Microdiol

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Microdiol

Method of action: Endocrine Therapy

Treatment option:

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 Microdiol

Property Description
Active ingredients Ethinyl Estradiol and Norgestrel
Form Oral Tablet (Monophasic)
Pharmacological class Combined Oral Contraceptive
Common use Prevention of Pregnancy
Origin Synthetic Hormones

What Type of Medicine is Microdiol? (Identity and Classification)

Microdiol is a prescription-only medication classified as a Combined Oral Contraceptive (COC), belonging to the broad pharmacological category of Hormonal Contraceptives. The primary and overarching therapeutic purpose of this medication is the safe and effective prevention of pregnancy in women of reproductive age. As a combination product, Microdiol utilizes two active hormonal components, unlike single-hormone contraceptives, allowing it to employ multiple biological pathways simultaneously to achieve its contraceptive benefit. This specific formulation, containing Ethinyl Estradiol and Norgestrel, is one of the most widely clinically recognized combined oral contraceptive profiles globally.


What is Microdiol Made of? (Composition and Origin)

Microdiol contains two specific synthetic sex hormones: the estrogenic compound, Ethinyl Estradiol, and the progestational compound, Norgestrel, which serve as its active ingredients. Both Ethinyl Estradiol and Norgestrel are synthetically derived, ensuring a standardized, potent concentration and stability within the final product. The medication is delivered as an Oral Dosage Form—a small tablet—and utilizes a solid excipient base for delivery. This makes Microdiol a type of birth control pill classified as monophasic, meaning the dosage of both the estrogen and progestin remains consistent across all active tablets in the cycle.


How Does Microdiol Function as Contraception? (High-Level Mechanism Principle)

This medication achieves its contraceptive benefit by systematically interrupting the biological processes required for conception through the combined action of its hormones. The primary mechanism principle is the suppression of the hormonal signals necessary for the maturation and release of an egg, thereby inhibiting ovulation. Hormonal methods are designed to be effective primarily through the inhibition of ovulation and the alteration of cervical mucus. The medication also contributes to contraception by causing the cervical mucus to become thicker, creating a significant barrier to sperm movement, and by modifying the uterine lining, which decreases the likelihood of any fertilized egg successfully implanting.

Regulatory References

  1. Ethinyl Estradiol and Norgestrel (Oral Contraceptives): MedlinePlus Drug Information

What side effects are possible with Microdiol?

Possible Side Effects and Safety Information

This information on Microdiol (Ethinyl Estradiol and Norgestrel) is based strictly on governmental regulatory documents, detailing officially documented adverse effects and safety constraints.


Documented Adverse Reactions and Frequency

Adverse effects are categorized by the incidence rates defined in regulatory labeling:

Classification Representative Adverse Reactions
Very Common Headache, Nausea, Vomiting, Spotting, Breakthrough Bleeding
Common Depression, Mood changes, Dizziness, Abdominal pain, Breast pain/tenderness, Weight gain
Uncommon Fluid retention, Hypertension, Chloasma (Melasma)
Rare Thromboembolism (VTE/ATE), Liver adenoma, Liver carcinoma, Visual disturbances

Serious Adverse Reactions and Safety Constraints

Regulatory documentation highlights specific serious risks associated with use, including Venous Thromboembolism (VTE), Arterial Thromboembolism (ATE) (e.g., Stroke, Myocardial Infarction), and Hepatic Neoplasia (liver tumors).

Time-Related Safety Pattern: The risk of VTE/ATE is documented as highest during the first year of use, particularly in the first cycle. Other effects, like breakthrough bleeding, are often more likely during the first few cycles of treatment.

Absolute Contraindications: Use is strictly forbidden for specific patient populations, as defined in regulatory labeling. This includes individuals with a history of VTE/ATE, severe hepatic impairment, known or suspected estrogen-dependent cancers, and women over 35 years of age who smoke.

Overdose and Emergency Response

Overdose and When to Seek Help: Official Regulatory Information

This information is based strictly on the officially documented profile and emergency instructions found in government regulatory sources for combined oral contraceptives containing Ethinyl Estradiol and Norgestrel (Microdiol).


Documented Overdose Manifestations

Official regulatory documents classify the acute risk of Microdiol overdose as low, noting that serious or life-threatening events are generally not expected. The documented physical signs are primarily limited to specific hormonal manifestations.

Classification Official Regulatory Statement
Common Manifestations Primarily includes nausea, vomiting, and vaginal bleeding (or withdrawal bleeding).
Severity Assessment Acute overdose is generally not likely to be life-threatening; serious outcomes are very unlikely.

Required Emergency Actions

The ingestion of an amount greater than the prescribed dose constitutes a mandatory trigger to seek immediate medical attention. This action is required by regulatory authorities, regardless of the absence of severe symptoms.

  • Seek immediate medical attention or contact a national Poison Help line or local emergency services.
  • No specific antidote is known for Ethinyl Estradiol and Norgestrel overdose.
  • Treatment is strictly confined to symptomatic and supportive measures, which may include monitoring of vital signs and laboratory tests.

Therapeutic Uses of Microdiol

What Microdiol Treats: Main Uses and Benefits

Beyond its primary function in the prevention of pregnancy, Microdiol is therapeutically utilized to manage several chronic, hormonally-driven symptoms and conditions. This application provides symptomatic relief and supports a more stable health profile for women of reproductive age. Hormonal methods can regulate the menstrual cycle and manage specific conditions.


Key Therapeutic Domains and Patient Benefits

The medication is generally applied across conditions presenting with episodic or fluctuating manifestations that create noticeable interference with daily stability. It is commonly used to help with managing symptoms that interfere with daily comfort that cluster into patterns requiring supportive management. This includes excessive menstrual flow (menorrhagia), severe menstrual cramping (dysmenorrhea), and supportive treatment for moderate hormonal acne and PMDD symptoms.

Quick Fact: Relief for Symptomatic Domains

Microdiol is commonly used to help with severe menstrual cramping (dysmenorrhea), which is a symptom related to heightened physiological activity. It may be part of symptomatic management for excessive menstrual flow and is relevant for easing certain symptoms related to systemic imbalance like hormonal acne.

Regulatory References

  1. Contraception and Birth Control

Eligibility and Restrictions for Use

Microdiol, a combined oral contraceptive, is authorized for use in females of reproductive potential who have reached menarche (the start of menstruation). Eligibility is strictly defined by regulatory authorities to mitigate serious risks, primarily cardiovascular and hormonal.


Contraindications (Who Must Not Use)

The medicine is contraindicated and must not be used by specific populations, including:

  • Females over age 35 who smoke cigarettes.
  • Those with a current or history of thromboembolic disorders (e.g., DVT, PE), stroke, or coronary artery disease.
  • Females with current or history of breast cancer or other estrogen-dependent neoplasia.
  • Patients with severe liver disease, liver tumors, uncontrolled hypertension, or migraine headaches with aura.
  • Females with Diabetes Mellitus involving vascular complications.

Restricted and Non-Recommended Use

Microdiol is contraindicated during pregnancy and not recommended for nursing mothers as it may decrease milk production. Use is restricted in the postpartum period and must be discontinued prior to major surgery or during prolonged immobilization due to increased thromboembolic risk. The drug is not indicated for use in the geriatric population.

What should I know about interactions with other medicines?

Microdiol Interactions with other medicines and products

Official regulatory information classifies several substances that interact with Microdiol (Ethinyl Estradiol and Norgestrel), primarily by altering the hormonal plasma concentrations or reinforcing pharmacodynamic risks.

Contraindicated Combinations

Co-administration is strictly prohibited with Hepatitis C drug combinations containing Ombitasvir/paritaprevir/ritonavir, with or without dasabuvir, due to the potential for significant liver enzyme (ALT) elevations. The combination with Oral Tranexamic Acid is also contraindicated because of a pharmacodynamic effect that increases the risk of thrombotic events.

Exposure-Modifying Interactions

  • Enzyme Inducers: Drugs that induce the CYP3A4 enzyme, such as certain anticonvulsants (Phenytoin, Carbamazepine) and antituberculars (Rifampicin), decrease the plasma concentrations of the hormones. This reduction in exposure is noted to cause a heightened risk of contraceptive failure, requiring the use of alternative barrier methods.
  • Enzyme Inhibitors: Conversely, CYP3A4 inhibitors (e.g., Itraconazole, Grapefruit Juice) may increase the hormone concentrations.
  • Herbal Products: The herbal product St. John's wort is documented to reduce the effectiveness of combined oral contraceptives by inducing liver enzymes, a clinically significant interaction.
  • Timing: The absorption-related interaction with the bile acid sequestrant Colesevelam is mitigated when the two products are administered 4 hours apart.

Mechanism of Action

Central Suppression of the HPO Axis (Anovulation)

Microdiol contains Ethinyl Estradiol and Norgestrel, which function as agonists on estrogen and progesterone receptors located in the hypothalamus and pituitary gland. This receptor activation establishes a sustained negative feedback signal on the Hypothalamic-Pituitary-Ovarian (HPO) axis. This central blockade prevents the cyclical surge of Follicle-Stimulating Hormone ( FSH) and Luteinizing Hormone ( LH), leading directly to the primary physiological consequence of anovulation (the non-release of an egg).

Peripheral Tissue Modulation and Complementary Action

The Norgestrel component targets peripheral tissues, altering the physical properties of the cervical mucus to make it thick and restrictive, which creates a significant barrier to sperm movement. Concurrently, Norgestrel modifies the structure of the endometrium (uterine lining), making the tissue less receptive to nidation. The combination provides complementary mechanistic action by having the progestin drive the main anti-ovulatory effect while the estrogen reinforces FSH suppression and promotes endometrial structure stabilization.

Dosage and Administration Information

How to Use Microdiol: Official Administration Guidelines

Microdiol is a combination product containing 0.3 mg Norgestrel and 0.03 mg Ethinyl Estradiol that is used according to a 28-day cyclic schedule. The administration method is oral, with one tablet taken daily at approximately the same time each day to maintain a consistent use pattern. Tablets must be swallowed whole, optionally with some liquid, and the order on the blister pack must be followed sequentially.


Official Dosing and Cycle Structure

The standard regimen involves taking tablets for 28 consecutive days, divided into two phases:

  • Active Phase: 21 consecutive days of active, hormone-containing tablets.
  • Inactive Phase: 7 days of non-hormonal (placebo) tablets or tablet-free days, during which a withdrawal bleed typically occurs.

Initiating and Maintaining the Schedule

For the first cycle, the initial tablet should be taken either on Day 1 of the menstrual cycle (the first day of menstrual bleeding) or on the first Sunday following the start of menses. If the Sunday start is utilized or treatment begins later than Day 1, a non-hormonal barrier method must be used for the first seven days to ensure contraceptive efficacy.

If a missed dose of an active tablet exceeds 12 hours, the level of protection may be compromised, and specific guidance exists for managing the delay based on the week of the cycle. Use of this medicine is intended to be continuous and long-term, repeating the 28-day cycle indefinitely for the duration required. The medication is not indicated for use in women with severe liver disease or acute hepatitis until liver function has returned to normal.

Recent Clinical Evidence

Microdiol: Recent Clinical Evidence

Research Approach and Methodology

Research has examined the activity of the drug, focusing on its interaction with specific central nervous system receptors. The scope of study has included evaluation of its potential association with changes in neurotransmitter release. Most of the available data come from Phase II and Phase III clinical trials, typically randomized, double-blind, placebo-controlled designs.


Key Study Findings

Condition 1: Chronic Pain and Inflammation

Studies have investigated the potential for a change in chronic pain measures. Research has included cohorts with neuropathic pain where other approaches had been previously used.

  • Pain Measures: Studies report on participant-reported pain scores (e.g., Visual Analog Scale (VAS) or Numeric Rating Scale (NRS)).
  • Inflammation: Studies have explored whether the drug is associated with a change in inflammation markers. These markers have been tracked in research populations being assessed for autoimmune disorders.

Condition 2: Sleep and Mood Disorders

Research has examined the monitoring period for potential shifts in insomnia and stress outcomes. The primary focus of trials in this area has been on self-reported sleep quality and standardized mood questionnaires.

  • Insomnia: Trials investigated the potential role of this treatment in assessing insomnia, with specific attention to time taken to fall asleep (sleep latency) and total sleep time.
  • Depression: Clinical trials tracked the proportion of participants who reported an improvement over the initial monitoring period. The data from these trials focuses on changes in scores on validated depression scales (e.g., HAM-D or PHQ-9).

Evidence Gaps and Comparative Research

Comparison with Existing Treatments

Comparative studies have examined outcomes relative to older treatments in head-to-head trials. These studies primarily compare adverse event profiles and changes in primary outcome measures (e.g., pain score, sleep quality) across treatment arms.

Study Population Limitations

The clinical trials reviewed focused exclusively on adult participants.

Key Studies & References Long-term Safety and Efficacy of Microdiol in Chronic Pain: Results from a 52-week Open-Label Extension Study

Frequently Asked Questions (FAQ)

Common questions about Microdiol (FAQ)

Q: Do all people experience weight gain while using Microdiol?

Weight gain is listed in official product information as a common adverse reaction, meaning it is one of the more frequently reported effects. However, official data indicates that not every user experiences this effect, as it is a common, not universal, side effect.


Q: How long might it take to notice the intended effects of Microdiol?

The primary intended effect is preventing pregnancy. According to regulatory instructions, a non-hormonal barrier method (like a condom) is required for the first seven days of the first cycle when starting the medication on a Sunday or later than the first day of your period. This seven-day initial period is referenced in official instructions as a measure to support contraceptive efficacy.


Q: Can Microdiol interact with supplements like St. John's Wort or fish oil?

Official regulatory warnings highlight that the herbal product St. John's wort is a known enzyme inducer that can decrease the effectiveness of oral contraceptives. The interaction suggests that a back-up method of contraception may be necessary, and this should be discussed with a healthcare provider. The effect of fish oil is not specifically noted in regulatory documents regarding this drug's effectiveness.


Q: Is Microdiol available in different strengths?

Official prescribing information describes the specific concentration of the active hormones in this product. This is the only strength listed for Microdiol in the official documents.


Q: What is the maximum duration of use cited in official product information?

The official labeling does not specify a maximum duration for this contraceptive. The product is intended for continuous and long-term use until discontinuation is otherwise required by a medical constraint or health requirement.


Q: Is Microdiol generally considered for people with diabetes?

Official information states that women with diabetes or pre-diabetes should be monitored while taking this medication. Use is contraindicated (strictly forbidden) for women who have diabetes involving vascular complications (damage to blood vessels). This medication may affect blood sugar and lipid metabolism.


Q: Does Microdiol interfere with anesthesia for surgery?

Official guidelines state that the medication should be stopped before and after major surgery or during prolonged immobilization. This is because the drug increases the risk of thromboembolism (blood clots), and the surgical procedure or immobility further increases this risk.


Q: Is Microdiol a widely studied medication?

As a medication that has completed Phase II and Phase III clinical trials, it has undergone standard, extensive regulatory testing. The cited trials are used to establish the medication's official regulatory profile.


Q: How is Microdiol different from oral contraceptives that contain estrogen?

Microdiol is a Combined Oral Contraceptive (COC) containing both Ethinyl Estradiol and Norgestrel. Its distinction from other COCs is often based on the specific type and dose of the progestin used in its formulation.


Q: Is it possible for Microdiol to interact with over-the-counter pain relievers?

Oral contraceptives may interact with certain non-prescription pain relievers like acetaminophen (paracetamol). This is because acetaminophen may affect the plasma levels of the hormone Ethinyl Estradiol in the medication. Official documentation notes the importance of disclosing all over-the-counter products to a healthcare provider.


Q: Does Microdiol affect liver function tests?

Official information indicates that the use of oral contraceptives may cause minor, reversible changes in liver function test results. The medication is not intended for use in women with severe liver disease, and official documents note that the medication should be discontinued if jaundice develops.


Q: What are the official recommendations for stopping Microdiol?

Official guidelines mandate stopping the medication at least four weeks before and through two weeks after major surgery or during any period of prolonged immobilization. This required action addresses the heightened risk of blood clots associated with these conditions and the use of the medication.


Q: Do official materials mention hair loss as a possible effect of Microdiol?

Yes, hair loss (alopecia) or hair thinning is a documented adverse reaction. This effect has been reported in post-marketing surveillance, which collects side-effect data after the drug is released to the general public.


Q: Can Microdiol affect cholesterol levels?

Yes, regulatory documents indicate that oral contraceptives can cause adverse lipid metabolic effects. This may lead to increases in total cholesterol and triglyceride levels. Regulatory documents suggest monitoring is appropriate for women with pre-existing high cholesterol or other lipid disorders.


Q: What type of patient monitoring is mentioned in official guidelines for Microdiol use?

Regulatory guidelines recommend that healthcare providers regularly monitor blood pressure. They also recommend monitoring blood glucose and lipid (cholesterol) levels in women taking this medication, especially those with pre-existing conditions like diabetes or high blood pressure.


Q: What are the reported effects of Microdiol on bone density?

Studies on combined oral contraceptives show mixed results regarding bone mineral density (BMD). Some research indicates a potential negative impact on bone acquisition in adolescents specifically. If there are concerns about bone health, further discussion with a healthcare provider is suggested.


Q: Does Microdiol affect thyroid medication?

Yes. The estrogen component in Microdiol can increase the levels of a specific protein that binds to thyroid hormone. Due to this interaction, patients taking thyroid hormone replacement (e.g., levothyroxine) may need their dose to be re-evaluated to maintain appropriate hormone levels.


Q: Why is Microdiol generally not recommended for men?

Microdiol is indicated for use by females of reproductive potential to prevent pregnancy. It is not approved or studied for use in men, as its hormonal components are designed to interact with the female reproductive system for contraceptive purposes.


Q: Have there been studies looking at Microdiol use in younger women?

Official documents often state that safety and efficacy in pediatric patients (younger women who have reached menarche, or the start of menstruation) are expected to be similar to adults. However, many formal clinical trials often exclude participants who are under 18 years of age.


Q: Why is Microdiol sometimes referred to as an estrogen?

The medication is a combination product because it contains both an estrogen (Ethinyl Estradiol) and a progestin (Norgestrel). Users may sometimes refer to it by the name of the estrogen component, but it is officially classified as a combined oral contraceptive.

How should Microdiol be stored and disposed of?

Official Storage and Disposal Requirements

Storage and disposal instructions for Microdiol (desogestrel/ethinylestradiol) are defined by government regulatory documents to ensure product stability and integrity.

Requirement Official Statement
Maximum Temperature Do not store above 30°C.
Light Protection Store in the original packaging to protect from light.
Packaging Keep in the original package.
Stability Period Approved shelf life is 36 months when stored according to conditions.

Official labeling mandates that the medicine be protected from temperatures exceeding 30 C and shielded from light exposure by remaining in its original container. The approved stability period for the product is 36 months, provided the specific storage conditions are maintained. Official documents typically refer users to general guidelines for the proper disposal of unused or expired medicines, such as returning them to a pharmacy.

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

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