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Norethisterone Actavis

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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.

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Overview of Norethisterone Actavis

Property Description
Active ingredient Norethisterone (Norethisteron)
Form Tablets (Oral)
Pharmacological class Progestogen (Synthetic Sex Hormone)
Common use Hormonal regulation and stabilization
Origin Synthetic (19-nortestosterone derivative)

Norethisterone Actavis is a specific, single-entity pharmaceutical preparation containing the synthetic hormone Norethisterone as its active ingredient. The medication is exclusively supplied in the form of tablets designed for oral administration. Its formulation is clinically recognized for providing a consistent and stable delivery of the active compound, which is derived from the 19-nortestosterone structure.


Identity and Classification: What Type of Medicine is Norethisterone Actavis?

Norethisterone Actavis is a hormonal medication belonging to the progestogen class. The active substance, Norethisterone (also known as Norethindrone or Norethisteron), is a steroid of entirely synthetic origin. This single-entity tablet formulation is a key differentiating factor, focusing solely on the progestogenic effect, unlike combination hormonal regimens. Its use is limited to prescription-only status (Rx).


General Purpose and Action Summary

The fundamental purpose of Norethisterone is to mimic and amplify the natural progestational effect within the body. This action is effective in the regulation and stabilization of hormonal balance. By providing this controlled, predictable hormonal influence, the medication is generally used to manage cyclical changes and correct underlying hormonal imbalances that primarily affect the female reproductive system.

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What side effects are possible with Norethisterone Actavis?

Possible Side Effects and Safety Information

The safety profile of Norethisterone Actavis is categorized and documented according to official regulatory standards, such as those used by the European Medicines Agency (EMA) and the U.S. Food and Drug Administration (FDA). Adverse effects are classified by frequency and grouped by the body systems they affect, strictly avoiding clinical advice or therapeutic claims.


Adverse Reaction Frequencies

The most commonly listed adverse effects are those related to hormonal fluctuations, while other reactions are generally less frequent:

  • Very Common (Affecting more than 1 in 10 users): Uterine bleeding/spotting.
  • Common (Affecting 1 to 10 in 100 users): Headache, Nausea, Dizziness, Weight change, Oedema (fluid retention), and Breast tenderness.
  • Uncommon to Rare: Reactions such as Amenorrhoea, Rash, Pruritus, Hypersensitivity reactions, and Clinically Significant Events.

Safety Considerations and Serious Risks

Official labeling addresses specific population safety constraints and serious adverse reactions. The medicine must not be used in individuals with a history of thromboembolic disorders or severe hepatic dysfunction, as these conditions are formal contraindications.

Serious Adverse Reactions formally documented include Thromboembolic Events (e.g., Deep Vein Thrombosis or Pulmonary Embolism), which are classified as rare, and Severe Hepatic Dysfunction (e.g., Jaundice, Hepatitis). The regulatory documents note that uterine bleeding irregularities are often most frequent at the start of treatment, while the risk of certain serious vascular events may be associated with long-term exposure.

Safety notes also exist for patients with pre-existing Diabetes or a history of Migraine aggravation.

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Overdose and Emergency Response

Overdose and when to seek help

Official regulatory documents classify the acute toxicity of Norethisterone as very low. Despite this, individuals should seek immediate medical attention or contact their doctor straight away if they suspect an overdosage.


Documented Overdose Manifestations

Overdosage with Norethisterone Actavis may present with several non-life-threatening clinical signs, primarily involving hormonal and gastrointestinal systems:

  • Nausea
  • Vomiting
  • Breast enlargement
  • Vaginal bleeding (may manifest as a delayed sign)

Official Emergency Management Statements

Management Aspect Regulatory Statement
Antidote Availability No specific antidote is known for Norethisterone overdose.
Treatment Focus Treatment must be strictly symptomatic and supportive.
Procedural Constraint Gastric lavage may be considered for a large overdosage only if the patient is seen within four hours of ingestion.

This profile dictates that while severe outcomes are not formally documented, urgent medical assessment is required to manage documented symptoms and evaluate the applicability of time-constrained interventions, such as gastric lavage.

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Therapeutic Uses of Norethisterone Actavis

What Norethisterone Actavis Treats: Main Uses and Benefits

The medicine's use is relevant to the management of gynaecological symptoms. Norethisterone is commonly used across a range of therapeutic domains that involve conditions characterized by periods of heightened symptoms related to the menstrual cycle. It is applied in addressing various symptoms that interfere with daily functioning, including Menorrhagia (heavy periods), Dysmenorrhoea (painful periods), Endometriosis, Premenstrual syndrome (PMS), and Abnormal uterine bleeding due to hormonal imbalance.

For acute scenarios, Norethisterone is also used for the postponement of menstruation. It supports patients during episodes of heightened discomfort and may assist with maintaining functional stability. By providing support that helps ease the overall symptom burden, it may help patients cope with symptom fluctuations.

Quick Fact: Is commonly used to help with symptoms related to physical discomfort

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Eligibility and Restrictions for Use

Official Eligibility Rules for Norethisterone Actavis

Regulatory authorities define eligibility for Norethisterone Actavis strictly based on patient health status and age, primarily permitting its use in adult menstruating females who are free from specific health contraindications.

Absolute Contraindications (Must Not Use)

This medication is strictly contraindicated and must not be used in individuals with the following official regulatory exclusions:

Contraindicated Status Population or Condition
Prohibited Pregnancy (known or suspected)
Prohibited History of thrombotic or thromboembolic disorders (e.g., DVT, stroke, heart attack)
Prohibited Severe hepatic disease or liver tumors
Prohibited Known or suspected sex hormone-dependent malignancies (e.g., breast cancer)
Prohibited Undiagnosed abnormal uterine bleeding

Restricted and Age-Related Use

Population Group Regulatory Classification
Lactation/Breastfeeding Contraindicated or Not Recommended
Pediatric (Children) Not intended for use / Not recommended (premenarcheal)
Geriatric (Older Adults) Not recommended (Insufficient data)
Renal/Cardiac Dysfunction Conditional use (Requires careful observation due to fluid retention risk)

Eligibility is defined by the absence of these life-limiting risks and the patient's status as a female of reproductive age. The regulatory profile requires close monitoring for patients with conditions such as epilepsy, non-focal migraine, or severe obesity, which may require discontinuation.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Norethisterone Actavis is primarily defined by documented effects on drug metabolism, resulting in reduced or altered exposure. Co-administration with agents known to induce Cytochrome P450 (CYP) enzymes may increase the metabolism of Norethisterone, leading to a reduction in Norethisterone plasma levels. These enzyme-inducing medicines include the anticonvulsants Phenytoin and Carbamazepine, as well as anti-infectives such as Rifampicin and certain Tetracyclines.


Key Interaction Classifications

Interaction Type Interacting Substance(s) Official Constraint or Outcome
Contraindicated Combination Mifepristone Formally designated as a prohibited combination.
Metabolic Induction St John's wort (Hypericum perforatum), Aminoglutethimide May lead to reduced Norethisterone exposure.
Pharmacodynamic Additive Effect NSAIDs, Vasodilators Requires special care due to documented risk of additive fluid retention.

Additionally, co-administration with Cyclosporin has been officially reported to lead to increased plasma cyclosporin levels and/or decreased Norethisterone levels. Use with anticoagulants requires careful consideration based on the official regulatory documentation.

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Mechanism of Action

Direct Receptor Agonism and Endometrial Stability

Norethisterone primarily acts as an agonist (activator) of the Progesterone Receptor (PR), a nuclear receptor found inside reproductive target cells. This molecular interaction initiates changes in gene activity, converting the uterine lining (endometrium) from a state of growth (proliferation) into a thin, secretory state. This conversion and subsequent tissue-level stabilization is the direct physiological mechanism resulting in altered uterine tissue architecture.

Central Hormonal Axis Inhibition

The medication also exerts a significant central action by engaging a negative feedback loop on the Hypothalamic-Pituitary-Ovarian (HPO) Axis. By maintaining a continuous, synthetic hormonal signal, Norethisterone suppresses the release of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) from the pituitary gland. This systemic suppression limits the natural cyclical hormonal peaks, resulting in a sustained, non-cyclical hormonal profile in the body.

Pathway Modulation and Physiological Constraints

Beyond its direct receptor effects, Norethisterone induces a thickening of the cervical mucus, increasing its viscosity and making it less permeable. Importantly, the drug's activity is subject to modulation by its own breakdown products; the major metabolite, 5alpha-Dihydronorethisterone (5alpha-DHNET), has significantly lower PR affinity and distinct properties, which collectively shape the final balance of receptor activity within the reproductive system.

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Dosage and Administration Information

How to Use Norethisterone Actavis

The usage of Norethisterone Actavis is strictly governed by the product's official prescribing information, which outlines the required route, dose, frequency, and timing. The medication is exclusively administered via the oral route in the form of a 5 mg tablet.


Official Administration Guidelines

Feature Labeled Instruction
Dosing Range Varies widely by regimen, typically ranging from 2.5 mg to 15 mg daily for most gynaecological uses. Specific high-dose regimens may require up to 60 mg/day.
Frequency Once, twice, or three times daily, often following cyclic patterns (e.g., Days 19–26) or as a continuous short-term course.
Food/Timing The tablet may be taken with or without food but must be taken at the same time each day to maintain hormonal stability.
Course Duration Ranges from short-term (e.g., 10 to 14 days) to long-term continuous use (e.g., minimum 6 months). Withdrawal bleeding is an expected event following discontinuation of a short course.

Procedural Administration Rules

Age-Related Use: Norethisterone is not indicated for administration in female patients who have not yet reached menarche (the onset of menstruation).

Missed Dose Protocol: If a scheduled dose is forgotten, it should be taken immediately unless the time for the next dose is near. It is explicitly required that a double dose must not be taken to compensate for the missed tablet.

These official rules define the standardized procedural structure for the use of the medicine, ensuring that the correct amount is delivered at the required frequency, whether the regimen is cyclic, short-term, or continuous.

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Recent Clinical Evidence

Research Evidence / Overview of Studies


Early Research and Safety Profile

Research has examined the role of Norethisterone in various gynecological conditions, and studies have explored whether it may affect patient outcomes. Evidence has mainly focused on its use in adults experiencing specific chronic conditions, such as endometriosis and abnormal uterine bleeding.

Initial trials focused on the drug's safety and tolerability. Research explored whether the drug's activity involved specific biological pathways related to hormone receptors.

Studies on Effectiveness in Chronic Conditions

One key study evaluated whether taking Norethisterone was associated with a change in pain and symptoms in women with chronic pain conditions like endometriosis. The study assessed their condition over a period of several weeks.

  • A reduction in symptom severity was observed in the group receiving the drug.
  • The overall rate of adverse events did not differ significantly between the drug group and the placebo group, as reported by researchers.

These initial results led researchers to explore whether the drug could be a potential area of study for chronic pain and heavy menstrual bleeding (menorrhagia).

Combination Therapy and Long-Term Follow-up

A study compared the drug with other treatments, and the results indicated variation in patient-reported quality of life when the drug was compared with other treatments. Further research examined whether the combined use of Norethisterone and other hormonal agents was associated with a difference in the overall outcome for managing fibroids or severe endometriosis-related pain.

Research has included long-term follow-up studies extending beyond six months to observe the effects and safety profile, particularly when used for extended periods to manage chronic conditions.

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Frequently Asked Questions (FAQ)

Common questions about Norethisterone Actavis (FAQ)


Q: What are the main conditions that Norethisterone Actavis is approved to treat?

According to the official product information, Norethisterone is approved for the treatment of various gynaecological disorders. These typically include conditions like endometriosis, abnormal uterine bleeding, amenorrhoea (the absence of menstrual periods), and to assist with the timing of menstruation.


Q: Why is Norethisterone Actavis prescribed for heavy periods?

Official regulatory documentation states that Norethisterone is approved for treating gynaecological conditions, including menorrhagia—the clinical term for heavy or prolonged menstrual periods. The drug’s purpose is to act as a progestogen to regulate and stabilize the hormonal environment.


Q: Is Norethisterone Actavis used for menstrual cycle regulation?

Yes, official documents indicate that the medication is used for the regulation and stabilization of hormonal balance. This action helps re-establish a more normal menstrual cycle in the context of certain conditions.


Q: Does Norethisterone Actavis help with premenstrual syndrome (PMS)?

Official regulatory documents list premenstrual syndrome (PMS) as a condition for which Norethisterone may be used. The medication is listed as a potential option to address the symptoms associated with PMS.


Q: What is the connection between Norethisterone Actavis and endometriosis?

Official regulatory documents list endometriosis as one of the gynaecological conditions for which Norethisterone is approved for treatment. The drug's hormonal action is utilized in the management of symptoms associated with this condition.


Q: Is it true that Norethisterone Actavis is used to manage certain types of cancers?

Historical authoritative documentation mentions that Norethisterone acetate (a derivative of the active ingredient), has been used in the management of certain hormone-dependent conditions, such as inoperable breast cancer. This historical use is distinct from the primary gynaecological uses of Norethisterone Actavis.


Q: Why might a doctor prescribe this drug for a non-menstrual issue?

The drug is approved to treat gynaecological conditions that are not solely menstrual, such as endometriosis. Official documentation also mentions its use in combination formulations, alongside other agents, for chronic conditions such as uterine fibroids.


Q: Can Norethisterone Actavis be used for period delay?

Norethisterone is licensed or approved for use in the management of the menstrual cycle, including the purpose of timing or postponing menstruation.


Q: Is Norethisterone Actavis a contraceptive or birth control pill?

Norethisterone Actavis is a single-entity progestogen prescribed for hormonal regulation. Although a lower dose of norethisterone is available as a progestogen-only pill (mini-pill), the therapeutic dose (5mg) used for gynaecological conditions is not considered a reliable contraceptive method.


Q: Is Norethisterone Actavis the same as other medicines with Norethisterone in them?

Norethisterone Actavis is a specific, single-entity preparation containing the active ingredient Norethisterone. Regulatory guidance for all approved formulations assumes the same core active substance, and does not establish functional differences between these products.


Q: Is there a generic version of Norethisterone Actavis?

Yes. Norethisterone is the official active ingredient and is also the substance used in generic formulations. Norethisterone Actavis is a specific brand name preparation of this compound.


Q: Do studies show a difference in effectiveness between different brands of Norethisterone?

Regulatory guidance for Norethisterone is generally applied to all approved formulations, including different brands and generics. These are considered to contain the same core active ingredient, and regulatory guidance does not establish differences in core function between these products.


Q: What does official research say about the long-term use of Norethisterone Actavis?

Research evidence has included long-term follow-up studies extending beyond six months, particularly when the drug is used for extended periods. These studies were conducted to observe the long-term effects and safety profile.


Q: Does Norethisterone Actavis affect my fertility in the future?

Studies and official information state that the hormonal suppression of the menstrual cycle is reversed upon stopping the medication. Fertility is generally expected to return after stopping the drug.


Q: How quickly does Norethisterone Actavis start working?

Official guidance indicates that the onset of the primary physiological effect varies by use. For uterine bleeding not associated with physical lesions, the arrest of bleeding may occur within one to three days after starting the administration regimen.


Q: Is it normal to have spotting while taking Norethisterone Actavis?

Yes. Official safety information classifies uterine bleeding and spotting as a Very Common adverse effect, meaning it affects more than 1 in 10 users. This side effect is noted as being particularly frequent at the start of treatment.


Q: Does Norethisterone Actavis change my sex drive?

Official regulatory safety information lists a change in sexual desire as a potential adverse effect associated with the use of the medication.


Q: Can Norethisterone Actavis make my migraines worse?

Regulatory warnings state that the medication must not be used in individuals with a history of migraine with focal neurological symptoms. The official documentation notes that an increase in the frequency or severity of headaches may necessitate review of treatment.


Q: Is it possible to be allergic to Norethisterone Actavis?

Official safety information states that Norethisterone is contraindicated (must not be used) in individuals with a known allergy to the active ingredient. Hypersensitivity reactions are also listed as a potential adverse effect.


Q: Does taking Norethisterone Actavis protect against sexually transmitted infections?

Official regulatory patient information explicitly states that this type of medication does not protect against HIV infection (AIDS) or other sexually transmitted diseases. Official information is limited to the drug's non-protective effect against STIs.


Q: Can I take Norethisterone Actavis at the same time as pain relievers like ibuprofen?

Official regulatory information notes that co-administration with Nonsteroidal Anti-inflammatory Drugs (NSAIDs), such as ibuprofen, requires careful consideration due to documented concerns. This is due to a documented risk of additive fluid retention.


Q: Are there any food or drinks that I should avoid while on this medication?

Official use guidelines state that the tablets may be taken with or without food. Regulatory information does not list the need to avoid specific types of food or non-alcoholic beverages.


Q: Does this medicine affect my ability to drive or operate machinery?

Official regulatory information explicitly states that Norethisterone is not known to affect the ability to drive or operate machinery.


Q: How is Norethisterone Actavis different from combination birth control pills?

Norethisterone Actavis is a single-entity progestogen formulation (synthetic Progesterone). In contrast, combination birth control pills contain both an estrogen and a progestin. This difference in composition is associated with different approved uses and regulatory constraints.


Q: Can I take Norethisterone Actavis if I am close to menopause?

Official eligibility rules focus on the use of this medication in adult menstruating females. The medication is generally not recommended for use in older adults due to a lack of sufficient data, which applies to the age group beyond reproductive years.

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How should Norethisterone Actavis be stored and disposed of?

How to Store and Dispose of Norethisterone Actavis?

The official labeling mandates precise requirements for storing and discarding Norethisterone tablets to maintain stability.


Storage Requirements

Norethisterone Actavis must be stored at a temperature not above 25 C. The tablets should be kept in their original container to protect the contents from light. To ensure safety, this medicine must be kept out of the sight and reach of children.

Do not use the tablets after the expiry date stated on the carton, which refers to the last day of that month, or if any signs of deterioration are observed.


Disposal Instructions

Unused or expired Norethisterone Actavis should not be disposed of via wastewater or with household refuse. All unused product or waste material must be disposed of in accordance with local requirements for pharmaceutical waste.

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

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