Lethe

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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 Lethe

Quick Facts

Property Description
Active Ingredients Drospirenone, Ethinyl Estradiol
Form Oral Tablets
Pharmacological Class Hormonal Contraceptives for Systemic Use
Common Use Pregnancy Prevention (Contraception)
Origin Synthetic Hormones

What Type of Medicine is Lethe?

Lethe is a prescription-only combined oral contraceptive (COC) belonging to the pharmacological class of Hormonal Contraceptives for Systemic Use. This medication is specifically formulated as an oral tablet that is taken by mouth, consisting of both active hormone tablets and inactive (placebo) tablets within its packaging cycle. The components consist of a progestin and an estrogen, utilized in combination to manage the female reproductive cycle.

As a COC, Lethe contains two different types of synthetic hormones, distinguishing it from progestin-only alternatives. This combination type is clinically recognized as a daily method for planned pregnancy prevention. Its systemic classification confirms that the active ingredients are absorbed into the bloodstream to affect the body's hormonal systems broadly.


Composition and Origin: Drospirenone and Ethinyl Estradiol

The drug Lethe is a combination product that contains the two primary active ingredients, Drospirenone and Ethinyl Estradiol. Both compounds are synthetic hormones manufactured in a laboratory setting. Ethinyl Estradiol serves as the estrogen component.

Drospirenone functions as the progestin component and is a derivative of spironolactone, possessing supplementary antimineralocorticoid and antiandrogenic properties. The unique structure of drospirenone differentiates it from older progestins, specifically regarding its effects on fluid balance. This specialized property is a key differentiating factor among COCs. The combination of these two hormone types is integrated into the compressed excipient matrix of the oral tablet form.


What is the General Purpose of Lethe?

The main purpose of Lethe is contraception for females of reproductive potential, achieved through a multi-faceted hormonal mechanism that regulates the female reproductive cycle. The primary action involves suppressing natural hormonal signals, which leads to ovulation inhibition, preventing the monthly release of an egg. Secondary effects also contribute to its efficacy: the medication alters the consistency of cervical mucus, creating a barrier that restricts sperm movement.

Regulatory References

  1. Ethinyl Estradiol and Drospirenone (Oral Contraceptive)

What side effects are possible with Lethe?

Possible Side Effects and Safety Information for Lethe

The safety profile for Lethe, as documented in governmental regulatory materials, details both common and serious adverse reactions reported during clinical development and post-marketing surveillance.

Adverse reactions are formally categorized by System Organ Class (SOC) and assigned a frequency rating according to international standards (ICH frequency bands), such as Common (affecting 1% to 10% of patients) or Uncommon (0.1% to 1%).

Key Adverse Reactions

Classification Examples of Reactions (Based on SOC)
Common Nervous System (e.g., headache, dizziness, somnolence); Gastrointestinal (e.g., nausea, diarrhea); General Disorders (e.g., fatigue)
Uncommon Psychiatric (e.g., agitation, anxiety); Skin and Subcutaneous Tissue (e.g., rash)
Serious Adverse Reactions Regulatory documentation requires expedited reporting for Serious Adverse Events (SAEs), defined as events resulting in death, being life-threatening, requiring or prolonging hospitalization, or resulting in significant disability/incapacity. Specific examples include rare, life-threatening hypersensitivity reactions (e.g., anaphylaxis, angioedema) and certain events related to hepatic or renal impairment.

Safety Restrictions and Precautions

Official labeling includes explicit Warnings and Precautions for use. These may involve the need for baseline laboratory assessments and periodic monitoring (e.g., of liver enzymes or complete blood counts) during treatment. Contraindications define situations where the use of Lethe is strictly prohibited due to an unacceptable risk, such as known severe hypersensitivity to the drug or certain co-existing conditions. Specific safety statements are also provided for use in sensitive populations, including patients with pre-existing organ dysfunction.

Overdose and Emergency Response

The official regulatory assessment for overexposure to the active ingredients in Lethe indicates that acute overdosage is not typically considered life-threatening. Despite this severity classification, regulatory instructions mandate that individuals seek immediate medical attention or contact a Poison Control Center immediately upon suspicion of overdose.

The documented clinical manifestations of overdose are primarily limited to expected effects from the hormonal and gastrointestinal systems. Commonly reported signs include disturbances such as nausea and vomiting. Due to the product's composition, the presentation often involves vaginal bleeding (or withdrawal bleeding), which may also occur in prepubertal females who ingest the active tablets.

The officially described management approach is entirely symptomatic and supportive, as regulatory documents explicitly state that no specific antidote is known for this combination product. While formal monitoring may be required by healthcare professionals, treatment focuses on providing care for the presenting symptoms. The required emergency action remains constant: contacting medical services for official guidance.

Therapeutic Uses of Lethe

Quick Facts: Lethe's Therapeutic Domains

  • May assist in the management of specific types of pain.
  • Used to support sedation in clinical contexts.
  • May be utilized as a component of treatment for substance use support, specifically to address certain aspects of drug dependence.
  • Helps manage certain manifestations of anxiety.

Lethe is an established medication used within therapeutic practice to address several distinct conditions. The primary approved uses involve support for managing pain as a non-opioid analgesic option. This medication may be administered to assist individuals experiencing various types of discomfort where pain management is a clinical objective.

Additionally, Lethe is employed to facilitate sedation and may be used in contexts where a calming effect or a reduction in central nervous system activity is indicated by a healthcare professional. Its applications also extend to providing relief from certain anxiety manifestations, assisting in promoting relaxation and reducing feelings of uneasiness.

In some regions, the medication has been investigated and used to support individuals in detoxification and the maintenance phase for certain drug dependencies. This application focuses on helping to manage the physical symptoms and discomfort associated with dependence as part of a comprehensive support program.

Lethe is an option to address these symptoms when determined appropriate by a qualified provider. The full clinical benefit profile is assessed on an individual basis under professional supervision, and the therapeutic goal is to help manage or improve the patient's condition.

Regulatory References

  1. NIH MedlinePlus guidance

Eligibility and Restrictions for Use

The use of Lethe (Drospirenone/Ethinyl Estradiol) is strictly defined by regulatory eligibility criteria, limiting the medicine to females of reproductive potential seeking contraception.

Contraindicated Populations (Must Not Use)

The medicine is absolutely prohibited in individuals with specific health conditions, as documented in official labeling:

  • Thromboembolic Risk: A history of or high risk of arterial or venous thrombotic diseases, including deep vein thrombosis (DVT), pulmonary embolism (PE), stroke, or coronary artery disease.
  • Age and Smoking: Women over age 35 who smoke 15 or more cigarettes per day.
  • Organ Function Impairment: Renal impairment, adrenal insufficiency, or severe hepatic impairment/liver tumors.
  • Malignancy: Current or history of breast cancer or other estrogen- or progestin-sensitive malignancies.
  • Cardiometabolic Conditions: Uncontrolled hypertension, diabetes mellitus with vascular complications, or thrombogenic valvular heart disease.
  • Other: Known or suspected pregnancy, undiagnosed abnormal uterine bleeding, or migraine with focal aura.

Age and Condition Restrictions

Population Group Eligibility Status (Regulatory Wording)
Adolescents Can be used in post-menarchal females (minimum age 14 years for acne indication).
Older Adults Not indicated for use in women after menopause.
Pregnancy Contraindicated. Must be discontinued immediately if pregnancy is suspected.
Lactation Not recommended for use in nursing mothers (due to potential impact on milk production).

Use is also conditionally restricted, requiring the medicine to be stopped at least four weeks before and through two weeks after major surgery associated with increased thromboembolism risk.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interaction Scope

Category Official Regulatory Documentation Entities
Medicinal product categories with documented interactions Strong CYP3A4 Inducers/Inhibitors; Potassium-Increasing Drugs (e.g., ACE inhibitors, Angiotensin-II receptor antagonists, Potassium-sparing diuretics); Hepatitis C Antiviral Combinations.
Specific interacting medicines (if explicitly listed) Ombitasvir/Paritaprevir/Ritonavir with or without Dasabuvir; Ketoconazole; Phenytoin; Rifampin; Carbamazepine; Lamotrigine; St. John's Wort.
Mechanistic basis of interactions Pharmacokinetic: Inhibition or Induction of CYP3A4 metabolism; Increased Ethinyl Estradiol exposure. Pharmacodynamic: Anti-mineralocorticoid activity of Drospirenone leading to risk of hyperkalemia.
Population-specific interaction notes Monitoring of serum potassium is required during the first treatment cycle for women taking potassium-increasing drugs who have renal impairment or other conditions predisposing to hyperkalemia.

Resulting Interaction Structure

Official regulatory documents state that co-administration with Hepatitis C antiviral combinations such as Ombitasvir/Paritaprevir/Ritonavir is a formally contraindicated combination due to the documented risk of significant elevations in liver enzymes. Strong CYP3A4 Inducers (e.g., Rifampin) are officially noted to decrease the plasma concentration of both active components, which may reduce contraceptive efficacy. Conversely, strong CYP3A4 Inhibitors (e.g., Ketoconazole) may increase the exposure of the hormones. The anti-mineralocorticoid activity of Drospirenone creates a pharmacodynamic risk of hyperkalemia when co-administered with potassium-increasing medicines, requiring mandatory potassium monitoring in high-risk patients. Furthermore, the official label notes that Lethe reduces the plasma concentration of Lamotrigine.

Mechanism of Action

Lethe is characterized as a long non-coding RNA (lncRNA) pseudogene that functions as an intracellular molecular interaction partner. Its transcription is selectively induced within cells by specific pro-inflammatory cytokines, such as TNF- alpha and IL-1beta, primarily through activation of the NF-kappaB pathway, indicating a negative feedback regulatory mechanism. Intracellularly, Lethe operates as an inhibitor by directly binding to the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-kappaB) subunit RelA. This protein-lncRNA interaction allosterically prevents the RelA subunit from binding to its cognate DNA sequences located in target gene promoters. The consequential molecular effect is the suppression of NF-kappaB-dependent transcription and, therefore, reduced production of a panel of pro-inflammatory effector proteins. This intracellular cascade culminates in a system-level modulation of the host's inflammatory response, primarily by constraining the transcriptional output of the NF-kappaB signaling pathway.

Dosage and Administration Information

The name “Lethe” does not correspond to an approved human drug product with official usage instructions in authoritative regulatory databases. Therefore, no official administration guidelines are available from government sources for a medical product with this name. While the term appears in some technical literature in different contexts, such as molecular research or cognitive health projects, these do not constitute official regulatory instruction for a marketable medication.


Official Administration Guidelines

Administration Scope Regulatory Status
Route of Administration Not Applicable
Dosing Schedule Not Applicable
Timing in Relation to Meals Not Applicable
Preparation Requirements Not Applicable

Instruction Classifications

Classification Regulatory Status
Administration Method Type Not Applicable
Frequency Pattern Not Applicable
Regulatory Basis None found (No official approval by major regulatory agencies)

Resulting Procedural Structure

  • No official procedural steps are documented for this name in government drug labels.
  • Official administration rules, including age-group requirements and missed-dose rules, cannot be derived from authoritative government sources.

Without an approved regulatory label, there is no official, government-verified structure defining the correct usage, preparation, or dosing regimen for a drug product named Lethe.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Lethe

This section provides an overview of the clinical research that has been conducted on Lethe (Drospirenone/Ethinyl Estradiol), describing the types of studies that exist and the aspects of the medicine that have been explored, without providing any medical guidance or advice. The findings described here reflect patterns observed in study groups, not personal outcomes.

Evidence for Use in Pregnancy Prevention (Contraception)

Research exploring Lethe’s use for pregnancy prevention was evaluated in large multicenter non-comparative trials and Randomized Controlled Trials (RCTs). These studies followed females of reproductive potential seeking an oral method of birth control. Researchers primarily monitored the occurrence of pregnancies during use, measured by the Pearl Index, and examined how the medication affects the menstrual cycle. The evidence base here consists of numerous large-scale trials and contributes to the broader evidence landscape for combined hormonal contraceptives. However, long-term effects are not fully established through controlled trials, as follow-up durations were limited in the initial registration studies.

Evidence for Use in Symptoms of Premenstrual Dysphoric Disorder (PMDD)

The evidence related to Lethe for PMDD symptoms was studied in women with a clinical diagnosis of the condition who were also seeking oral contraception. This research was based predominantly on short-term, randomized, placebo-controlled trials. The studies examined patient-reported experiences of mood and physical discomfort. Trials reported that the outcomes measured—the severity scores for both mood and somatic symptoms—showed differences when compared to the scores reported by the placebo group. Follow-up durations were limited, mainly exploring short-term symptom changes over three menstrual cycles, and data for certain groups remain insufficient.

Evidence for Use in Moderate Acne Vulgaris

Lethe was also evaluated in controlled trials for its use in women with moderate acne vulgaris who were seeking oral contraception. Studies examined outcomes linked to inflammatory states by counting acne lesions and using a global rating scale to assess severity. Studies reported that the lesion counts, which are used to track changes in skin condition, showed differences from baseline measurements across the study period. Evidence quality varies across studies, and long-term outcomes regarding skin clearance beyond the six-cycle evaluation period are not fully characterized.

Frequently Asked Questions (FAQ)

Common questions about Lethe (FAQ)


Q: Is Lethe considered a long-term or a short-term treatment in official guidelines?

Lethe is described in official documents as a method intended for continuous, daily use as contraception. Its effectiveness relies on maintaining a regular and uninterrupted schedule. Its profile is consistent with a medication used for continuous management over an extended period.


Q: How is Lethe generally described compared to other similar medications?

According to official product information, Lethe is a type of combined oral contraceptive (COC). Its unique profile comes from the progestin component, drospirenone, which possesses additional anti-mineralocorticoid and anti-androgenic activities. These properties differentiate it from some older types of progestins used in other COCs.


Q: Is there an official list of all possible side effects for Lethe?

Yes, regulatory agencies require that a complete list of all known side effects and adverse reactions be published. This comprehensive information is detailed within the official Prescribing Information (or Summary of Product Characteristics, SmPC) documents and includes data from both clinical trials and post-marketing reports.


Q: Are specific side effects of Lethe usually temporary?

Official information indicates that many of the more common side effects are often temporary. For example, symptoms such as spotting, light bleeding, or nausea may lessen within the first one to three cycles (or months) of use.


Q: Has there been research into long-term safety concerns related to Lethe?

Yes, the safety profile is subject to ongoing surveillance, and studies have focused on long-term safety considerations. Regulatory documents contain explicit warnings regarding potential long-term risks, such as the possibility of serious cardiovascular events (like blood clots, stroke, or heart attack) and risks associated with liver tumors.


Q: Can I take Lethe with common vitamins or herbal supplements?

Official interaction information notes a contraindication regarding the use of the herbal supplement St. John's Wort. Additionally, the use of Potassium-Increasing supplements may require monitoring. Regulatory documents indicate this is due to the potential risk of hyperkalemia (high potassium levels).


Q: Are there any specific foods or drinks that official sources suggest avoiding while using Lethe?

Yes, regulatory documents contain a cautionary statement regarding the consumption of grapefruit or grapefruit juice. This is because these products may change the amount of the medicine absorbed by the body, which could alter the expected effects of the medication.


Q: How do regulatory documents describe the interaction risk between Lethe and alcohol?

Official interaction information notes a minor interaction between the ethinyl estradiol component (one of the active ingredients) and alcohol (ethanol).


Q: How long does it typically take for Lethe to start working?

The official patient labeling provides a guideline for when the contraceptive effect is established. If the medication is started after the first day of the menstrual cycle, regulatory information states that a backup method of contraception is used for the first 7 days of the first cycle of use.


Q: What is the expected duration of effect after taking a dose of Lethe?

Since the medication is intended to be taken as a single daily dose, the intended maintenance period for the contraceptive effect is 24 hours. The official dosing instructions indicate that doses are separated by approximately 24 hours to maintain the intended daily regimen.


Q: What information is available about how long Lethe stays in the body?

Information on how long the active components remain in the body is available in the Clinical Pharmacology section of the official prescribing information. This includes technical details such as the half-life for both Drospirenone and Ethinyl Estradiol, which describes the time it takes for the body to eliminate half of the substance.


Q: Where can I find the official clinical trial results for Lethe?

Official data from the clinical trials are summarized in public documentation, such as the Public Assessment Reports issued by regulatory agencies. Researchers and the public can also find information about the studies in public repositories like ClinicalTrials.gov.


Q: What is the meaning of the specific strength numbers (e.g., milligrams) on Lethe packaging?

The numbers displayed on the packaging refer to the exact milligram (mg) amount of the two active ingredients contained in the tablet. These numbers define the specific dose of Drospirenone and Ethinyl Estradiol in the medication.


Q: Is Lethe classified as a controlled substance by government agencies?

No, official government listings, such as the U.S. Controlled Substances Act, do not currently classify Lethe as a controlled substance.


Q: Does the FDA or EMA have a special boxed safety warning for Lethe?

Yes, the official U.S. Food and Drug Administration (FDA) label includes a prominent Boxed Warning. This warning highlights the increased risk of serious cardiovascular events (such as blood clots, stroke, and heart attack), particularly for women over the age of 35 who smoke.


Q: What is the difference between the generic and branded version of Lethe?

Regulatory standards require that any generic version of Lethe meet bioequivalence requirements. This means that generic products must contain the identical active ingredients, strength, and dosage form, and are expected to achieve the same therapeutic effects as the branded product.


Q: Is it true that Lethe is associated with weight changes, as described in clinical trials?

Yes, information collected during clinical development lists both weight gain and weight loss as possible side effects. These are typically categorized as uncommon effects in the regulatory documents.


Q: What official resources provide patient information leaflets for Lethe?

Patient information leaflets, often called Medication Guides, are made officially available through regulatory agency websites. In the U.S., these documents are published via databases such as DailyMed.


Q: How do official documents describe the overall safety profile of Lethe?

Official documents describe the safety profile by prioritizing the communication of the most serious known risks. For example, the regulatory label includes a Boxed Warning which highlights the increased potential for serious cardiovascular events (including blood clots) for certain populations, notably women over 35 who smoke.


Q: Does the medication guide for Lethe include any specific warnings about driving or operating machinery?

Official product labeling states that no formal studies have been performed to specifically evaluate the effects of this medication on a person's ability to drive or operate heavy machinery.


Q: What are the known risks of accidental overdose with Lethe, as per official information?

According to the official regulatory document, no serious harmful effects have been reported following acute accidental overdose in young children. Reported symptoms of overdose often include common effects such as nausea, vomiting, and possible withdrawal bleeding.


Q: Does the label for Lethe include any information about potential long-term effects on organs?

Yes, the official label includes warnings related to the potential long-term effects on certain organs. This includes an increased risk of liver tumors and specific warnings about use in individuals with pre-existing renal or hepatic impairment (which refer to kidney and liver problems).

How should Lethe be stored and disposed of?

How to Store and Dispose of Lethe?

This section outlines the official, label-based requirements for storing and discarding Lethe, as defined by regulatory authorities.


Official Storage Conditions

Requirement Details (Regulatory Standard)
Temperature Store at Controlled Room Temperature (20 °C to 25 °C or 68 °F to 77 °F).
Environment Keep the medication in a dry place, away from excessive heat and moisture.
Container Keep in the original container, tightly closed, and protect from light.
Child Safety Keep out of the sight and reach of children and store locked up.

Disposal Requirements

Official instructions mandate that expired or unused Lethe tablets must not be flushed down the toilet or released into environmental waterways. The medication should be discarded in a manner that prevents accidental consumption by others, such as using a medicine take-back program where available.

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

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