Menoral

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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 Menoral

What is Menoral? (Norethisterone)

Property Description
Active ingredient Norethisterone (Norethindrone)
Form Tablet (oral administration)
Pharmacological class Progestogen (Synthetic Progestin)
Common use Hormonal balance and menstrual cycle regulation
Origin Synthetic (19-Nortestosterone-derived)

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

Menoral is a pharmaceutical agent defined by its active compound, Norethisterone (INN), also known as Norethindrone. It is classified as a progestogen, a powerful synthetic hormone that fundamentally mimics the effects of natural progesterone. Norethisterone belongs to the therapeutic class of Female Sex Hormones and is specifically a synthetic derivative from the 19-Nortestosterone-derived class.

As a prescription-only drug, the identity of Menoral is centered on providing targeted progestational effects. The active substance Norethisterone is used in hormonal regulation and is classified as a progestogen used systemically. The medicine is established and clinically recognized for regulating complex hormonal conditions within the body.


Norethisterone: Composition, Form, and Origin

The core composition of Menoral consists of Norethisterone as the sole active ingredient, typically presented as a tablet for convenient oral administration. Norethisterone is strictly of synthetic origin, chemically designed for specific hormonal activity and superior oral bioavailability when compared to natural progesterone. While Menoral is a commercial trade name, the substance Norethisterone is globally recognized. The focus on a single active ingredient ensures the patient receives only the concentrated hormonal action of the progestogen, which is a differentiating feature from combination pills.


What is the General Purpose of Norethisterone? (High-Level Function)

The general purpose of Norethisterone is to regulate and stabilize the hormonal environment, particularly the inner lining of the womb (endometrium). It achieves this by exerting a strong progestational action, which helps to control the cyclical changes associated with menstruation. Progestins like Norethisterone play a role in stabilizing the endometrial lining, which is central to managing menstrual disorders. The medication's primary function is to help stabilize the womb lining and bring balance to the reproductive cycle. Furthermore, its biological effects include a degree of ovulation suppression, making it a versatile tool for specialized hormonal management.

Regulatory References

  1. Norethisterone

What side effects are possible with Menoral?

Possible Side Effects and Safety Information

The safety profile for Norethisterone (Menoral) is structurally defined by regulatory documentation, which categorizes adverse reactions by frequency and organ system. Officially, irregular uterine bleeding (including breakthrough bleeding or spotting) is classified as a very common effect, often noted during the initial phase of treatment. Other common adverse reactions documented in regulatory sources include headache, nausea, mastodynia (breast pain/tenderness), and weight gain.


Adverse effects are grouped into System-Organ Classes (SOC), involving the Reproductive System, Nervous System, Gastrointestinal Tract, and Vascular System. The label highlights several Serious Adverse Reactions, which, though less common, are subject to prominent warnings. These include the potential for thrombo-embolic disorders (such as pulmonary embolism or deep vein thrombosis) and hepatic neoplasia (liver tumors).


Safety Restrictions and Contraindications strictly limit the use of this medicine. It is prohibited for patients with a current or history of thromboembolic disease, known or suspected breast carcinoma, acute or severe liver disease, or undiagnosed abnormal genital bleeding. Furthermore, regulatory notes require caution for special populations, including patients with conditions aggravated by fluid retention (e.g., epilepsy, cardiac dysfunction) and those with vascular risk factors.

Overdose and Emergency Response

Overdose and When to Seek Help

This section outlines the officially documented signs and required emergency actions for an overdose of Menoral (Norethisterone) as stated in government regulatory labeling.


Documented Overdose Manifestations

Official prescribing information notes that overdosage with Norethisterone may be manifested by a cluster of clinical signs. These commonly include nausea and vomiting. Further documented presentations are breast enlargement and, later, vaginal bleeding (often referred to as withdrawal bleeding).

Severity and Required Emergency Action

Regulatory assessments classify the acute toxicity of Norethisterone as generally very low following single-agent ingestion. Despite the low toxicity profile, immediate medical attention must be sought if an overdose is suspected or if symptomatic manifestations occur. Treatment of overdose is strictly symptomatic and supportive, as no specific antidote is known.

Procedural Management

Specific procedural interventions are mandated under certain constraints. Gastric lavage may be employed if the overdosage is confirmed to be large and the affected individual is seen within four hours of ingestion. The primary initial step in all cases is the discontinuation of the medicine.

Therapeutic Uses of Menoral

Menoral: Therapeutic Domains and Benefits

Menoral, containing the progestin norethisterone, is indicated for addressing a range of gynecological conditions and menstrual cycle irregularities. It is used in the management of dysfunctional uterine bleeding (DUB), which involves irregular or heavy uterine bleeding not linked to organic causes. The therapy is intended to help re-establish a typical menstrual cycle pattern in affected individuals.

The medication also provides support for conditions such as menorrhagia (abnormally heavy menstrual blood loss) and is utilized in the care of premenstrual syndrome (PMS), where it can contribute to the relief of associated cyclical symptoms. In the context of endometriosis, Menoral is employed as part of a therapeutic approach to manage the condition. Additionally, healthcare professionals may prescribe this medication for the temporary adjustment of the timing of menstruation.

Quick Facts

  • Helps manage dysfunctional uterine bleeding.
  • Provides support for menorrhagia.
  • Used in the care of premenstrual syndrome (PMS).
  • Intended for the management of endometriosis.
  • May be used to adjust the timing of menstruation.

Eligibility and Restrictions for Use

Eligibility and Contraindications

Menoral (Norethisterone) eligibility is strictly defined by regulatory criteria, specifying absolute prohibitions and populations requiring careful monitoring. The medicine is generally indicated for females of reproductive potential, specifically after menarche, and typically not indicated after menopause for menstrual cycle management.

Use is contraindicated in cases of known or suspected pregnancy and is generally not recommended for women who are breastfeeding. Absolute prohibitions include a history of or current thromboembolic disorders (such as DVT or stroke), severe hepatic disease, liver tumors, and any known or suspected hormone-sensitive malignancy, such as breast cancer. The medicine must not be used by patients with undiagnosed abnormal uterine bleeding.

Restricted Use and Special Caution:

Patients with conditions influenced by fluid retention, such as renal dysfunction or cardiac dysfunction, require careful observation during therapy. Close monitoring is also necessary for individuals with non-vascular diabetes mellitus or hyperlipidemias, as documented in regulatory labeling. This structure ensures that population restrictions are clearly established before use.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Norethisterone’s official interaction profile is defined primarily by modifications to its systemic concentration resulting from documented changes to its hepatic metabolism.

Metabolic and Exposure Interactions

Co-administration with substances that are CYP3A4 enzyme inducers is documented to increase the clearance of Norethisterone, leading to reduced systemic exposure. Medicines in this category include certain anticonvulsants (e.g., Phenytoin, Carbamazepine) and antibiotics (e.g., Rifampicin). Conversely, documented CYP3A4 inhibitors (e.g., Ketoconazole) may reduce the drug’s clearance, resulting in increased systemic concentrations. The herbal product St. John’s Wort (Hypericum perforatum) is also officially noted as an enzyme inducer that may decrease Norethisterone exposure. Certain food substances, such as Grapefruit juice, are also noted for their CYP3A4 inhibitory potential.

Non-Metabolic and Timing Constraints

Interactions involving non-metabolic interference are documented. Norethisterone must be administered at least 4 hours before Colesevelam to prevent decreased absorption due to drug binding in the gastrointestinal tract. Furthermore, regulatory documents state that Norethisterone may decrease the plasma concentrations of co-administered medicines, such as Lamotrigine. Due to the critical role of the liver in drug clearance, the use of Norethisterone is formally contraindicated in patients with severe hepatic impairment, as this condition alters the drug’s metabolic and interaction profile.

Mechanism of Action

Menoral is a non-steroidal compound that functions as a selective beta-estrogen receptor modulator ( SERM- beta). Its pharmacodynamic action is centered on binding to the Estrogen Receptor- beta ( ER-beta) expressed primarily in the bone microenvironment, specifically on osteoclast precursors and osteoblasts.

Targeting osteoclast precursors, Menoral’s ER-beta binding modulates the NF-kappa B signaling pathway, which is critical for cellular maturation. This modification inhibits the terminal differentiation and subsequent activation of osteoclasts. Simultaneously, in osteoblasts, ER-beta activation increases the expression of the decoy receptor osteoprotegerin ( OPG).

The convergence of these two cellular actions results in a net increase in the OPG/ RANKL ratio. This modulation of key paracrine factors ultimately shifts the cellular balance toward a state of reduced osteoclastogenesis.

Dosage and Administration Information

Administration Guidelines for Menoral (Norethisterone)

Menoral, containing norethisterone, is administered as a tablet via the oral route only. Usage instructions vary significantly based on the dose strength and the therapeutic goal, requiring strict adherence to the defined schedule.

Usage Goal Standard Dosing Regimen Duration & Timing
Abnormal Uterine Bleeding 2.5 mg to 10 mg daily (divided doses) Taken for 5 to 10 days.
Endometriosis Starts at 5 mg daily, may be increased by 2.5 mg every 2 weeks, up to a maximum of 15 mg to 25 mg daily. Continuous treatment for 6 to 9 months; dose is adjusted back if breakthrough bleeding stops.
Menstruation Postponement 5 mg two to three times daily Therapy begins 3 days before expected menses and is limited to a maximum of 10 to 14 days.

Procedural Instructions

All tablets should be swallowed whole with liquid and may be taken with or without food. For the continuous 0.35 mg contraceptive dose, the pill must be taken at the same time each day; missing a dose by more than three hours requires taking the missed pill immediately and using a non-hormonal barrier method for the subsequent 48 hours. Use is not recommended in children prior to menarche. The precise dosing, frequency, and duration are fully dictated by the specific prescribed regimen.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Menoral (Norethisterone)


Evidence for the Management of Abnormal Uterine Bleeding

Research was studied for Norethisterone's role in managing conditions characterized by fluctuating or episodic manifestations, such as abnormal uterine bleeding (AUB) and heavy menstrual bleeding. The evidence includes systematic reviews and randomized controlled trials (RCTs), often comparing Norethisterone to other active treatments or control groups. Studies research examined outcomes related to systemic or functional imbalance, such as outcomes related to achieving cycle regularity and the quantification of menstrual blood loss.

Studies report how symptoms evolved in the observed populations, with patterns related to bleeding cessation was observed in the short term. However, evidence quality varies across studies, as the evidence base contains many older trials, and recent, high-quality RCTs comparing Norethisterone directly to a placebo is limited.

Evidence for the Management of Endometriosis

Norethisterone was evaluated in studies focused on endometriosis, a condition marked by functional limitations. Research for this application included randomized trials, sometimes comparing Norethisterone against other hormone therapies. These studies applied in research contexts involving fluctuating or unstable symptoms and primarily research examined patient-reported outcomes describing perceived discomfort, such as the severity of chronic pelvic pain.

Studies report how symptoms evolved in the observed populations over study periods, and measurements related to pain intensity was observed in some studies. What remains uncertain includes the precise long-term status of the condition, as there is limited information for long-term outcomes regarding disease recurrence years after treatment is stopped.

Evidence for Temporary Menstrual Timing Adjustment

This specific application was studied for by research examining temporary physiological imbalance. Evidence primarily stems from clinical experience, observational studies, and data accepted by regulatory bodies. Research explored the outcomes describing episodic or acute changes by exploring the temporary delay of the menstrual period for the duration of the administration.

The data show patterns related to temporary cycle postponement in generally healthy women, consistent with the known effects studied in this context. What remains uncertain is that this application is primarily supported by observational data and clinical experience, and evidence remains limited from large-scale, long-term RCTs.

Frequently Asked Questions (FAQ)

Common questions about Menoral (FAQ)

Q: Is Menoral the same type of medicine as [similar common drug]?

A: Menoral is identified in official documents by its active ingredient, Norethisterone, which is classified as a progestogen. This means it is a type of synthetic hormone that works in the body similarly to natural progesterone, helping to regulate hormonal balance.

Q: Why does Menoral have a Black Box Warning on the label?

A: Regulatory documents require prominent warnings for potential Serious Adverse Reactions. These include risks related to thrombo-embolic disorders (such as blood clots) and hepatic neoplasia (liver tumors). These serious, though rare, potentials are highlighted so patients and prescribers are fully aware of the safety profile.

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

A: According to official safety information, the very common effect is irregular uterine bleeding, which includes spotting or breakthrough bleeding. Other effects reported as common include headache, nausea, mastodynia (breast pain/tenderness), and weight gain.

Q: Does Menoral cause weight gain or weight loss?

A: Regulatory safety information lists weight gain as a common adverse reaction associated with the use of the medicine. Official documentation does not typically classify weight loss as a reported adverse effect.

Q: Are the initial side effects of Menoral temporary?

A: Official safety information notes that irregular uterine bleeding is often observed during the initial phase of treatment. The notation that this effect is often seen during the initial phase may suggest that this specific effect is observed less frequently later in treatment.

Q: Can Menoral affect blood pressure or heart rate?

A: Regulatory notes advise caution for people with conditions that may be made worse by fluid retention, such as cardiac dysfunction (heart-related problems). Some safety documentation indicates a potential for increased blood pressure or worsening of heart-related conditions.

Q: How does Menoral interact with grapefruit juice or products?

A: Grapefruit juice is documented in regulatory guidelines as a substance that may reduce the clearance of the active ingredient from the body. This potential reduction in clearance could lead to increased systemic concentrations of the medicine.

Q: Can I take other prescription medications while using Menoral?

A: Official regulatory documents identify several classes of medicines that can affect the concentration of Norethisterone in the body. These include strong CYP3A4 inducers, such as certain antibiotics and anticonvulsants. Regulatory guidance requires patients to inform their prescriber about all other medicines being taken.

Q: Can Menoral be cut or crushed to make it easier to swallow?

A: Official administration guidelines state that tablets should be swallowed whole with liquid and do not include instructions for crushing, cutting, or altering the tablet.

Q: How long after starting Menoral can I expect to notice anything?

A: Official pharmacological data indicates the medicine is rapidly absorbed, with peak concentrations typically occurring within one to two hours after administration. For conditions like abnormal uterine bleeding, patterns related to the stopping of bleeding have been reported within the first week of treatment.

Q: What happens if I stop taking Menoral suddenly?

A: When the medicine is used for the specific purpose of temporary postponement of menstruation, bleeding typically resumes within two to four days after the medicine is stopped, according to official usage guidelines.

Q: Is Menoral known to affect mood or cause anxiety?

A: Regulatory safety documents note that mood alterations are a recognized adverse reaction. In clinical trials, reports have included instances of depression and anxiety in a small percentage of users.

Q: Is there a generic version of Menoral available?

A: Yes, the active ingredient in Menoral is Norethisterone (also known as Norethindrone). This substance is widely available under its generic name as well as various other trade names, as recognized by regulatory bodies globally.

Q: Is Menoral a short-term or long-term medication?

A: The medicine is prescribed for both short-term and long-term regimens, depending on the condition being addressed. Official schedules range from as short as 5 to 10 days for certain bleeding issues to continuous treatment for up to 6 to 9 months for conditions like endometriosis.

Q: Does Menoral affect kidney function or liver function?

A: The medicine is contraindicated (prohibited) for patients with severe hepatic (liver) impairment, as the liver is critical for drug clearance. Regulatory notes also require careful monitoring for patients with existing renal (kidney) dysfunction.

Q: Is Menoral a controlled substance?

A: Norethisterone, the active ingredient in Menoral, is generally not classified as a controlled substance under government drug scheduling acts.

Q: Are there different strengths of Menoral available?

A: Yes, the active ingredient is available in different strengths tailored to the prescribed condition. These include a 0.35 mg strength used for contraception and tablets ranging from 2.5 mg to 10 mg for other therapeutic uses.

Q: What should I do if I miss a dose of Menoral?

A: For the 0.35 mg contraceptive dose, official guidance specifies that if the pill is missed by more than three hours, the patient should take the missed pill as soon as possible and use a non-hormonal barrier method for the subsequent 48 hours.

Q: Can Menoral cause allergic reactions?

A: Official safety documentation confirms that allergic reactions are a potential adverse effect. Documented symptoms may include skin rash, itching, hives, or swelling of the face, lips, tongue, or throat.

Q: How long does Menoral stay in your system after stopping it?

A: Official pharmacological data estimates the mean terminal elimination half-life of the active ingredient to be approximately 8 hours after a single dose. This is the time it takes for half of the medicine to be removed from the body.

Q: Is Menoral known to cause problems with eyesight?

A: Official safety precautions advise seeking medical attention immediately if blurred vision, difficulty with reading, or any other change in vision occurs during or after treatment.

Q: Has Menoral been studied in children or adolescents?

A: While the medicine is generally not recommended for children prior to menarche (onset of menstruation), regulatory-backed clinical studies have been conducted to evaluate the use of Norethisterone-containing regimens in adolescents for certain conditions like endometriosis.

Q: Is Menoral ever used in men?

A: The formal regulatory indications for Menoral (Norethisterone tablets) are for conditions related to female hormonal balance. However, the drug and its related forms have been examined in research settings for potential applications in men, such as in the context of hormonal contraception studies.

Q: Is Menoral safe for people with a history of heart issues?

A: Use is prohibited (contraindicated) for patients with a current or history of thromboembolic disorders (blood clots, stroke). Regulatory safety guidelines also require caution and careful monitoring for individuals with existing cardiac dysfunction or other vascular risk factors.

Q: Can Menoral cause problems with sleep or insomnia?

A: Official safety documentation indicates that sleep disturbances are recognized adverse reactions. These disturbances may include feelings of fatigue or trouble sleeping, known as insomnia.

Q: Does Menoral work differently for different people?

A: Official documents recognize that treatment effectiveness for certain conditions, such as abnormal uterine bleeding, may be adjusted based on the individual patient's response to the medicine. This variation in response is accounted for in prescribing guidance.

How should Menoral be stored and disposed of?

How to Store and Dispose of Menoral (Norethisterone)

Official regulatory labeling dictates specific conditions for storing and handling Menoral tablets to maintain stability and effectiveness.


Storage and Stability

Requirement Details
Temperature Store at a temperature not exceeding 25°C (room temperature).
Packaging Must be kept in the original package for protection from light and moisture.
Shelf-Life The labeled shelf-life is five years when stored under the specified conditions.
Child Safety Store the medicine out of the sight and reach of children.

Disposal Instructions

When disposing of unused or expired Menoral, follow official government guidelines.

  • Disposal should be done through an authorized drug take-back program or community disposal box.
  • If a take-back program is unavailable, the medicine should be mixed with an unpalatable substance (like used coffee grounds) and placed in a sealed container before discarding in the household trash.
  • The tablets must not be flushed down a toilet or poured down a sink unless explicitly directed by regulatory authorities.

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

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