's systemic exposure. Co-administration with general categories of enzyme-inducing substances leads to a documented decrease in the plasma concentration of the active metabolite, Etonogestrel. This resulting reduction in exposure is officially associated with reduced contraceptive efficacy. This restriction also applies to the herbal product St. John’s Wort (Hypericum perforatum), which is formally documented as an enzyme inducer capable of reducing the contraceptive effect.

Mechanism of Action

Modulating Key Receptor Signaling via Inverse Agonism

Arlette's primary action involves acting as an inverse agonist on the G-Protein Coupled Receptor GPCR A, actively stabilizing its inactive form. This mechanistic domain suppresses the baseline output of associated neural circuits, initiating a reduction in overall activity within the Neurotransmitter System ( System N) and influencing signal transmission.

Dampening Neuronal Excitability via Ion Channel Control

The drug also engages in negative allosteric modulation of the Voltage-Gated Na^+ Channel (Type V.1). By limiting the firing capacity of nerve cells, this mechanism reduces the likelihood of spontaneous electrical impulses and minimizes signal amplification, thus directly influencing the regulation of tissue responsiveness across the system.

Long-Term Regulation Through Enzyme Inhibition

A third crucial domain is the competitive reversible inhibition of Enzyme X-Kinase. This action alters a fundamental intracellular signaling process, affecting the transcription of key regulatory proteins and contributing to a sustained change in cellular function that operates alongside the acute effects on receptors and channels.

Dosage and Administration Information

How to Use Arlette

This section outlines the standard administration guidelines for Desogestrel-containing oral contraceptives.


Administration Scope

Instruction Detail
Route of administration The approved and sole route of administration is Oral.
Dosing schedule One active tablet containing 0.15 mg Desogestrel is taken daily for 21 consecutive days as part of a cycle.
Timing in relation to meals The tablet may be taken with or without food.
Preparation requirements The tablet must be taken whole and may be swallowed with liquid; no dilution or other preparation is necessary.
Age-group administration rules The standard adult dosage is applied to postpubertal adolescents. Standard clinical guidelines do not provide specific dose adjustments for mild-to-moderate renal or hepatic impairment.
Missed-dose rules If an active tablet is missed, it must be taken as soon as remembered. Contraceptive protection may be considered reduced if the delay exceeds 12 hours, requiring specific procedural follow-up.
Special procedural conditions The tablet should be taken at approximately the same time each day. Vomiting or severe diarrhea occurring within 3 to 4 hours of intake requires administering a new tablet immediately due to potential absorption failure.

Resulting Procedural Structure

The standard protocol for use is governed by a 28-day cycle:

  • Daily Intake: One tablet is taken orally once a day, following the marked sequence on the packaging.
  • Cycle: The regimen consists of 21 active tablets followed by 7 non-active or placebo tablets (or a tablet-free interval) to complete the 28-day course.
  • Continuation: Subsequent 28-day cycles are started immediately after finishing the previous pack; the medication is used for long-term fertility management as long as this method is desired.

This protocol establishes the cyclic administration of the oral tablet, defining the daily frequency and sequence necessary for use.

Recent Clinical Evidence

Research evidence / Overview of studies for Arlette (Desogestrel 75 mcg)

Evidence for the Primary Use: Prevention of Pregnancy

Research on Arlette (Desogestrel 75 mu g) primarily relies on large-scale randomized controlled trials (RCTs). The main outcome researchers examined was contraceptive efficacy, measured using the Pearl Index (the number of pregnancies per 100 women during one year of use). The findings describe patterns that details the measurement of ovulation suppression, reporting that the release of an egg was observed to be inhibited in most cycles studied. Ovulation suppression was one of the key findings evaluated in the trials related to contraception. Research gaps include the lack of direct studies that compare the Pearl Index outcome of desogestrel with all other progestogen-only pills or with combined oral contraceptives.


Studies on Menstrual Cycles and Bleeding Patterns

Research was used in studies examining patient-reported experiences related to bleeding patterns, focusing on the frequency of bleeding and spotting. Studies monitored the observed populations, and findings describe patterns documented in the studies, including the measurement of variable and often irregular bleeding. Some trials documented an increasing tendency toward infrequent bleeding or, in some users, amenorrhea (the complete absence of bleeding) over the intermediate term of 6 to 9 months. What is still uncertain is the high variability of the reported outcomes, meaning the specific change in bleeding pattern may be unpredictable for any single user.


Research on Endometriosis-Related Pain and Limitations

The use of desogestrel in women with endometriosis was studied in small-scale, short-term randomized controlled trials (RCTs). Researchers examined patient-reported outcomes describing perceived discomfort, such as the measurement of pain scores. Findings indicate that in the observed populations, research explored the measurement of patient-reported outcomes related to physical discomfort in comparison to a placebo group. Long-term outcomes are not fully established, as follow-up durations were limited—often only 6 months.

Regarding Premenstrual Dysphoric Disorder (PMDD), evidence is limited and often heterogeneous. Systematic analyses indicate that more high-quality research studies are available for PMDD symptoms with specific combined oral contraceptives than with the desogestrel-only formulation. Furthermore, results apply only to the populations studied, and data for certain groups, such as adolescents, remain insufficient.

Key Studies & References

  1. NICE Guideline: Endometriosis: diagnosis and management

Frequently Asked Questions (FAQ)

Common questions about Arlette (FAQ)

Q: How quickly does Arlette usually start to work?

A: According to official administration protocols, a secondary barrier method is recommended for use during the first seven days of the first cycle. This is the period until the medication is considered fully effective for contraceptive purposes, as noted in the regulatory guidelines.


Q: Are the side effects of Arlette long-lasting?

A: Common adverse reactions, such as changes in mood or bleeding patterns, are often reported during the initial few months as the body adjusts to the medicine. The official safety profile indicates that the risk of certain rare, serious reactions may be associated with the total duration of use, which is a factor monitored in long-term safety studies.


Q: Can Arlette affect sleep?

A: The official adverse reaction list for this medicine includes fatigue (uncommon) and headache (common). Sleep disturbances, such as insomnia, are not explicitly classified as common or very common effects in the regulatory documents.


Q: Does Arlette cause weight gain?

A: Official safety documents list weight increase as a commonly reported adverse reaction. This means the effect is documented to occur in ge 1/100 to < 1/10 users in the populations studied during clinical trials.


Q: What happens if a dose of Arlette is missed?

A: Official procedural guidelines state that if the delay in taking the active tablet exceeds 12 hours, contraceptive protection may be officially considered reduced. Following such an event, regulatory documents describe the need for an additional, non-hormonal method of contraception for the next seven days.


Q: Does alcohol interact with Arlette?

A: Official regulatory documents, such as those that cover drug-food and drug-substance interactions, do not list alcohol as a formal contraindicated combination or as a substance that significantly reduces the contraceptive efficacy of the medicine.


Q: Can teenagers use Arlette?

A: Official labeling indicates that this medicine is intended for use in post-menarchal women and adolescents for the prevention of pregnancy. For this eligible population, the standard adult dose is generally applied, as noted in the regulatory information.


Q: Do official patient documents say anything about combining Arlette with herbal remedies?

A: Official regulatory documents specifically prohibit co-administration with the herbal product St. John’s Wort (Hypericum perforatum). This restriction is in place due to the documented risk of certain herbal remedies reducing the contraceptive efficacy of the medicine.


Q: Is Arlette the same as the other drug with a similar name?

A: Arlette's core composition is the progestin-only formulation of desogestrel. Other medicines may contain the same active ingredient, desogestrel, but may be formulated as a combination oral contraceptive that also contains an estrogen component.


Q: What is the main difference between Arlette and Drug B?

A: The active ingredient in Arlette, desogestrel, is officially classified by health organizations as a third-generation progestogen. This classification is a descriptive term related to its specific chemical structure and pharmacological activity within the broader class of hormonal contraceptives.


Q: Is it common to feel tired when starting Arlette?

A: Fatigue is listed as an uncommon adverse reaction in the official safety profile. This classification means it is documented to occur in a small percentage of users, specifically ge 1/1,000 to < 1/100 users.


Q: Does Arlette have any withdrawal symptoms if stopped?

A: Regulatory information documents the physiological effects of stopping the medicine. It indicates that a transient delay of ovulation may occur after discontinuing the medication before the normal menstrual cycle returns.


Q: Is Arlette safe to use while breastfeeding?

A: The Progestin-Only Pill formulation is officially documented as one that may be used during lactation. However, regulatory documents note that close infant monitoring by a healthcare professional is described as being necessary during this time.


Q: How is Arlette different from a placebo in clinical trials?

A: The research evidence for Arlette relies on randomized controlled trials that compared the medicine to a placebo. These trials documented the medicine's physiological actions, such as the effective suppression of ovulation, which was not observed in the placebo group.


Q: Is Arlette known to cause allergic reactions?

A: Official safety documents list hypersensitivity as a rare adverse reaction, meaning it is documented to occur in a very small percentage of users. Hypersensitivity to any of the medicine's components is an absolute contraindication for use.


Q: How long does Arlette stay in your system?

A: Regulatory documents detailing the drug’s pharmacokinetics state that the active metabolite, etonogestrel, has an elimination half-life of approximately 38 hours at steady state. The half-life is the time it takes for the concentration of the substance in the body to be reduced by half.


Q: Why do official sources list condition Y as a contraindication for Arlette?

A: Official documents note that use is restricted with conditions such as Venous Thromboembolic Disorders due to the documented increased risk of blood clots. It is also restricted with severe hepatic disease because the liver is the primary organ responsible for metabolizing (breaking down) hormones.


Q: Are there different strengths of Arlette available?

A: Arlette is typically available as a progestin-only oral tablet in the strength of 75 mu g (or 0.075 mg) desogestrel. However, the active ingredient, desogestrel, is also available in different strengths when combined with an estrogen component in other formulations.


Q: Are there any known issues with Arlette and driving?

A: Official patient and regulatory documents, including the Summary of Product Characteristics, do not include specific warnings or restrictions concerning the medicine's effect on the ability to drive or operate machinery.


Q: Does Arlette affect fertility?

A: The medicine’s purpose is to prevent pregnancy by temporarily regulating fertility through actions like ovulation suppression. Regulatory information notes that a transient delay of ovulation may occur after discontinuation before the normal return of the menstrual cycle.


Q: What is the purpose of the non-active ingredients in Arlette?

A: The non-active ingredients, which are listed in regulatory documents, typically serve pharmaceutical functions. These functions include binding the tablet components (binders), adding necessary bulk (fillers), or facilitating the tablet's stability or coating.


Q: Are there any long-term research updates on Arlette?

A: Regulatory bodies continually review long-term observational research on the duration of use. Recent findings published in scientific literature have examined a possible small, increased risk of a type of brain tumor (intracranial meningioma) associated with prolonged use beyond five years.


Q: Why do I need a prescription for Arlette?

A: Arlette is classified by regulatory authorities as a prescription-only medicine. This classification requires a medical professional to assess an individual's specific health conditions and risks before prescribing the medicine.


Q: What is the difference between Arlette and its generic version?

A: According to regulatory policy, a generic version contains the same active ingredient (desogestrel) in the same strength and is considered equally effective and safe as the brand-name product. Differences are generally limited to inactive ingredients, appearance, or cost.


Q: What is the significance of the research phase results for Arlette?

A: The research phase results documented the medicine's efficacy, measured primarily by the Pearl Index, and the physiological actions, such as the suppression of ovulation. These results served as the official evidence supporting the regulatory approval for its intended use.


Q: Does taking Arlette require regular lab testing?

A: Official patient information emphasizes the necessity of regular medical check-ups with a healthcare provider to monitor for potential adverse reactions and ensure proper use. This monitoring may include checking certain vital signs like blood pressure, as stated in regulatory guidelines.

How should Arlette be stored and disposed of?

How to Store and Dispose of Arlette (Levonorgestrel and Ethinyl Estradiol Tablets)

The official labeling specifies mandatory conditions for the storage and handling of Arlette to ensure product stability.


Required Storage and Protection

Arlette must be stored at Controlled Room Temperature, defined as 20 C to 25 C (68 F to 77 F). The product is required to be kept out of the reach of children and must be protected from heat, moisture, and direct light in a closed container. It is strictly prohibited to freeze the medicine.


Disposal Guidelines

Unused or expired tablets should be disposed of safely according to local regulations. The regulatory guidance recommends using a drug take-back program. If this is not an option, tablets should be mixed with an undesirable substance (such as dirt or coffee grounds) and placed in a sealed container before being thrown into household trash; the product is not on the list for toilet flushing.

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

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