Stenofix

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Stenofix

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Stenofix

What is Stenofix? A Foundational Definition

Property Description
Active ingredient Dutasteride (INN)
Form Soft gelatin capsule (Oral)
Pharmacological class 5-alpha reductase inhibitor (Dual)
Common purpose Hormone-driven tissue growth suppression
Origin Synthetic 4-azasteroid compound

1. What Type of Drug is Stenofix? (Classification and Origin)

Stenofix is a prescription-only medicine whose active component is Dutasteride, which classifies it as a 5-alpha reductase inhibitor (5-ARI). This drug is a synthetic 4-azasteroid compound, chemically engineered to modulate the effects of male hormones in the body. Dutasteride is pharmacologically distinct as a dual inhibitor, meaning it potently and irreversibly blocks both the Type I and Type II isoforms of the 5-alpha reductase enzyme. This comprehensive inhibition profile is clinically recognized for achieving a robust, consistent suppression of the targeted hormone, a key feature distinguishing it within its therapeutic class.

2. How Does Stenofix Target Hormonal Growth? (Mechanism and Purpose)

The fundamental purpose of Stenofix is to suppress the concentration of the potent growth-stimulating hormone, Dihydrotestosterone (DHT), which drives the enlargement of certain tissues. The drug's mechanism involves forming a stable complex with the 5-alpha reductase enzyme, thereby halting the physiological conversion of the precursor hormone, Testosterone, into DHT. By continuously limiting the hormonal signal for cell proliferation, the drug's action serves to relieve symptoms associated with the enlargement of androgen-dependent tissues in adult males. Long-term studies have supported the drug’s effectiveness in consistently reducing DHT levels, consequently reducing the volume of the affected tissue.

3. Composition and Dosage Form (Physical Identity)

As a single-ingredient monotherapy, Stenofix is administered exclusively via the oral route as a soft gelatin capsule. This specialized form is a defining characteristic of Dutasteride products; the active substance is dissolved within an oil-based solution inside the capsule, a design choice made to maximize the drug’s systemic bioavailability. This unique formulation ensures the consistent delivery of the synthetic compound required to maintain its inhibitory effect throughout the system.

Regulatory References

  1. Dutasteride: MedlinePlus Drug Information

What side effects are possible with Stenofix?

Possible Side Effects and Safety Information

The safety profile for Stenofix, whose active ingredient is Dutasteride, is officially categorized based on regulatory documents from agencies like the FDA and EMA. This framework details documented adverse reactions according to their frequency and the system-organ class affected, strictly reflecting reported clinical data.


Official Adverse Reaction Classification

Adverse reactions are primarily associated with the Reproductive System and Breast Disorders. Reactions are categorized by frequency of occurrence, as defined in regulatory standards:

Classification Examples of Reactions
Common (Reported ge1%) Impotence, decreased libido, ejaculation disorders, and breast disorders (including enlargement and tenderness).
Uncommon (Reported 0.1% to 1%) Dizziness, alopecia (hair loss), and hypertrichosis (abnormal hair growth).
Frequency Not Known Serious hypersensitivity reactions (e.g., angioedema), depressed mood, testicular pain, testicular swelling, and cardiac failure (congestive heart failure).

Safety Constraints and Special Considerations

Regulatory safety information outlines specific high-level concerns and population restrictions. Stenofix is officially contraindicated in pregnant women and those of childbearing potential due to the risk of inhibiting the development of the external genitalia in a male fetus. It is also contraindicated in patients with severe hepatic impairment.

Safety data notes that the incidence of sexual adverse reactions generally decreases with the duration of treatment, though the effects may persist in some individuals after discontinuation. Furthermore, the medicine causes a significant reduction in serum Prostate-Specific Antigen (PSA) levels, a fact that must be accounted for when interpreting prostate cancer screening results.

Overdose and Emergency Response

Overdose and when to seek help

This information reflects the documented overdose profile and mandated emergency actions for Stenofix (Dutasteride), strictly as reported in official government regulatory documents.


Overdose Scope

Documented Overdose Presentations and Actions

Classification Official Regulatory Statement
Specific Acute Symptoms No specific acute overdose symptoms have been formally documented in controlled clinical trials, even with exposure up to 10 times the therapeutic dose for six months.
Immediate Emergency Action Seek immediate medical attention or call emergency services if the individual experiences a seizure, collapse, or trouble breathing. Contact a Poison Control Center immediately upon suspected overdose.
Life-Threatening Outcomes Immediate help is required for signs of severe hypersensitivity, such as swelling of the face, tongue, or throat.

Overdose Management Considerations

The regulatory profile mandates a focus on supportive care and pharmacokinetic factors. No specific antidote is known for Stenofix overdose, and management involves providing appropriate symptomatic and supportive treatment. Due to the drug's long terminal elimination half-life of approximately five weeks, this persistence must be considered during the assessment and monitoring of an overdose. Furthermore, management must account for the potential for higher systemic exposure in patients with hepatic impairment due to the drug's extensive liver metabolism.

Therapeutic Uses of Stenofix

What Stenofix Treats: Main Uses and Benefits

Stenofix is a medication designed to offer supportive, short-term symptomatic relief across various clinical scenarios, primarily focusing on addressing periods of heightened discomfort and assisting with maintaining functional stability. Short-term symptomatic assistance can be relevant for managing symptoms that begin suddenly.


The medicine is used in situations involving certain distressing symptoms, where it contributes to day-to-day comfort. The medicine is applied across therapeutic domains, including situations involving symptoms that interfere with daily comfort, conditions characterized by periods of heightened symptoms, and scenarios where symptoms create noticeable physiological strain. Stenofix is often applied during phases of increased distress or discomfort when supportive relief is needed. It is relevant in clinical settings marked by increased discomfort or tension.

Quick Fact: Supportive Assistance for Heightened Symptoms

Stenofix may provide support that helps ease the overall symptom burden, assisting patients during acute or recurrent symptom episodes and temporary functional strain. It contributes to maintaining a sense of stability when symptoms are more noticeable.

Regulatory References

  1. NIH MedlinePlus overview on pain relief

Eligibility and Restrictions for Use

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

Stenofix (Dutasteride) is strictly regulated for use, with multiple absolute exclusions defining who may not take the medicine. Eligibility is established solely for adult males.


Category Official Regulatory Status / Rule
Populations for whom use is allowed Adult Males. Safety and effectiveness are established, including for older adults (aged 65 and over), who do not require a dosage adjustment.
Populations for whom use is contraindicated Females, including those who are pregnant or may become pregnant. Pediatric Patients (children and adolescents under 18 years of age). Patients with a known hypersensitivity to dutasteride, other 5-alpha reductase inhibitors, or any component of the formulation.
Age-related eligibility rules Contraindicated in pediatric patients (under 18 years). Safety and effectiveness are not established in this age group.
Condition-specific eligibility rules Contraindicated for patients with Severe Hepatic Impairment (severe liver disease). Use with Caution is advised for patients with mild to moderate hepatic impairment and severely renal impaired patients.
Pregnancy and lactation eligibility status Contraindicated in females who are pregnant due to the risk of fetal harm. It is not known if the drug is excreted in human milk.
Eligibility-related restrictions Women who are pregnant or may become pregnant must not handle leaking capsules. Men taking the drug should not donate blood until at least 6 months after their last dose.

Eligibility Classifications (High-Level)

The most serious eligibility severity classification applied is Absolute Contraindication for pregnancy, pediatric use, severe hepatic impairment, and hypersensitivity. This strict basis is mandated by the Prescribing Information / Summary of Product Characteristics (SmPC). The main eligibility-context constraint is the risk of fetal harm if the drug is absorbed by a pregnant woman.

Connection to the Overall Eligibility Profile

Regulatory documents define who can and cannot use the medicine through stringent absolute exclusions based on sex, age, and existing health conditions. This ensures that the medicine is reserved for the only population in which its safety has been established: adult males without contraindicating conditions.

What should I know about interactions with other medicines?

Stenofix, which contains the active substance isoxsuprine, can interact with other medications, potentially affecting its efficacy or increasing the risk of certain side effects, particularly those related to blood pressure and heart rate. It is essential to inform your healthcare provider about all prescription and non-prescription medicines, vitamins, dietary supplements, and herbal products you are currently taking.

Potential Drug Interactions

Stenofix is a vasodilator, meaning it widens blood vessels. Combining it with other medicines that also lower blood pressure can lead to an additive effect, causing a significant drop in blood pressure (hypotension) and associated symptoms like dizziness or fainting. Therefore, caution and special monitoring may be necessary when taking Stenofix with:

  • Medicines for high blood pressure (Antihypertensives): This includes medications such as beta-blockers, ACE inhibitors, calcium channel blockers, and diuretics.

  • Other Vasodilators: Medicines used to treat heart conditions or other circulatory problems.

Other Important Interactions

Substance Potential Effect of Interaction
Nicotine/Tobacco Products May decrease the effectiveness of Stenofix.
Alcohol Can increase side effects such as dizziness and flushing, and may contribute to rapid heartbeats.

Always consult your doctor or pharmacist to assess your specific risk profile before starting any new medication or discontinuing an existing one while taking Stenofix. They may adjust your dosage or recommend alternative treatments.

Mechanism of Action

Dual and Irreversible Inhibition of 5alpha-Reductase Enzymes

Stenofix functions as a dual inhibitor of the enzyme 5alpha-reductase, targeting both Type I and Type II isoforms. This mechanism involves the active component, Dutasteride, forming a stable, irreversible complex with the enzyme, permanently blocking the metabolic conversion of Testosterone into the androgen Dihydrotestosterone (DHT). This enzyme inhibition is the initiating step in the physiological cascade that modulates androgen signaling.


Modulating Androgen-Driven Tissue Growth Signaling

The suppression of DHT levels, typically by over 90%, reduces the activity of the androgen-driven cell proliferation cascade within target tissues. The diminished concentration of DHT lessens the hormonal stimulus for cell survival and growth, shifting the cellular balance toward apoptosis (programmed cell death). This prolonged physiological change results in a gradual decrease in the volume of the tissue structure modulated by androgens.

Dosage and Administration Information

Administration Guidelines for Stenofix

Stenofix (Dutasteride) administration is standardized to ensure consistent systemic delivery for the purpose of long-term therapy. The medication is for oral administration as a 0.5 mg soft gelatin capsule.


Administration Scope

The standard dosing regimen involves taking the 0.5 mg capsule once daily. This consistent, continuous daily schedule is maintained as the medication is designated for long-term use, typically requiring up to six months of administration to achieve the established therapeutic steady-state.

Instruction Detail
Dosing schedule 0.5 mg taken once daily (monotherapy).
Timing in relation to meals May be taken with or without food.
Missed-dose rule If a dose is missed, do not take an extra capsule to compensate; resume the regular daily schedule the following day.

Administration Protocol and Patient Status

Standard step sequence:

  • Take the required 0.5 mg dose once per day.
  • Swallow the soft gelatin capsule whole.
  • Do not chew, crush, or open the capsule before swallowing.
  • Continue treatment daily for the prescribed long-term duration.

Population Considerations: Dosing remains consistent across the adult population. No dosage adjustment is necessary for older adults or individuals with renal impairment. However, caution is recommended in patients presenting with mild-to-moderate hepatic impairment, as no specific dosage adjustment guidelines are formally established.


Connection to the Overall Use Protocol

These instructions establish the procedural framework for Stenofix use, involving the uninterrupted, long-term, once-daily ingestion of the intact 0.5 mg soft capsule. The standardized dose and frequency, combined with specific handling rules, define the method of systemic delivery. This protocol is applied across most adult patient groups.

Recent Clinical Evidence

Stenofix: Research Evidence Overview

The clinical understanding of Stenofix (Dutasteride) is based primarily on evidence derived from large, long-term Randomized Controlled Trials (RCTs) and supporting data from systematic reviews and real-world observational studies. Research has primarily focused on conditions characterized by androgen-dependent tissue growth and related outcomes. Studies help show what has been observed so far in specific populations under controlled conditions, providing context but not individual predictions.


Evidence for Use in Symptomatic Benign Prostatic Hyperplasia (BPH)

The evidence for this indication relies on multiple large, well-designed RCTs and their long-term follow-up extensions, involving adult men aged 50 and older with symptomatic, enlarged prostate glands. Researchers examined various outcomes related to physical discomfort and systemic imbalance associated with BPH. Studies reported measurements of changes in prostate volume and observations of a timed pattern of change in symptom scores and urinary flow rates. Long-term research has also focused on tracking the incidence of acute BPH-related events, such as acute urinary retention (AUR) and the need for surgery related to BPH. Studies monitored patterns observed in these outcomes when compared to control groups.

Evidence for Use in Male Pattern Hair Loss (Androgenetic Alopecia)

Research evaluating Stenofix for male pattern hair loss has included RCTs and prospective studies focusing on adult men with varying degrees of androgenetic alopecia. The studies explored changes measured over defined time intervals, typically up to one year. Primary research examined hair growth using objective measures like changes in total hair count in a specific area of the scalp. Research highlights measured changes in these objective and subjective outcomes, indicating measured changes in the observed populations.

Key Limitations and Areas of Uncertainty

The certainty remains low for long-term outcomes and the durability of response, particularly for hair loss, as follow-up durations were limited in many primary trials. Furthermore, the evidence quality varies across studies, and comparative evidence is lacking. Research highlights that results apply only to the populations studied, and there are still areas where more research is needed for a complete understanding.

Frequently Asked Questions (FAQ)

Common questions about Stenofix (FAQ)


Q: How quickly does Stenofix start to work?

A: The full therapeutic effect of Stenofix is typically observed after a period of continuous administration. Regulatory documents indicate that the medicine generally requires up to six months to achieve a stable, established concentration in the body.


Q: How long after starting Stenofix might someone notice a change?

A: Studies examining the use of Stenofix show that measurable changes take time. For symptomatic benign prostatic hyperplasia (BPH), improvement in urinary symptoms was observed after approximately six months of continuous treatment.


Q: What happens if I forget to take a dose of Stenofix?

A: If a dose is missed, regulatory guidance instructs the user not to take an extra capsule to compensate for the missed dose. Regulatory guidance indicates that the regular daily schedule should be resumed the following day.


Q: What should I do if a side effect of Stenofix seems severe?

A: The safety profile documents rare and serious reactions, such as severe hypersensitivity reactions like angioedema (swelling of the face, tongue, or throat). Official safety information notes that all adverse events should be reported to a healthcare provider.


Q: How long does Stenofix stay in the system?

A: The active ingredient in Stenofix has a relatively long elimination half-life, which is approximately four to five weeks. Because of this, the active ingredient can be detectable in the serum for up to six months after the last dose.


Q: How do doctors decide if Stenofix is appropriate for a patient?

A: Official regulatory labels describe the drug’s intended purpose, the patient population in which it has been studied (adult men), and specific medical conditions that may contraindicate its use. The final decision on whether Stenofix is appropriate for an individual is based on a healthcare professional’s full clinical assessment.


Q: Is Stenofix known to be safe for long-term use?

A: Yes, the medication is designated in regulatory documents for continuous, long-term therapy. The safety profile is based on long-term clinical data, which reports that certain sexual adverse reactions tend to decrease with the duration of treatment.


Q: Is Stenofix the same type of medicine as [similar generic drug]?

A: Stenofix is classified as a 5-alpha reductase inhibitor (5-ARI). This means it belongs to a specific class of drugs that work by blocking the 5-alpha reductase enzyme.


Q: Can Stenofix be taken with common over-the-counter pain relievers?

A: Official documents do not consistently note a specific interaction between the active ingredient in Stenofix and common over-the-counter pain relievers, such as acetaminophen or ibuprofen. However, general caution is advised with all medications, particularly for patients with existing hepatic (liver) impairment.


Q: What are the most common side effects people report when taking Stenofix?

A: The most frequently reported reactions (classified as common, ge 1%) documented in the safety profile are impotence, decreased libido (sex drive), ejaculation disorders, and breast disorders (including enlargement and tenderness).


Q: Are there any common supplements that should not be taken with Stenofix?

A: Regulatory guidance requires informing a healthcare provider about all prescription or non-prescription medicines, herbal products, or vitamin supplements you are taking. This consultation allows for the evaluation of the potential interaction profile with the medicine.


Q: Do I need to have regular blood tests while taking Stenofix?

A: The medicine causes a significant reduction in serum Prostate-Specific Antigen (PSA) levels. This fact requires careful interpretation by a healthcare professional when conducting prostate cancer screening. Regular monitoring is necessary to account for this change.


Q: What is the difference between Stenofix and a placebo in studies?

A: Clinical studies demonstrate measurable benefits from Stenofix compared to a placebo (an inactive treatment) in the populations studied. These observed benefits include a reduction in prostate volume, improvement in symptom scores, and a lower incidence of acute urinary retention.


Q: What kind of studies support the use of Stenofix?

A: The clinical understanding of Stenofix is primarily based on evidence derived from large, long-term Randomized Controlled Trials (RCTs). This research is also supported by systematic reviews and real-world observational studies.


Q: Can a person with diabetes use Stenofix?

A: Official regulatory guidance does not list diabetes as a contraindication for use. However, some clinical studies of this drug class have reported an association with a modest increase in the observation of Type 2 diabetes.


Q: How long does it take for Stenofix to leave the body?

A: The active ingredient in Stenofix has an elimination half-life of approximately four to five weeks. This value describes the time it takes for half of the dose to be cleared from the system.


Q: What types of people were included in the Stenofix research studies?

A: Clinical trials for the main indications primarily involved adult men aged 50 and older with symptomatic benign prostatic hyperplasia (BPH) and adult men with androgenetic alopecia (male pattern hair loss).


Q: What is the main benefit described in the research for Stenofix?

A: Research primarily describes benefits related to the long-term modulation of androgen-driven tissue growth. This results in observed changes such as a gradual decrease in prostate volume and a reduction in the incidence of acute BPH-related events.


Q: Is Stenofix an opioid or habit-forming drug?

A: Stenofix is classified as a 5-alpha reductase inhibitor (5-ARI). It is not classified as an opioid or a controlled substance with potential for abuse or habit formation in the official regulatory documents.


Q: Are there any documented interactions between Stenofix and alcohol?

A: Official interaction guidance notes that alcohol consumption can be associated with increased side effects, such as dizziness and flushing, and may contribute to rapid heartbeats.


Q: Can I take other prescription medications with Stenofix?

A: Stenofix may interact with other prescription medications, particularly those that lower blood pressure (such as antihypertensives and vasodilators). It is essential for patients to inform their healthcare provider about all medicines they are taking to assess the specific risk profile.


Q: Is Stenofix available as a generic medicine?

A: Yes, the active ingredient in Stenofix, Dutasteride, is available as a generic medicine in many regions.


Q: Is it true that Stenofix is used for more than one condition?

A: Yes, regulatory and research evidence has focused on the use of Stenofix for both symptomatic benign prostatic hyperplasia (BPH) and male pattern hair loss (androgenetic alopecia).


Q: Does Stenofix affect mood or mental state?

A: Regulatory safety data includes depressed mood as a documented adverse reaction, though it is categorized as being of frequency not known.


Q: Does Stenofix require a special prescription?

A: Stenofix is classified as a prescription-only medicine. It does not require a special controlled substance prescription.


Q: How should I store Stenofix medicine?

A: The medicine should be stored at controlled room temperature, away from excessive heat, moisture, or direct light. The capsules must be kept in their original, tightly closed container and must be swallowed whole to maintain integrity.


Q: Is it normal to feel slightly dizzy when first starting Stenofix?

A: Dizziness is listed in the safety profile as an uncommon adverse reaction, meaning it has been reported in 0.1% to 1% of patients in clinical data.

How should Stenofix be stored and disposed of?

Storage Requirements

Stenofix (Dutasteride capsules) must be stored at controlled room temperature, typically between 15 C and 30 C (59 F and 86 F), and should be kept away from excessive heat, moisture, and direct light. The capsules must be maintained in their original container and kept tightly closed. To preserve the integrity of the soft gelatin capsule, they must not be chewed, crushed, or opened, as contact with the contents can cause irritation.

Handling and Disposal Instructions

Due to the risk of absorption through the skin and potential harm to a male fetus, women who are pregnant or may become pregnant should not handle the capsules. If accidental contact with a leaking capsule occurs, the exposed area must be washed immediately with soap and water. The medicine must be stored out of the sight and reach of children.

Expired or unused Stenofix should be safely discarded according to local regulations. The product must not be flushed down the toilet or disposed of in wastewater. Additionally, men taking this medication should not donate blood until at least 6 months after the last dose to prevent administration to a pregnant transfusion recipient.

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

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Equivalent of Stenofix found in:

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