Alysena 21

Quick links to important sections

Medically reviewed

Rosario Oropesa

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 Alysena 21

Quick Facts

Property Description
Active Ingredients Ethinyl Estradiol (20 mcg), Levonorgestrel (100 mcg)
Form Monophasic Oral Tablet
Pharmacological Class Combination Hormonal Contraceptive (CHC)
Common Use Pregnancy Prevention (Contraception)
Origin Synthetic Hormonal Medication

What Type of Medicine is Alysena 21? (Identity and Classification)

Alysena 21 is a Prescription-Only Medicine (POM), classified as a Combination Hormonal Contraceptive (CHC) and belonging to the class of Oral Contraceptive Pills (OCPs). The primary use of this synthetic hormonal medication is pregnancy prevention for women of reproductive potential. This combination formulation is clinically recognized for providing highly effective, systemic control over the reproductive cycle. As a widely available generic alternative, Alysena 21 shares its core formulation with several other established contraceptive brands, confirming its trusted position within hormonal contraception.

Composition and Form: Understanding the Monophasic Tablet

The foundation of Alysena 21 is a combination product containing two synthetic steroidal hormones: the estrogen Ethinyl Estradiol (EE) and the progestin Levonorgestrel (LNG). The product is manufactured as an oral tablet containing a fixed dose of 20 mcg of Ethinyl Estradiol and 100 mcg of Levonorgestrel. It is specifically designated as a monophasic oral contraceptive, meaning the concentration of both active hormones is identical and constant across all 21 active tablets in the regimen. Monophasic formulations are characterized by a steady hormonal supply, simplifying administration and helping to maintain consistent hormonal suppression.

High-Level Action: The Core Contraceptive Principle

The combined presence of synthetic estrogen and synthetic progestin works to achieve its general contraceptive purpose by interfering with the hormonal communication known as the Hypothalamic-Pituitary-Ovarian (HPO) axis. This continuous hormonal feedback primarily results in ovulation inhibition, which is medically recognized as the most critical step in preventing conception. Additionally, the medication alters the character of the cervical mucus, causing it to thicken significantly. This dual-action strategy provides a robust, multi-layered defense mechanism that is the hallmark of modern combination oral contraceptives.

Regulatory References

  1. Alysena 21 Product Information (Health Canada)

What side effects are possible with Alysena 21?

Possible Side Effects and Safety Information

The safety profile of Alysena 21 (Levonorgestrel/Ethinyl Estradiol) is structurally defined by official regulatory documentation, which classifies adverse reactions by frequency and the body system affected. These classifications range from very common, non-serious events to rare, clinically significant adverse reactions.

Frequency and System-Organ Classification

Adverse effects are categorized based on their rate of occurrence as documented in official regulatory labels. These effects involve several System-Organ Classes (SOCs), including Vascular, Gastrointestinal, Nervous System, and Reproductive System disorders.

Classification Examples of Officially Listed Adverse Reactions
Very Common Irregular bleeding (unscheduled bleeding/spotting)
Common Headache, nausea, abdominal pain, breast pain, weight increase
Rare Venous Thromboembolism (VTE), Arterial Thromboembolism (ATE), Hypersensitivity reaction

Serious Adverse Reactions and Safety Constraints

The official safety information highlights the risk of serious adverse reactions, particularly thromboembolic events such as Deep Vein Thrombosis, Pulmonary Embolism, Stroke, and Myocardial Infarction. The documented risk of these events is highest during the first year of use of a combination hormonal contraceptive.

Specific safety constraints define appropriate use. The risk of serious cardiovascular events is substantially increased in women over 35 years of age who smoke. Furthermore, the medication is contraindicated in individuals with severe hepatic disease and requires temporary discontinuation before and after major surgery or prolonged immobilization due to elevated VTE risk. These constraints reflect the regulatory standards for combination oral contraceptives.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information addresses the required actions and potential manifestations following an overdose of combination hormonal contraceptives like Alysena 21 (Levonorgestrel and Ethinyl Estradiol).

Documented Overdose Presentations

The FDA and other regulatory agencies state that an overdose of this medication is not expected to be life-threatening. However, specific symptoms are officially documented:

  • Nausea and Vomiting
  • Withdrawal bleeding (Vaginal bleeding that may occur 2 to 7 days after the overdose)
  • Breast tenderness

Required Emergency Actions

When an overdose is suspected, the following immediate actions are mandated by official prescribing information to ensure proper clinical assessment and guidance:

  • Seek medical help right away.
  • Call Poison Control or local emergency services immediately.
  • If assessed by a healthcare provider, management is primarily symptomatic and supportive, as no specific antidote is available.

Management and Monitoring

Official documents indicate that vital signs must be measured and monitored. While there is no specific antidote, measures such as activated charcoal may be considered in certain cases to limit drug absorption, and blood and urine tests may be performed during clinical observation.

Therapeutic Uses of Alysena 21

What Alysena 21 treats: Main Uses and Benefits


The primary therapeutic benefit of Alysena 21 is generally used for sustained contraception for women of reproductive potential. This function supports patients by providing continuous protection against unintended pregnancy. The medication is relevant for easing certain cyclical and skin-related symptoms.

The medication is commonly used to help with conditions that present with symptoms related to systemic imbalance, including menstrual pain (dysmenorrhea) and heavy menstrual bleeding (menorrhagia). It is applied in addressing a specific subset of androgen-related skin manifestations, offering symptomatic relief for moderate acne vulgaris. Its use is generally used in situations involving recurrent or episodic manifestations.

“This medication contributes to improved comfort during periods of heightened symptoms.”

Quick Fact: Relief for Cyclical Discomfort
Symptom Domain Benefit Provided
Menstrual Pain (Dysmenorrhea) May assist with symptoms related to physical discomfort.
Heavy Bleeding (Menorrhagia) Is used for managing symptoms that interfere with daily functioning.
Moderate Acne Vulgaris Plays a role in managing symptoms that create noticeable physiological strain.

Regulatory References

  1. MedlinePlus Drug Information on Ethinyl Estradiol and Levonorgestrel

Eligibility and Restrictions for Use

Alysena 21 (Ethinyl Estradiol 20 mcg / Levonorgestrel 100 mcg) is a prescription medicine whose use is strictly defined by regulatory criteria, primarily focusing on managing the risk of serious cardiovascular and thromboembolic events.

The eligibility profile is structured around absolute prohibitions (contraindications) and conditional restrictions, as outlined in official product information.

Who Must Not Use Alysena 21 (Contraindications)

Alysena 21 is contraindicated and must not be used by individuals with the following official restrictions:

  • Vascular History: Current or history of blood clots (e.g., DVT, PE), stroke, or coronary artery disease.
  • Smoking and Age: Women over 35 years of age who smoke (any amount) due to the significantly increased cardiovascular risk.
  • Specific Conditions: Patients with uncontrolled hypertension, migraine headaches with aura, active liver disease (including hepatic tumors), or diabetes with vascular involvement.
  • Malignancy: Known or suspected estrogen-sensitive cancers, such as breast cancer.
  • Pregnancy: If pregnancy is known or suspected.

Eligibility Limitations and Special Populations

Category Regulatory Status
Age Approved for females who have attained menarche; not indicated for postmenopausal women.
Lactation Not recommended for use by nursing mothers as it may affect milk production.
Surgery/Immobilization Must be discontinued at least four weeks before and not restarted until two weeks after major surgery or prolonged immobilization.

The use of Alysena 21 is officially confined to females of reproductive potential who meet these specific safety criteria, while use is not established or not indicated in pre-menarche or postmenopausal populations.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

Co-administration of Alysena 21 with certain other medications or products may alter its effectiveness, requiring specific management strategies as documented in official regulatory labeling. This is primarily due to pharmacokinetic interactions, where other substances interfere with the metabolism or absorption of the hormonal components.


Documented Interacting Agents

Product Category Specific Interacting Substances (Examples)
Enzyme-Inducing Agents Phenytoin, Phenobarbital, Primidone, Carbamazepine, Rifampicin, Ritonavir, Griseofulvin, Modafinil, St. John's Wort (Hypericum perforatum)
HCV Antivirals Ombitasvir, Paritaprevir, Ritonavir, Dasabuvir
Other Agents Penicillins, Tetracyclines, Troleandomycin

Interaction-Related Constraints

Official labeling outlines constraints based on the type of interaction:

  • Reduced Effectiveness Risk: The use of enzyme-inducing agents, such as those for epilepsy or tuberculosis, may make the oral contraceptive less effective. During any cycle when these agents are used, a non-hormonal method of contraception must be consistently utilized.
  • Specific Avoidance: Co-administration with certain Hepatitis C virus ( HCV) antiviral product combinations is subject to specific regulatory constraints and is generally avoided or requires discontinuation of the contraceptive.
  • Absorption Interference: Episodes of vomiting or severe diarrhea within four hours of administration may impair the absorption of the pill, requiring management as a missed dose to maintain efficacy.

Mechanism of Action

Alysena 21, a combination oral contraceptive, exerts its primary physiological modulation through the actions of its synthetic progestin and estrogen components, levonorgestrel and ethinyl estradiol, respectively. The biological targets are primarily the hypothalamic-pituitary-ovarian (HPO) axis and the endometrium.

Levonorgestrel functions as a progestin receptor (PR) agonist in target tissues, binding with high affinity to intracellular PRs. Ethinyl estradiol acts as an estrogen receptor (ER) agonist. The combination of these synthetic steroids induces a pseudo-pregnancy state, leading to negative feedback on the hypothalamus and anterior pituitary gland.

The intracellular consequences of this agonist binding include the modulation of gene expression, which results in a significant reduction in the pulsatile secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus. This, in turn, suppresses the pituitary release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). The systemic suppression of LH and FSH leads to the inhibition of follicular development and the prevention of ovulation.

Furthermore, levonorgestrel acts locally on the cervix and endometrium. Its progestational effects induce changes in the cervical mucus, increasing its viscosity and rendering it less permeable to sperm. Within the endometrium, the compounds induce glandular atrophy and stromal decidualization, which alters the tissue's morphology and function.

Dosage and Administration Information

Alysena 21 is an oral contraceptive administered on a 21-day active pill schedule followed by a 7-day tablet-free interval. One active tablet is taken by the oral route daily at approximately the same time each day for 21 consecutive days. The pills may be taken with or without food.

Starting the First Pack

There are two official methods for starting the first package, which apply to post-menarcheal females:

  • Day 1 Start: Take the first tablet on the first day of menstrual bleeding.
  • Sunday Start: Take the first tablet on the first Sunday after menstrual bleeding begins. If starting on a Sunday, a non-hormonal backup method (e.g., condoms) is required for the first seven days of the first cycle.

Missed Dose Rules

Strict adherence to the 24-hour interval is required. Instructions for missed doses vary by the number of pills missed and the week in the cycle.

Active Tablet(s) Missed Action to Take
One active tablet (less than 48 hours late) Take the tablet as soon as possible, and continue the remaining pills at the usual time (two may be taken in one day). No additional contraceptive protection is needed.
Two or more active tablets (48 hours or more late) in Week 1 or 2 Take the most recently missed tablet as soon as possible, discard others. Continue taking the remaining pills at the usual time. Use a backup method for 7 consecutive days.
Two or more active tablets in Week 3 Omit the 7-day tablet-free interval; start a new pack immediately after finishing the active tablets in the current pack. Use a backup method for 7 consecutive days.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Alysena 21

Evidence for Use in Pregnancy Prevention (Contraception)

The primary use of this medication was evaluated in numerous large-scale studies, including Randomized Controlled Trials (RCTs) and extensive observational research. These studies typically examined metrics related to avoiding unintended pregnancy, specifically measuring contraceptive failure rates (Pearl Index), adherence, and the suppression of ovulation across participants. While research describes patterns related to these metrics, the difference between failure rates observed under ideal circumstances and those in real-world settings is not fully established. Data remain insufficient to fully determine long-term adherence patterns beyond the standard one-year observation period.

Evidence for Managing Menstrual Symptoms

The research base for conditions characterized by fluctuating manifestations, such as Menstrual Pain (Dysmenorrhea) and Heavy Menstrual Bleeding (Menorrhagia), includes short-term and intermediate-term trials. Researchers explored outcomes related to physical discomfort by evaluating patient-reported pain scores and assessed systemic or functional imbalance by documenting measured blood loss and shifts in iron levels. Findings were sometimes mixed, and the evidence quality varies across studies. Follow-up durations were typically limited to six cycles, providing only intermediate-term data on these outcomes.

Evidence for Use in Moderate Acne Vulgaris

Research explored the use of this medication in women with Moderate Acne Vulgaris through Randomized, Double-Blind, Placebo-Controlled Clinical Trials. These studies examined outcomes linked to inflammatory states, monitoring metrics such as changes in inflammatory and non-inflammatory lesion counts and overall skin appearance scores. Studies described patterns related to these outcomes over the six-month observation period. However, long-term effects are not fully established because follow-up durations were limited, and comparative evidence against every alternative acne treatment remains lacking.

Key Gaps and Uncertainties in Research

While research describes outcomes for its primary and secondary uses, several aspects remain uncertain. Data for certain groups remain insufficient, as main trials included mostly healthy women of reproductive age. Consequently, outcomes cannot necessarily be generalized to women with co-existing chronic health issues. Follow-up durations were limited across non-contraceptive trials, and evidence detailing the long-term durability of observed patterns is still emerging.

Key Studies & References

  1. Ethinyl Estradiol and Levonorgestrel Drug Information (Contraception and General Use)
  2. Ethinyl Estradiol and Levonorgestrel Drug Information (Secondary Use for Menstrual/Acne Symptoms)

Frequently Asked Questions (FAQ)

Common questions about Alysena 21 (FAQ)


Q: How is Alysena 21 different from other 21-day oral contraceptives?

Alysena 21 is a generic version of a combination oral contraceptive. According to its official composition, it is a monophasic formulation, meaning all 21 active tablets contain the same fixed doses of levonorgestrel and ethinyl estradiol. This consistent dosing is what differentiates it from other types of oral contraceptives.


Q: Does Alysena 21 cause weight gain according to patient reports?

Weight increase is officially listed as a Common adverse reaction in the medication’s safety information. While individual experiences vary, official patient guidance indicates that changes in weight have been reported by some users. This type of effect is often described as occurring less commonly with low-dose combination pills.


Q: Is spotting or breakthrough bleeding common when starting Alysena 21?

Irregular bleeding, including spotting between expected periods, is classified as a Very Common adverse reaction. This is often part of the adjustment period when starting the medication. Regulatory patient information often describes that this side effect may lessen or resolve after the first few months of consistent use.


Q: What are the most commonly reported side effects of Alysena 21?

Based on official safety data, commonly reported adverse reactions include headache, nausea, breast pain, and an increase in body weight. These effects are classified as common in the medication's safety profile.


Q: Do many users report changes in mood while taking Alysena 21?

Yes, changes in mood are noted as officially reported adverse reactions in the safety profile of the medication. Some women in studies have reported changes in mood, including mental depression and anxiety.


Q: How does Alysena 21 affect the menstrual cycle pattern?

The 21-day active regimen followed by a tablet-free interval is designed to provide hormonal control that regulates the cycle. This regimen aims to regulate the cycle pattern, leading to a scheduled withdrawal bleed during the tablet-free interval. The flow associated with this bleed is often reported as lighter or shorter compared to a typical period.


Q: Does caffeine interact with Alysena 21?

Official regulatory documents that describe known drug interactions do not list caffeine as a substance that requires specific management or precautions when taken with Alysena 21.


Q: Are there any studies on long-term use of Alysena 21?

Clinical trials have evaluated outcomes over short-term and intermediate-term periods. Official labeling notes that the long-term effects beyond the duration of these trials are not fully established, and evidence on the durability of the observed patterns is still emerging.


Q: What is the general duration of use for Alysena 21 for most patients?

The medication is indicated for use by females of reproductive potential for pregnancy prevention. Regulatory documents indicate that there is no official maximum time limit specified for use.


Q: Is Alysena 21 suitable for women over the age of 35?

Official warnings state that use is contraindicated for women over 35 years of age who smoke. For non-smokers in this age group, the medication requires a medical assessment of individual cardiovascular risk factors to determine appropriateness.


Q: Is it true that Alysena 21 can increase the risk of blood clots?

Yes, official safety warnings classify the risk of thromboembolic events, such as Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE), as serious adverse reactions. The highest documented risk for these events is observed during the first year of use of any combination hormonal contraceptive.


Q: Can Alysena 21 be used by people who have migraines?

The medication is contraindicated for patients with migraine headaches with aura. Official medical guidance notes that migraines without aura do not represent an absolute contraindication, but they are factored into a safety assessment.


Q: What if I experience nausea after starting Alysena 21?

Nausea is classified as a Common adverse reaction, which is often experienced when first starting the medication. Official information indicates this effect may be temporary and has been reported to lessen or resolve after the initial adjustment period.


Q: Is it common for acne to improve or worsen on Alysena 21?

The medication is studied for its use in managing moderate acne vulgaris. The hormonal components are associated with the ability to reduce certain hormonal effects, which is linked to improvements in skin appearance over several months in research studies. Acne is also listed as an adverse reaction in some reports.


Q: How quickly do the hormones in Alysena 21 leave the body after stopping?

The active hormones are eliminated relatively quickly, as described by their half-lives in the pharmacokinetics section of the label. The levonorgestrel component has an elimination half-life of approximately 36 hours, and the ethinyl estradiol component has a half-life of about 18 hours.


Q: Are there different dosages of Alysena 21, or is there only one strength?

Alysena 21 is approved in only one fixed-dose strength. Each active tablet contains the same amount of both levonorgestrel and ethinyl estradiol.


Q: Is Alysena 21 gluten-free or suitable for people with allergies?

Official documents list the non-medicinal ingredients (excipients) in the tablets, which include lactose monohydrate along with others. A review of the complete list of ingredients is advised for individuals with known allergies or sensitivities.


Q: What kind of research evidence supports the use of Alysena 21?

Research evidence supports the medication’s primary use for contraception through large-scale clinical trials. Additionally, studies exist for its use in managing menstrual symptoms, such as pain and heavy bleeding, and its use in treating moderate acne vulgaris.


Q: Can Alysena 21 interfere with liver function test results?

Official labeling states that hormonal contraceptives are known to affect various laboratory test results. This includes parameters related to liver function, which may lead to changes in certain lab values.


Q: Is there a relationship between Alysena 21 and changes in vision?

Rare but serious ocular complications, such as retinal vein thrombosis, are noted in the safety profile of combined oral contraceptives. Changes such as blurred vision have also been reported in postmarketing experience.


Q: Does Alysena 21 have any known uses besides contraception?

In addition to pregnancy prevention (contraception), the medication is researched for and used by healthcare providers in the management of conditions such as menstrual symptoms and moderate acne vulgaris.


Q: Can Alysena 21 affect cholesterol levels?

Hormonal contraceptives are known to affect the body’s lipid metabolism and can influence laboratory values related to cholesterol and triglyceride levels, according to regulatory documents on laboratory test interactions.


Q: Do regulatory agencies classify Alysena 21 as low-dose?

Alysena 21 contains 20 mu g of ethinyl estradiol. This amount is generally recognized in medical consensus as a low-dose component for combination hormonal contraceptives, which is a factor considered in the safety profile.


Q: Is it normal to miss a period while using the 21-day formulation?

An absence of withdrawal bleeding during the 7-day tablet-free interval is a known possibility for some users, even when the medication is taken correctly. This can be due to the strong hormonal suppression, which results in a very thin uterine lining.

How should Alysena 21 be stored and disposed of?

Storage and Handling

Alysena 21 tablets must be stored at room temperature, typically between 15 C and 30 C (59 F and 86 F), as defined in official labeling.

Storage Requirement Official Classification
Temperature Range Room temperature (15°C to 30°C)
Protection Constraints Protect from moisture, excessive heat, and direct sunlight.
Prohibited Conditions Keep from freezing.
Packaging Rule Store in the original container.

For child safety, the medicine must be stored out of the reach and sight of children.

Disposal Instructions

To dispose of unused or expired Alysena 21, the official instruction is to return the medication to the pharmacy or an approved collection site. This ensures proper handling of pharmaceutical waste according to regulatory guidelines.

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

Available in countries:

Equivalent of Alysena 21 found in:

A-Z Index: