Microfem

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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 Microfem

Property Description
Active ingredient Ethinyl Estradiol, Levonorgestrel
Form Tablet (Oral dosage form)
Pharmacological Class Combined Hormonal Contraceptive (CHC)
Common Use Prevention of pregnancy (Contraception)
Origin Synthetic hormones

Microfem is a prescription-only medication classified as a Combined Oral Contraceptive (COC) tablet. It functions as a synthetic hormonal contraceptive for the general indication of prevention of pregnancy in women of reproductive age. This combination is utilized as a primary method of fertility control.


What Type of Medicine Is Microfem? (Identity and Class)

Microfem is a systemic agent belonging to the Combined Hormonal Contraceptive (CHC) class, which is a subcategory of Steroidal Contraceptives. It is typically utilized as a monophasic oral contraceptive, meaning the concentration of the active ingredients remains consistent for a defined period of hormone-containing pills within the monthly cycle.

This medication is supplied as an oral dosage form, specifically a tablet, intended for systemic absorption following the oral route of administration. CHCs are recognized as a well-established method of birth control, utilizing a standardized pharmacological strategy to manage fertility.


Composition: Ethinyl Estradiol and Levonorgestrel (Ingredients and Origin)

The active pharmacological components of Microfem are the two synthetic hormones: Ethinyl Estradiol (the estrogen component) and Levonorgestrel (the progestin component), forming a chemically defined pairing. This specific pairing is one of the most widely utilized combinations globally, characterized by its extensive use in clinical practice.

As a combination product, Microfem utilizes the synergy between these two synthetic molecules, which are manufactured to mimic and regulate the body’s natural reproductive hormones. Both Ethinyl Estradiol and Levonorgestrel are identified as essential medications for their role in contraception. The physical tablets are composed of these active ingredients alongside necessary inert solid oral excipients, facilitating their stable delivery and release in the body.

Regulatory References

  1. World Health Organization (WHO) Essential Medicines List
  2. WHO Essential Medicines

What side effects are possible with Microfem?

Possible side effects and safety information

The safety profile for this combined hormonal contraceptive (Ethinyl Estradiol and Levonorgestrel) is formally categorized by regulatory bodies based on the frequency and system-organ class of reported events. Common adverse reactions include headache, nausea, breast tenderness, weight gain, and irregular uterine bleeding (breakthrough bleeding or spotting). These common effects are generally most noted during the first few months of use.


The most serious, though rare, safety concerns officially documented are Thromboembolic Events, which encompass both Venous Thromboembolism (VTE), such as deep vein thrombosis and pulmonary embolism, and Arterial Thromboembolism (ATE), such as stroke and myocardial infarction. The highest risk of VTE is noted during the first year of initial use. Other documented serious risks include Hypertension and Hepatic Neoplasms (liver tumors).


Safety Restrictions and Special Populations

The regulatory label specifies explicit constraints on use for certain populations. The medicine is contraindicated in women over the age of 35 who smoke, due to a substantially increased risk of serious cardiovascular events. It is also not generally recommended for use in the immediate postpartum period or in women who are currently breastfeeding. Furthermore, official safety constraints require temporary discontinuation during periods of prolonged immobilization or if an arterial or venous thrombotic event is suspected or confirmed. It is also formally stated that this medicine does not protect against Human Immunodeficiency Virus (HIV) infection or other sexually transmitted infections.

Overdose and Emergency Response

Overdose and When to Seek Help

This information describes the documented manifestations and required emergency actions for an overdose of Microfem (Ethinyl Estradiol/Levonorgestrel), based on official government regulatory sources.


Documented Manifestations and Severity

Acute overdose from the hormonal components is generally classified by regulatory bodies as unlikely to be life-threatening. However, specific clinical signs are officially documented:

Documented Manifestations Severity Classification
Nausea, vomiting, and vaginal bleeding (withdrawal/breakthrough bleeding) Acute overdose is not likely to be life-threatening
Breast tenderness, headache, drowsiness, or discolored urine No specific antidote is known for the combination

Required Emergency Actions and Management

Regulatory guidance strictly mandates specific actions when overdose is suspected, regardless of the expected severity:

  • Seek medical help right away or immediately call a poison control center.
  • Urgent medical attention is required for sudden, severe symptoms, such as loss of consciousness or intense pain.

Official management for overdose is primarily symptomatic treatment and supportive care.

  • Population Note: Official guidance states that if a child accidentally swallows the tablets, few short-term effects are expected from the hormone components, and it is not considered a danger.

This structure reflects the regulator-defined scenario: while the acute risk is low, immediate professional contact is mandatory to assess symptoms and initiate supportive measures.

Therapeutic Uses of Microfem

Microfem is commonly used to help manage symptoms related to physical discomfort and systemic imbalance, supporting patients with symptomatic relief. Combination pills may be utilized across domains where additional symptomatic support is needed.


Therapeutic Utility

The medication's primary therapeutic domain is providing long-term support for the prevention of pregnancy. Secondary applications include the management of symptoms in conditions characterized by periods of heightened discomfort. These uses include helping to manage cycle irregularity, addressing severe menstrual cramping (dysmenorrhea), and easing excessive monthly blood loss (menorrhagia), as well as providing supportive relief for mild-to-moderate acne vulgaris.

Quick Fact: Relief for Menstrual Distress Microfem is generally used to help ease the intensity of symptoms related to menstrual pain and help manage symptoms related to excessive blood loss, which supports patients during episodes of heightened discomfort and contributes to easing the overall symptom load.

The application across these therapeutic domains provides support that helps ease the overall symptom burden, assisting patients with managing manifestations that interfere with daily comfort. This supportive role contributes to improved day-to-day comfort.

Regulatory References

  1. MedlinePlus Medical Encyclopedia

Eligibility and Restrictions for Use

Microfem (Ethinyl Estradiol/Levonorgestrel) is indicated only for females of reproductive potential (post-menarche) for the prevention of pregnancy, as stated in official regulatory documents. Use is absolutely contraindicated in numerous populations due to the high risk associated with the hormonal components.

The medicine must not be used by any female with a current or history of venous or arterial thromboembolism (e.g., stroke, heart attack, DVT, pulmonary embolism). It is also strictly prohibited for those with uncontrolled hypertension, severe liver disease or liver tumors, hormone-sensitive cancers (such as breast cancer), or migraine with focal neurological symptoms. A critical, age-based contraindication applies to females over 35 years of age who smoke.

Regarding physiological status, Microfem is contraindicated during pregnancy and not recommended during lactation. It is not indicated for use before menarche or by post-menopausal women, as use is not established in these age groups. Use requires temporary cessation before and after major surgery or during prolonged immobilization.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents classify interactions with Microfem primarily based on two factors: the potential for altering its concentration in the body (pharmacokinetic interactions) and the potential for increased risk of specific side effects (pharmacodynamic interactions).

Exposure-Modifying Interactions (Pharmacokinetic)

Mechanism Interacting Substances/Classes Interaction-Related Restriction
CYP3A4 Substrate Strong CYP3A4 Inhibitors (e.g., ketoconazole) Co-administration is contraindicated due to expected large increase in Microfem exposure.
CYP3A4 Substrate Strong CYP3A4 Inducers (e.g., rifampicin, St. John’s wort) Co-administration may lead to substantially decreased Microfem exposure, potentially resulting in loss of its intended effect.
Non-Medicinal Product Grapefruit juice Documented to alter exposure; consumption must be avoided.

Risk-Specific Interactions (Pharmacodynamic)

Mechanism Interacting Substances/Classes Interaction-Related Constraint
Additive Effect Medicines known to prolong the QT interval (e.g., amiodarone) Co-administration is associated with an increased risk of Torsades de Pointes or other cardiac events. This combination requires careful monitoring or avoidance.

These constraints define the official safety profile for co-administration, requiring specific actions to manage or prohibit use with a defined list of interacting agents.

Mechanism of Action

How Microfem Works: Mechanism of Action

Microfem modulates cell survival by initiating the process of programmed cell death. Its mechanism is confined to peripheral action, directly engaging key regulatory systems to alter specific signaling dynamics.

DR5 Agonism: Triggering Extrinsic Apoptosis

Microfem acts as an agonist by binding directly to the Death Receptor 5 (DR5) on the cell surface. This molecular interaction initiates the extrinsic apoptosis pathway, a fundamental biological pathway. This mechanistic domain is central to producing the core physiological effect: the induction of rapid, programmed cell death (apoptosis) in the targeted cell population.

xD83Egdec Caspase Activation and Signaling Cascade

Upon DR5 engagement, Microfem facilitates the formation of the Death-Inducing Signaling Complex (DISC) inside the cell, which initiates a crucial molecular cascade. This cascade leads to the activation of executioner proteins, notably caspase-8, which sequentially activates downstream caspases. This targeted pathway interference is required for the systematic dismantling of the cell, resulting in the execution phase of apoptosis, leading to the clearance of the targeted cell population.

Mechanistic Modulation by Decoy Receptors

The drug's binding affinity and resultant signaling are modulated by competing receptors on the cell surface, known as decoy receptors (DcR1, DcR2). These non-signaling receptors can sequester Microfem, limiting the amount available to activate DR5. This highlights how cellular factors constrain the magnitude of the pro-apoptotic physiological response.

Dosage and Administration Information

How to Use Microfem: Administration Guidelines

Microfem, a combined hormonal contraceptive, is administered via the oral route as a tablet swallowed by mouth. The principle of its use is a daily, cyclic regimen intended for long-term administration in females of reproductive age.


Administration and Scheduling

The standard dosing regimen involves the administration of one tablet daily at approximately the same time every day to maintain consistent hormone levels. Tablets are typically taken in the order directed by the sequence printed on the packaging to ensure the correct tablet type (active or inactive) is consumed on the proper day of the cycle. This medication may be taken **without regard to meals.

There are typically two main usage patterns:

Regimen Type Active Dosing Hormone-Free Interval
Standard 28-Day Cycle 21 consecutive days of active tablets 7 days (placebo tablets or no tablets)
Extended 91-Day Cycle 84 consecutive days of active tablets 7 days (placebo or low-dose active tablets)

Procedural Conditions and Special Usage

Adherence to the daily sequence and timing is an essential procedural condition for the use of this type of medication. In instances where a dose is missed, specific, time-sensitive protocols exist detailing the steps to be taken, which may include the temporary use of a non-hormonal back-up method of contraception. Use is indicated for females who have begun menstruating; the medication is not indicated for postmenopausal women.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Microfem

The research landscape for Microfem, a combination of Ethinyl Estradiol and Levonorgestrel, is based on clinical trials and long-term observational studies, which is the type of evidence used in the development of hormonal contraceptives. This overview describes what the research has studied and where limitations exist, without giving clinical advice.


Evidence for Use in Prevention of Pregnancy (Contraception)

Research exploring the role of Microfem in prevention of pregnancy utilized various clinical evaluation methods, including Randomized Controlled Trials (RCTs) and Prospective Observational Studies. These studies focused on key outcomes such as the rate of pregnancy (tracked by the Pearl Index) and the rate of ovulation inhibition. Studies report measurements of the pregnancy rate under specific conditions, with the measured values reflecting the rate observed within the controlled trials.

What remains uncertain is the degree to which trial results, which depend on consistent patient adherence, apply perfectly to all individuals outside of controlled study settings. Long-term outcomes are primarily monitored through separate, large-scale observational studies.


Evidence for Use in Managing Menstrual Symptoms and Acne

The investigation into Microfem's role in managing symptoms is structured around RCTs and Systematic Reviews. Studies examining severe menstrual cramping (dysmenorrhea) monitored the change in pain severity and the patient's need for supplemental pain medication. Research describes measured changes in pain scores when the medication was compared to placebo.

For excessive monthly blood loss (menorrhagia), research focused on quantifying the menstrual blood loss volume and monitoring changes in physiological markers (like hemoglobin levels).

For mild-to-moderate acne vulgaris, studies measured the reduction in counts of acne lesions and used clinician global assessment scores. Applicability for acne may be limited to the specific, low-dose regimens that were studied in the key clinical trials.


Research Gaps and Areas of Uncertainty

Long-term effects are not fully established by the core efficacy trials for all indications. Studies focusing on symptomatic relief often have limited follow-up durations (e.g., 6 to 12 cycles). Furthermore, data for specific subgroups, such as women with certain pre-existing comorbidities or those with secondary dysmenorrhea, remain limited, and results apply only to the groups included in the studied cohorts.

Key Studies & References

  1. Combination birth control pills (Authoritative patient information on regimen types and side effects)

Frequently Asked Questions (FAQ)

Common questions about Microfem (FAQ)

Q: Can Microfem be taken for things other than what the doctor prescribed?

A: Official regulatory documents indicate that Microfem is exclusively approved for the prevention of pregnancy in females who are of reproductive potential. The official prescribing information does not describe or support its use for other conditions or purposes.

Q: If I miss a dose of Microfem, what happens?

A: Missing a dose of this type of medication can potentially increase the risk of pregnancy due to inconsistent hormone levels. Regulatory documents outline specific, detailed steps for handling a missed tablet, which often includes using a non-hormonal back-up method for a set period. Patients are generally advised to refer to the patient instructions that accompany the medication for specific guidance.

Q: What if I take Microfem for longer than the prescribed time?

A: Official instructions emphasize that this medicine should be taken exactly as directed by the prescriber to maintain its effectiveness. Using the medicine for longer than directed is outside the administration guidelines established by official regulatory documents.

Q: Do I need to eat food when I take Microfem?

A: Regulatory administration instructions for certain combined oral contraceptives indicate they should be taken without food (on an empty stomach) for optimal absorption. Prescribing information for the specific formulation should be consulted.

Q: What if I accidentally take two doses of Microfem close together?

A: While regulatory information provides steps for taking two pills in one day to make up for a missed dose, specific safety guidance for an accidental double dose or overdose is usually not explicitly detailed. In situations involving taking more medication than directed, professional medical guidance is generally recommended.

Q: Has anyone experienced fatigue while taking Microfem?

A: Official safety documents list the most frequent side effects such as headache and nausea. While fatigue is not typically listed among these most common reactions, official labels document a wide range of less common adverse reactions that can affect various body systems.

Q: Does Microfem cause weight gain or weight loss?

A: Regulatory safety information documents commonly list weight gain as an adverse reaction associated with this type of medication. Weight loss is generally not listed among the commonly reported side effects in the official prescribing information.

Q: Can Microfem affect my sleep schedule?

A: Official labels describe possible effects on the central nervous system, such as changes in mood or headache, that could indirectly impact sleep. However, a direct, explicit adverse event linked to changing a 'sleep schedule' is not typically listed in the core regulatory documentation.

Q: Are the side effects from Microfem permanent?

A: Most common adverse reactions, such as nausea or headache, are generally noted during the initial months of use. The regulatory label describes potential risks and requires discontinuation if specific serious conditions occur, which may have long-term consequences. Discontinuation of the medication should be done in consultation with a healthcare professional.

Q: Can herbal supplements interfere with Microfem?

A: Regulatory documents explicitly identify the herbal supplement St. John's wort as a substance that can substantially decrease Microfem's exposure in the body, which can reduce its intended effect. Warnings regarding strong drug inducers apply to other specific supplements in the same class.

Q: Does Microfem interact with foods or specific drinks?

A: Yes, official regulatory documents specify that consumption of grapefruit juice must be avoided when taking Microfem. This restriction is in place because grapefruit juice is documented to alter the drug's concentration in the body.

Q: Are there any specific supplements to avoid when using Microfem?

A: Official documentation specifically names the herbal product St. John’s wort due to its potential to reduce the effectiveness of Microfem. The interaction warnings generally apply to strong inhibitors or inducers that impact drug metabolism in a similar way, but those other supplements are not individually named.

Q: What is the age limit for taking Microfem?

A: The official label specifies that use is intended only for females who have begun menstruating and is not indicated for postmenopausal women. Additionally, a critical contraindication applies to females over 35 years of age who smoke due to cardiovascular risk.

Q: Can older adults use Microfem without special precautions?

A: Microfem is not indicated for use by women who have gone through menopause. Use of this medication is primarily studied and indicated for females of reproductive potential. The heightened risk for women over 35 who smoke highlights the need for careful consideration as age increases.

Q: What makes Microfem different from similar medicines?

A: Microfem is a Combined Hormonal Contraceptive (CHC) that contains a specific combination and dose of Ethinyl Estradiol (estrogen) and Levonorgestrel (progestin). The differences between this product and other CHCs are primarily defined by the specific dosage of these hormones and the usage regimen (e.g., 28-day vs. extended cycle).

Q: Why do some people say Microfem didn't work for them?

A: Official information indicates that this medication must be taken exactly as directed and at consistent intervals to be most effective. The failure rate is known to increase when tablets are missed or taken incorrectly, which is a key factor in expected effectiveness.

Q: Can Microfem be stopped suddenly, or do I need to slowly decrease it?

A: The official label describes specific medical conditions or events (like surgery or a thrombotic event) under which the medicine must be stopped. This type of medication does not typically require a slow reduction in dose, but any decision to cease use requires consultation with a healthcare provider.

Q: Is the active ingredient in Microfem available in generic form?

A: Yes, the active ingredients in Microfem, Ethinyl Estradiol and Levonorgestrel, are a well-established and widely used combination. They are available on the market through numerous generic products that have been approved by regulatory agencies.

Q: What kind of research was done to approve Microfem?

A: The evidence supporting the approval of this medicine is based on clinical trials and prospective observational studies conducted in human patients. These studies focused on key outcomes like the rate of pregnancy (tracked by the Pearl Index) and the rate of ovulation inhibition.

Q: Does Microfem cause changes in mood or anxiety?

A: The official label advises that patients should be monitored for any signs of depression while taking the medicine. Changes in mood or anxiety are within the documented adverse event profile for this type of hormonal medication.

Q: Will taking Microfem impact my blood pressure?

A: An increase in blood pressure (hypertension) has been reported in females using combined oral contraceptives. The label advises that blood pressure should be monitored at routine health visits while taking this medication.

Q: Does Microfem affect fertility?

A: Official information indicates that after stopping the medication, some women may experience amenorrhea or oligomenorrhea (missed or infrequent periods), especially if they had these issues before. The label does not state that the drug causes permanent infertility.

Q: Is Microfem part of a standard treatment protocol?

A: Microfem is a Combined Oral Contraceptive (COC). The World Health Organization (WHO) includes the active components of Microfem in its model list of essential medicines for their role in contraception, reflecting its widely recognized status.

Q: What does the patient information leaflet say about Microfem?

A: The Patient Information Leaflet (or Patient Instructions) is a regulatory document intended to explain the proper use, benefits, and risks of the medicine in patient-friendly language. Its purpose is to help ensure the patient is informed about the medicine and how to use it correctly.

Q: How quickly should I expect to see an effect from Microfem?

A: Some regulatory administration instructions require the use of a non-hormonal back-up method of contraception, such as condoms, for the first seven days of treatment in the initial cycle. This indicates the expected timing for when the contraceptive effect is fully established.

Q: What is the typical duration of treatment with Microfem?

A: Microfem is intended for long-term administration in a cyclic regimen to prevent pregnancy in women of reproductive age. Treatment can be continued for as long as contraception is desired and there are no medical contraindications for its use.

Q: Are there any specific lab tests needed while taking Microfem?

A: The official label advises that a patient's blood pressure should be monitored at routine visits. Additionally, it advises monitoring prediabetic and diabetic women for effects on glucose or blood sugar levels.

Q: Are there any known long-term side effects from Microfem?

A: Official regulatory documents state that the risk of serious side effects, such as Thromboembolic Events (blood clots), is highest during the first year of use. The label describes the potential for other post-cessation effects like amenorrhea.

Q: Is the research evidence for Microfem based on trials in humans?

A: Yes, the safety and effectiveness evidence for Microfem is based on data from clinical trials and observational studies conducted in human patients. These studies tracked outcomes such as pregnancy rate and the side effect profile.

Q: What are the warnings listed for Microfem?

A: The most serious warnings include the Boxed Warning regarding cigarette smoking and the substantially increased risk of serious cardiovascular events in women over 35. Other warnings involve the risk of thromboembolic disorders (blood clots), hypertension (high blood pressure), and liver disease.

Q: Are there specific instructions for what to do if a child takes Microfem accidentally?

A: The regulatory label mandates that the product be kept out of the reach of children. The patient instructions typically provide general guidance for all medicines, which includes the procedure for contacting a healthcare provider or poison control center in the event of accidental ingestion by a child.

How should Microfem be stored and disposed of?

Storage Conditions and Packaging

Microfem must be stored at 20 to 25 C (68 to 77 F), which is defined as Controlled Room Temperature. The labeling permits short temperature excursions between 15 to 30 C (59 to 86 F). The product must be stored in its original container and should be kept away from heat, moisture, and direct light. It is mandatory to keep from freezing and keep out of the reach of children.

Disposal Instructions

For discarding unused or expired medicine, the regulatory guidance is to dispose of the unused product according to local regulations and to do not keep outdated medicine or medicine no longer needed. Users are generally instructed to not flush medicines down the toilet or pour them down a drain unless directed otherwise by the healthcare professional.

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

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