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Seasonale

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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.

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Overview of Seasonale

Quick Facts

Property Description
Active Ingredients Ethinyl Estradiol, Levonorgestrel
Form Oral Tablets (Film-Coated)
Pharmacological Class Combined Oral Contraceptives (COCs)
Common Use Effective Pregnancy Prevention
Type/Regimen Extended-Cycle (91-day course)

What Type of Drug is Seasonale?

Seasonale is a prescription-only combination hormone medication that combines two synthetic active ingredients: Ethinyl Estradiol (a synthetic estrogen) and Levonorgestrel (a synthetic progestogen). It is formally classified as a Combined Oral Contraceptive (COC) within the pharmaceutical group of Estrogens/Progestins, a classification clinically recognized as providing dual hormonal support for comprehensive reproductive regulation. This specific combination formulation is also available under alternative trade names, such as Jolessa and Introvale.

Composition and the Extended-Cycle Form

Seasonale belongs to a distinct category of oral contraception defined by its extended-cycle administration regimen. The active tablets contain a consistent, fixed dose (monophasic compound) of both hormones, delivered as oral film-coated tablets, and are designed for a continuous course lasting 84 consecutive days. Pharmacological studies confirm that this continuous dosing method provides constant systemic hormone levels, which is aimed at managing the frequency of scheduled hormone withdrawal. This formulation is recognized for providing a unique cycle management approach, which is its primary differentiator in the contraceptive market.

General Purpose and Benefit of the Regimen

The primary purpose of Seasonale is to provide effective pregnancy prevention for women of reproductive potential. The combined hormonal action works synergistically through established biological pathways to ensure the reproductive system is not conducive to conception. The key benefit of the extended-cycle schedule is the programmatic reduction in the number of annual hormone withdrawal bleeding episodes. By following the 84-day active course, users experience scheduled bleeding only during the annual four 7-day hormone-free intervals, a benefit frequently sought by women aiming to minimize the impact of menstrual cycles on daily life.

Regulatory References

  1. Ethinyl Estradiol and Levonorgestrel Oral Contraceptives - MedlinePlus
  2. Oral Contraceptive Pills - StatPearls - NCBI Bookshelf
  3. Menstrual Suppression - StatPearls - NCBI Bookshelf
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What side effects are possible with Seasonale?

Possible Side Effects and Safety Information

The safety profile for Seasonale (levonorgestrel and ethinyl estradiol) is primarily structured around officially documented adverse reactions and specific regulatory limitations. The most common effects are generally reported during clinical use and initial treatment phases, while the most serious risks involve rare but significant vascular events.


Frequency-Classified Adverse Reactions

Adverse reactions are formally categorized based on their reported frequency in regulatory documentation:

  • Very Common / Most Common: Headache, Nausea, Irregular or heavy uterine bleeding, Breast tenderness or pain, Dysmenorrhea (painful periods).
  • Common: Migraine, Dizziness, Increased weight, Depression, Abdominal pain, Acne, Fluid retention.
  • Rare: Venous Thromboembolism (VTE), Arterial Thromboembolism (ATE), and Hepatic Adenomas (liver tumors).

Serious and Population-Specific Safety Statements

The most serious documented safety concerns are Thromboembolic Events (including deep vein thrombosis, pulmonary embolism, myocardial infarction, and stroke), which are emphasized in official labeling. The risk of these serious events is significantly elevated in specific populations, particularly women over 35 who smoke.

Time-related patterns note that irregular uterine bleeding is most common during the initial months of the extended-cycle therapy, and the overall risk of blood clots is highest during the first year of use. Use is formally contraindicated in individuals with a history of or current thromboembolic disease, active liver disease, or known estrogen-sensitive cancers.

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Overdose and Emergency Response

Overdose of Seasonale (Ethinyl Estradiol and Levonorgestrel) is classified by regulatory authorities as generally not likely to be life-threatening. This classification is based on official reporting which notes that no serious outcomes have been reported, even following accidental ingestion by children.

The documented clinical manifestations of overdose are typically non-severe and self-limiting, primarily affecting the gastrointestinal and reproductive systems. Symptoms documented in regulatory labels include nausea, vomiting, and breast tenderness. A specific hormonal outcome noted in females is the potential for withdrawal bleeding.

Official guidance mandates that individuals seek medical help right away upon discovery of an overdose. This required emergency action involves immediately contacting a healthcare provider, pharmacist, or a certified Poison Control Center. Individuals should not attempt to induce vomiting unless explicitly instructed to do so by a healthcare professional.

Because no specific antidote is known for this combination, any necessary management is classified as symptomatic and supportive treatment and is directed toward managing the presenting symptoms. Monitoring, which may include vital signs and laboratory tests, may be performed if required in an emergency setting.

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Therapeutic Uses of Seasonale

What Seasonale Treats: Main Uses and Benefits

Seasonale (Ethinyl Estradiol and Levonorgestrel) is a combination hormonal medication indicated for use by females of reproductive potential to prevent pregnancy. This primary therapeutic domain provides supportive contraception and assists with reliable reproductive planning.


Managing the Frequency of Scheduled Cycles

Seasonale is applied in an extended-cycle format, which supports sustained hormonal stability. A key therapeutic benefit is the reduction in the annual frequency of scheduled hormonal withdrawal bleeding. This approach is relevant in contexts where additional management of cyclical disruption is appropriate, and may help to ease the impact of monthly cycles on routine activities.


Symptomatic Relief for Cyclical Discomfort

The regimen is considered relevant for managing recurrent physical symptoms associated with the monthly cycle, such as dysmenorrhea (painful periods) and menstrual-related headaches. By reducing the frequency of hormone withdrawal, this therapy may contribute to a lower incidence of these recurrent symptom clusters and supports patients during episodes of heightened discomfort. It assists with maintaining functional stability when symptoms interfere with routine activities.


Quick Facts

Property Description
Primary Therapeutic Use Provides supportive pregnancy prevention
Key Cyclical Benefit Supports the reduction in annual frequency of scheduled hormonal withdrawal
Symptom Management Assists with managing dysmenorrhea and menstrual-related headaches
Clinical Context Used when minimizing cyclical disruption is relevant

Regulatory References

  1. NIH DailyMed Drug Information
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Eligibility and Restrictions for Use

Seasonale is indicated for use by females of reproductive potential to prevent pregnancy. However, official regulatory documents list several medical conditions and patient characteristics that prohibit or restrict its use.

Contraindications (Must Not Use)

Use is formally contraindicated if a woman has or develops a high risk of arterial or venous thrombotic diseases. This includes:

  • Smoking while being over 35 years old.
  • Current or history of deep vein thrombosis, pulmonary embolism, cerebrovascular disease, or coronary artery disease.
  • Known hypercoagulopathies, uncontrolled hypertension, or diabetes mellitus with vascular complications.

The medication is also prohibited for women who have:

  • Breast cancer or other estrogen- or progestin-sensitive cancers.
  • Liver tumors (benign or malignant) or active liver disease.
  • Undiagnosed abnormal uterine bleeding or are currently pregnant.

Eligibility Restrictions

Use is not recommended for women who are nursing as the hormones may decrease milk production. The medication should be started no earlier than four weeks after delivery in non-breastfeeding women due to the increased risk of thromboembolism. Furthermore, the drug must be stopped at least four weeks before and through two weeks after any major surgery associated with a high risk of blood clots.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Seasonale (levonorgestrel/ethinyl estradiol) interacts with numerous medicines and herbal products, primarily through mechanisms that alter the concentration of the contraceptive hormones in the body (pharmacokinetic interactions) or by causing additive side effects (pharmacodynamic interactions).

Pharmacokinetic Interactions

Medicines that decrease the exposure of contraceptive hormones may reduce effectiveness and increase the risk of breakthrough bleeding. This group primarily includes enzyme-inducing agents, particularly those that induce CYP3A4. Examples explicitly noted in regulatory documents include certain anticonvulsants (e.g., barbiturates, carbamazepine, phenytoin, topiramate) and the antituberculosis drug rifampin. The herbal supplement St. John's wort also falls into this category.

Conversely, drugs that increase hormone exposure, such as strong CYP3A4 inhibitors (e.g., itraconazole, ketoconazole), may lead to elevated plasma concentrations of ethinyl estradiol. Other agents like ascorbic acid and acetaminophen may also increase ethinyl estradiol levels by inhibiting conjugation.

Co-administration Constraints

Classification Examples of Interacting Agents
Contraindicated Combinations Hepatitis C drug combinations containing ombitasvir/paritaprevir/ritonavir, with or without dasabuvir.
Effectiveness Risk Enzyme inducers (e.g., rifampin, phenytoin), Colesevelam.

When co-administering Seasonale with enzyme-inducing agents, regulatory labeling indicates a need to use alternative or additional non-hormonal contraception.

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Mechanism of Action

How Seasonale Works

Seasonale works via the combined actions of its two synthetic hormones across multiple physiological levels.


Central Hormonal Axis Suppression

This domain focuses on the drug's action within the brain and pituitary gland. The synthetic hormones activate specific receptors, triggering a negative feedback signal that suppresses the release of Luteinizing Hormone ( LH) and Follicle-Stimulating Hormone ( FSH) . This inhibition prevents the necessary LH surge. This mechanistic cascade results in anovulation, which is the suppression of egg release from the ovaries.


Peripheral Physical Barrier Modulation

This domain covers the local, peripheral effects on the reproductive tract. The progestin component acts on the cervix and uterus, causing the cervical mucus to thicken and become viscous. Concurrently, the hormones modulate the endometrial lining, altering its morphology and biochemical composition. These tissue-level changes act as secondary mechanisms.


Component Synergy and Cycle Regulation

This domain describes how the two active ingredients work together and the consequence for the bleeding pattern. The estrogen component enhances the suppressive action of the progestin on the HPO axis. This synergy also helps stabilize the uterine lining over the extended 91-day cycle, which accounts for the scheduled extended withdrawal bleed.

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Dosage and Administration Information

How Seasonale is Used: Official Administration Guidelines

Seasonale (levonorgestrel and ethinyl estradiol) is administered orally according to a specific, continuous 91-day extended-cycle regimen for pregnancy prevention, as directed by official prescribing information.

Official Route and Dosage Form

Seasonale is a prescription-only medication taken exclusively by the oral route. It is supplied in a dispenser containing two types of film-coated tablets:

  • 84 Active Tablets (Pink): Each contains a fixed dose of 0.15 mg levonorgestrel and 0.03 mg ethinyl estradiol.
  • 7 Inert Tablets (White): These tablets contain no active hormones.

Standard Dosing Schedule

The regimen requires taking one tablet daily by mouth for the entire 91-day course at the same time every day. The course is structured as follows:

Dosing Phase Days Tablet Type Active Content
Active Dosing Days 1–84 Pink Active Tablets Levonorgestrel 0.15 mg / Ethinyl Estradiol 0.03 mg
Inactive/Hormone-Free Days 85–91 White Inert Tablets Inert (No hormones)

Procedural Instructions

To initiate the therapy, the first active tablet is typically taken on the first Sunday after the start of menstruation (Sunday Start method). For the initial 7 days of the first 91-day course, guidelines recommend the use of a non-hormonal back-up method of contraception. Upon completion of the 7-day inert tablet phase, the user must immediately begin the next 91-day course without interruption to maintain the extended-cycle schedule. The label is restricted to use by females of reproductive potential, with postpartum use generally advised no earlier than 28 days after delivery.

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Recent Clinical Evidence

Seasonale: Recent Clinical Evidence

Seasonale is an extended-cycle combined oral contraceptive, providing 84 days of active hormone followed by a 7-day placebo interval, which results in a scheduled withdrawal bleed (period) occurring four times per year. Major clinical trials have focused on comparing this regimen to the conventional 28-day cycle.


Contraceptive Efficacy

Studies suggest that the efficacy of Seasonale for pregnancy prevention is comparable to that of traditional 28-day cycle combined oral contraceptives. In clinical trials, the pregnancy rates observed in women aged 18 to 40 years were similar between the extended-cycle regimen and a standard 28-day regimen using the same hormone doses.

Bleeding Patterns

Compared to conventional 28-day cycles, the Seasonale regimen is associated with fewer scheduled withdrawal bleeds (four versus thirteen per year). However, research noted differences in unscheduled bleeding and spotting, particularly during the initial months of use. The incidence of unscheduled bleeding tends to decrease over successive 91-day cycles. Data from a pivotal study showed:

Cycle (91-day) Median Days of Unscheduled Bleeding/Spotting
Cycle 1 12 days
Cycle 4 4 days

Safety and Tolerability

The overall safety profile of the extended-cycle regimen is generally consistent with that of standard 28-day cycle combined oral contraceptives. The same risks associated with combined oral contraceptive use, such as venous thromboembolism (blood clots), apply to Seasonale. Common adverse events reported in clinical trials included headache, nausea, and breast tenderness. Discontinuation rates due to unacceptable bleeding were observed to be higher with Seasonale compared to the 28-day cycle, particularly early in treatment.

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Frequently Asked Questions (FAQ)

Common questions about Seasonale (FAQ)

Q: What is the main difference between Seasonale and a regular 28-day birth control pill?

A: Seasonale is an extended-cycle combined oral contraceptive. Regulatory documents state that the primary difference is the 91-day dosing schedule. This regimen is designed to provide a scheduled hormone-withdrawal bleed, or period, only four times per year, in contrast to the 13 scheduled bleeds associated with a conventional 28-day cycle.


Q: Is the risk of serious side effects the same as with other oral contraceptives?

A: Official safety information indicates the same serious risks, such as thromboembolic events (blood clots), are associated with Seasonale as with other combined oral contraceptives. These risks are emphasized in official labeling for all combined hormonal pills.


Q: Can Seasonale affect cholesterol levels or blood pressure?

A: Regulatory documents list changes to a user's health profile as potential findings. These include increased blood pressure and changes in serum lipid levels (cholesterol) among the potential adverse reactions or effects associated with the medication's use.


Q: Are there any herbal supplements that should be avoided while taking Seasonale?

A: Yes, official regulatory documents specifically note that the herbal supplement St. John's wort is a concern. It is described as an enzyme-inducing agent that may reduce the concentration of the hormones in Seasonale, potentially making the medication less effective.


Q: Does taking Seasonale affect mood or lead to depression?

A: Official adverse reaction reports and documents list depression and other mood changes among the side effects reported in users of this medication, indicating that some patients may experience emotional changes while on the drug.


Q: Does Seasonale affect bone density over time?

A: Research cited in official references has addressed this topic. Clinical studies did not show a statistically significant difference in changes to lumbar spine bone mineral density after 12 months between women using the extended regimen and a healthy reference group.


Q: Can Seasonale improve or worsen acne?

A: Acne is listed among the common side effects in the official adverse reaction reports for Seasonale. This indicates that some users may experience acne as a reported adverse reaction associated with use.


Q: Is Seasonale appropriate for women with a history of migraines?

A: The official prescribing information addresses this by stating that the use of combined hormonal contraceptives, including Seasonale, is generally contraindicated (prohibited) for women who have a history of migraines with aura due to an increased risk of stroke.


Q: Is Seasonale available in a generic version?

A: Yes, the Food and Drug Administration (FDA) has approved generic versions of the ethinyl estradiol and levonorgestrel combination that is used in Seasonale. These generic alternatives contain the same active ingredients as the brand name product.


Q: Can antibiotics reduce the effectiveness of Seasonale?

A: Regulatory documents indicate that certain antibiotics, including rifampin and some broad-spectrum types, may decrease the effectiveness of combined oral contraceptives. Regulatory labeling indicates a need to consider alternative or additional non-hormonal contraception when Seasonale is co-administered with these agents.


Q: Does caffeine or alcohol affect how Seasonale works?

A: While the impact of alcohol is not explicitly detailed in official safety information, regulatory documents have cited certain substances as potential interactors. These include caffeine (in high doses) and grapefruit juice, which have been listed as substances that may affect the metabolism of the active ingredients.


Q: Is Seasonale used for conditions other than contraception in some cases?

A: The medication is formally indicated by regulatory bodies for the primary purpose of effective pregnancy prevention for women of reproductive potential. Official drug labeling specifies this as the approved use.


Q: How often should a patient using Seasonale have follow-up appointments?

A: Regulatory safety information indicates that a healthcare provider should monitor a patient's progress, including checking blood pressure, through regular visits to ensure proper use. The frequency of these check-ups is determined by the prescribing professional.


Q: What should I do if I am vomiting or have diarrhea while on Seasonale?

A: Official regulatory guidelines describe that if a patient experiences vomiting or diarrhea for more than two days, the labeling suggests employing a non-hormonal back-up method of contraception for seven days, as effectiveness may be compromised.


Q: Is Seasonale still effective for women over 35?

A: Clinical trials for Seasonale's efficacy included women up to 40 years of age. Official information indicates that the drug's effectiveness is similar to conventional combined oral contraceptives, provided the user meets all eligibility criteria and has no contraindications, such as smoking after the age of 35.


Q: Can Seasonale be used by women who have had children?

A: Official labeling restricts the timing of use only during the immediate postpartum period (after delivery). Non-breastfeeding women are advised to begin no earlier than four weeks after delivery. Use outside of the postpartum period is not specifically restricted for women who have previously given birth.


Q: How is Seasonale packaged to help users follow the 91-day schedule?

A: Seasonale is packaged in an Extended-Cycle Tablet Dispenser. Regulatory documentation describes this dispenser as containing the full 13-week supply of 84 active (pink) tablets and 7 inert (white) tablets, designed to help guide the user through the 91-day regimen.


Q: Can I use Seasonale while breastfeeding?

A: Official sources advise that the use of combined hormonal contraceptives is not recommended while breastfeeding, especially within the first weeks postpartum. This is because the hormones may pass into the milk and potentially reduce milk production.

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How should Seasonale be stored and disposed of?

How to Store and Dispose of Seasonale

Seasonale tablets must be stored at Controlled Room Temperature (CRT), which is defined as 20 C to 25 C (68 F to 77 F). Brief temperature excursions are permitted between 15 C and 30 C (59 F and 86 F). The product should be kept in its original Extended-Cycle Tablet Dispenser and stored away from excess heat and moisture. Like all medications, it must be kept out of the reach of children.

For disposal, unneeded or expired tablets should be discarded using a drug take-back program if one is available. If a take-back program is not accessible, follow the specific FDA guidelines for safe household disposal of medicines.

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

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