Mercilon

Quick links to important sections

Mercilon

Selected form

Medically reviewed

Marina Burgos

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 Mercilon

Quick Facts

Property Description
Active ingredient Desogestrel, Ethinyl Estradiol
Form Tablet
Pharmacological class Combined Hormonal Contraceptive (CHC)
Common use Contraception
Origin Synthetic hormones

What Type of Medicine is Mercilon?

Mercilon is a prescription-only combined hormonal contraceptive (CHC) administered as a monophasic oral contraceptive pill. The drug belongs to the pharmacological group designated as progestogens and estrogens in fixed combinations. Its identity is defined by the consistent use of two classes of synthetic hormones delivered via a daily tablet for oral intake.

This classification places Mercilon within a category of medicines clinically recognized for their systemic effect on the reproductive cycle. As a monophasic fixed-dose combination, the amount of active ingredients remains constant across the entire hormone-containing segment of the dosage cycle, providing reliable and predictable hormone modulation. Combined oral contraceptives are recognized for their efficacy in preventing pregnancy.

What is the Composition of Mercilon?

The composition of Mercilon includes the active ingredients desogestrel and ethinyl estradiol. Desogestrel is characterized as the progestogenic component, while ethinyl estradiol serves as the estrogenic component. Both compounds are synthetic hormones and are combined to offer comprehensive hormone modulation.

This specific formulation utilizes desogestrel, a third-generation progestogen, alongside ethinyl estradiol, a widely utilized synthetic estrogen. The oral tablet form and specific combination differentiate Mercilon from older combination pills, offering a modern, distinct ratio of the two hormonal components within the solid dosage form.

What is Mercilon Used For?

The primary general purpose of Mercilon is contraception, offering effective prevention of pregnancy for women of reproductive age. Its function is achieved through systemic hormone modulation, which suppresses the physiological processes that lead to fertilization. A typical, neutral use scenario involves a patient seeking a highly reliable and reversible form of birth control.

This combined hormonal action offers a highly reliable method for regulating the reproductive cycle, working by inhibiting ovulation, altering cervical mucus, and modifying the uterine lining. This collective action provides a strong, systemic barrier to pregnancy.

Regulatory References

  1. WHO IARC Monograph 91 on Combined Estrogen–Progestogen Contraceptives

What side effects are possible with Mercilon?

Possible Side Effects and Safety Information

Mercilon, like all combined oral contraceptives, is associated with a range of possible side effects. The most serious safety consideration is a small, increased risk of thromboembolic disorders (blood clots), which include deep venous thrombosis (DVT), pulmonary embolism (PE), myocardial infarction, and stroke. This risk is highest during the first year of use.

Serious, but rare, safety concerns also include the development of benign or malignant liver tumours and conditions that may be caused or worsened by the drug, such as chloasma (skin discoloration) and specific types of migraine.

Adverse Reactions by Frequency

Classification Examples of Reactions
Common Headache, nausea, vomiting, breast tenderness/pain (mastodynia), breakthrough bleeding, changes in body weight, and intolerance to contact lenses.
Rare Venous or arterial thromboembolic events (VTE/ATE).
Very Rare Liver tumours.

Safety Restrictions and Contraindications

Mercilon must not be used by individuals with a history of or current venous or arterial thromboembolic events, known or suspected breast cancer, severe liver disease (until liver function is normal), and undiagnosed abnormal vaginal bleeding. Caution is necessary for women who are smokers over the age of 35 due to a significantly elevated cardiovascular risk, or those with other risk factors for thrombosis (e.g., obesity or uncontrolled hypertension).

The medication should be discontinued immediately if any signs of a blood clot, severe new-onset headache, or jaundice occur.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documents define the overdose profile of Mercilon (desogestrel/ethinyl estradiol) as generally having low acute toxicity. In cases of acute overdose, serious or life-threatening symptoms are considered very unlikely according to authoritative sources.

Domain Official Regulatory Statement
Documented Manifestations Symptoms primarily include nausea, vomiting, and breast tenderness. Withdrawal bleeding may occur in females, typically a few days after the acute event.
Severity Classification Acute overdose is generally classified as not life-threatening.
Antidote Status No specific antidote is known for Mercilon overdose.

Required Emergency Actions

Immediate medical attention is mandated following an acute overdose event. Official guidance instructs the user to seek medical help right away or call a poison control center for specific guidance on next steps. It is important to note that the guidance specifies not to attempt to induce vomiting unless directly instructed by a healthcare professional.

Supportive Management

Treatment for overdose is strictly symptomatic and supportive. This approach is required because no specific means exist to reverse the effects of the hormonal combination. If assessment in an emergency setting is necessary, monitoring of vital signs (temperature, pulse, breathing, blood pressure) and laboratory tests may be performed. The potential for withdrawal bleeding is also noted as a possible finding in pre-pubertal females.

The regulatory profile dictates that while the overdose risk is low, immediate medical contact is the necessary first step to ensure proper evaluation and management, exclusively using supportive measures.

Therapeutic Uses of Mercilon

What Mercilon Treats: Main Uses and Benefits

Mercilon, a combined hormonal contraceptive, is generally used for reversible pregnancy prevention in women of reproductive age. It is considered highly reliable and plays a role in managing fertility management. This application is used in areas where short-term symptom management is appropriate for this domain.

Beyond contraception, the medication is applied across domains where patients experience distressing cycle-related symptoms. It is relevant for easing pronounced symptoms of abnormally heavy periods (menorrhagia), severe painful cramping (dysmenorrhea), and is used for managing menstrual irregularity. It also helps address symptom clusters that may become intense or disruptive, offering symptomatic relief that helps patients cope more steadily. Separately, it is commonly used to help with additional support for symptom management needed for acne vulgaris associated with systemic imbalance.


Quick Fact: Relief for Cycle Distress

Property Description
Primary Indication Highly reliable pregnancy prevention
Symptom Relief Heavy bleeding, severe cramps, and menstrual irregularity
Supportive Use Helps manage hormonally-influenced acne
Patient Benefit Improved comfort and assists with maintaining functional stability

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Mercilon — Official Regulatory Information

Mercilon, a combined hormonal contraceptive, is intended for women of reproductive age seeking contraception. Its eligibility profile is strictly defined by government regulatory documents, primarily focusing on pre-existing medical conditions that prohibit use.


Eligibility Scope
Populations for whom use is allowed (as stated in label): Women of reproductive age.
Populations for whom use is not recommended: Nursing mothers/Breastfeeding women.

Eligibility Severity Classification (Absolute Contraindications)
Thromboembolic Disorders: Current or history of arterial or venous blood clots (DVT, PE, Stroke, Heart Attack), or predisposing disorders.
Cancer and Tumors: Known or suspected sex hormone-influenced malignancies (e.g., breast cancer) or liver tumors.
Metabolic/Vascular Disease: Smoking by women over 35 years of age; severe hypertension; diabetes mellitus with vascular involvement.
Liver Status: Severe hepatic disease until function is normalized; pancreatitis associated with severe high fat levels in the blood.

Age-related eligibility rules state the product is not indicated for use in elderly women, and use should not be initiated before menstruation (post-menarche). Pregnancy is an absolute contraindication, and it must be excluded before starting the medicine.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information describes interactions for Mercilon (Desogestrel/Ethinyl Estradiol) primarily in terms of altered drug exposure and formally prohibited combinations. Co-administration is contraindicated with certain drug regimens, and usage restrictions exist based on population characteristics due to interaction risks.

Documented Interaction Categories

Category Officially Documented Interaction Pattern
Formal Contraindication Prohibited co-administration with Hepatitis C regimens containing ombitasvir, paritaprevir, ritonavir, and dasabuvir, or glecaprevir/pibrentasvir. Prohibited for women aged 35 years or older who smoke due to heightened cardiovascular risk.
Exposure Decrease Co-administration with hepatic enzyme-inducing medicines (e.g., Rifampin, certain anticonvulsants, St. John's Wort) is documented to increase the clearance of the hormonal components, resulting in reduced plasma levels.
Exposure Increase Mercilon components are documented to increase the plasma concentration of co-administered medicines subject to metabolic inhibition, such as Caffeine. Grapefruit juice is also documented to potentially increase the exposure of ethinyl estradiol.
Other Drug Effects Co-administration may reduce the plasma levels of other medicines, such as Lamotrigine, and the use of Tranexamic Acid is not recommended due to official documented concerns.

These official interaction statements define specific constraints on co-administration, categorized by the resulting change in drug exposure or by explicit regulatory prohibition.

Mechanism of Action

Central Suppression of the HPO Axis

The primary mechanism involves the active metabolite of desogestrel, etonogestrel, and ethinyl estradiol, acting as agonists on the Progesterone (PR) and Estrogen (ER) receptors, respectively. This hormonal activation imposes a strong negative feedback signal on the pituitary gland, suppressing the release of gonadotropins (FSH and LH). This modulation of the Hypothalamic-Pituitary-Ovarian (HPO) axis prevents the LH surge, resulting in the primary physiological consequence of anovulation (inhibition of egg release).


Peripheral Barriers: Cervical Mucus and Endometrium

Complementing the central action, the progestogenic component induces two local physiological changes. It causes the cervical mucus to become significantly thicker and less permeable, physically impeding the movement of sperm. Concurrently, the hormonal profile alters the structure of the endometrium (uterine lining), making it unreceptive. These simultaneous peripheral mechanisms create redundant physiological barriers that contribute to the drug's overall physiological effect. The synergistic activity supports the maintenance of HPO axis suppression throughout the cycle.

Dosage and Administration Information

How to Use Mercilon: Official Administration Guidelines

Mercilon is an oral tablet prescribed for use in a continuous, cyclic pattern, and its administration is defined by guidelines focusing on consistent daily intake of a fixed dose.


Administration Scope

Instruction Detail
Route of administration Oral use only.
Dosing schedule One fixed-dose tablet (0.15 mg Desogestrel / 0.02 mg Ethinyl Estradiol) daily.
Timing in relation to meals May be taken with or without food.
Preparation requirements Swallow the tablet whole with liquid as needed; no dilution or other preparation is necessary.
Age-group administration rules The standard regimen applies to women of reproductive age; official documents do not specify numerical dose adjustments for populations such as older adults.
Missed-dose rules If an active tablet is missed by less than 12 hours, take the tablet immediately, and continue with the remaining tablets at the usual time.
Special procedural conditions Tablets must be taken in the order directed on the packaging and at approximately the same time each day.

Instruction Classifications (High-Level)

Classification Detail
Administration method type Oral.
Frequency pattern Once daily within a cyclic regimen.
Regulatory basis Governed by data from national and intergovernmental health authorities.
Use-context constraints Use is structured around a strict 21-day active/7-day pill-free cyclic pattern for continuous, long-term use.

Resulting Procedural Structure

Official step sequence:

  • Take one tablet daily at approximately the same time each day.
  • Tablets must be taken in the order directed on the blister pack.
  • Follow a cycle of 21 consecutive days of active tablet intake, followed by a 7-day tablet-free interval.

Connection to the overall use protocol (2–4 sentences): The official instructions establish an oral route of administration using a fixed daily dose (0.15 mg/0.02 mg) which is taken consistently. The core protocol dictates strict adherence to the 21/7 cyclic schedule and consistent daily timing. This procedural structure ensures the medicine is taken exactly as defined by approved guidelines, maintaining the intended continuous pattern of use.

Recent Clinical Evidence

Mercilon: Recent Clinical Evidence

Mercilon is a combined oral contraceptive containing the hormones ethinylestradiol (20 mug) and desogestrel (150 mug). As a low-dose formulation, research has focused on maintaining its high contraceptive efficacy while examining its side effect profile, cycle control, and metabolic effects compared to higher-dose pills.


Efficacy and Cycle Control

Clinical trials involving the 20 mu g ethinylestradiol/150 mu g desogestrel combination have reported high contraceptive effectiveness, with a low incidence of method failure observed across thousands of cycles of use. Key findings on cycle control include:

  • Regularity: Over 80% of women in studies reported regular menstrual cycles.
  • Bleeding Patterns: The incidence of breakthrough bleeding and spotting was highest in the initial cycle of use, typically decreasing to low values (less than 7%) by the sixth treatment cycle.

Safety and Metabolic Findings

Research has explored the drug's impact on various metabolic and safety parameters, often comparing it to combined oral contraceptives (COCs) containing 30 mu g of ethinylestradiol.

Parameter Observed Change in Studies
Body Weight No significant or clinically relevant changes observed.
Blood Pressure Remained stable or showed no significant changes in the study groups.
Blood Clots (VTE) Combined hormonal contraceptives carry an increased risk of venous thromboembolism (VTE) compared to non-use. Studies have indicated that the absolute risk for desogestrel-containing pills, while low, may be slightly higher than for pills containing levonorgestrel.
Lipid Profile Studies observed changes in serum lipids, including an increase in HDL-C (good cholesterol) and triglycerides. Some comparisons suggested a potentially favorable effect on LDL-C (bad cholesterol) compared to the 30 mu g ethinylestradiol dose.

Adverse events reported in the reviewed studies were primarily classified as non-serious, with the most common being headache, nausea, and breast tenderness.

How should Mercilon be stored and disposed of?

The storage and disposal of Mercilon tablets are governed by specific regulatory requirements to ensure product stability and safety.

Storage Requirements

Mercilon must be stored at or below 25 C and must not freeze. It is mandatory to store the tablets in the original package and pouches to provide the necessary protection from light and moisture. Maintaining these conditions is essential for the product's official 3-year shelf life. Furthermore, the medicine must be kept out of the sight and reach of children.

Disposal Instructions

Any unused or expired Mercilon, as well as associated waste material, must be disposed of in accordance with local requirements. Official guidance advises against throwing the medicine into household waste or flushing it down wastewater systems, directing disposal through appropriate pharmaceutical collection programs.

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

Available in countries:

Equivalent of Mercilon found in:

A-Z Index: