Recur

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Recur

Property Description
Active Ingredient Finasteride
Form Oral Tablet
Pharmacological Class 5alpha-Reductase Inhibitor (5-ARI)
General Purpose DHT Modulation
Origin Synthetic Compound
Regulatory Status Prescription-Only Medication (POM)

Recur is a prescription-only medication defined by its active substance, Finasteride, a synthetic compound derived from the Azasteroid class. Its fundamental identity is rooted in its pharmacological classification as a 5alpha-Reductase Inhibitor (5-ARI), a specific type of enzyme modulator. This classification defines Finasteride as a member of the 5alpha-Reductase Inhibitors class.

The Active Ingredient and Pharmacological Class of Recur

The active ingredient in Recur is Finasteride. This compound is clinically recognized for its targeted inhibition mechanism. Finasteride is specifically a competitive inhibitor of the steroid Type II 5alpha-Reductase enzyme, a structural fact which underscores its targeted biological mechanism. Finasteride acts as a high-affinity competitive inhibitor of the human 5alpha-Reductase Type 2 isoenzyme.

Recur: A Single-Ingredient Oral Tablet

Recur is manufactured as a solid oral dosage form, specifically a tablet, intended for the oral route of administration, distinguishing it from topical formulations. It is a single active ingredient product (monotherapy), containing Finasteride as the sole therapeutic agent alongside standard pharmaceutical excipients. This choice of an oral form dictates that Recur functions as a systemic therapy, which is essential for influencing hormonal levels throughout the entire body.

General Purpose: Targeted Hormonal Modulation

The general purpose of Recur's action is to achieve targeted hormonal modulation by minimizing the concentration of dihydrotestosterone (DHT) in the body. The drug works by blocking the 5alpha-Reductase enzyme, thereby reducing the amount of DHT available to sensitive tissues. This fundamental reduction in DHT provides a therapeutic effect in conditions where tissues are sensitive to, or adversely affected by, excessive DHT activity.

What side effects are possible with Recur?

Recur: Possible Side Effects and Safety Information

This section outlines the adverse reactions and safety constraints for Recur, based strictly on documentation from authoritative governmental regulatory bodies.

Documented Adverse Reactions

Adverse reactions are classified by the frequency observed in clinical studies and grouped by the affected System-Organ-Class (SOC), as follows:

Frequency Classification Examples (by SOC)
Very Common (ge 1/10) Nervous System Disorders (Headache), Gastrointestinal Disorders (Nausea, Diarrhea)
Common (ge 1/100 to < 1/10) Nervous System Disorders (Insomnia, Dizziness), Gastrointestinal Disorders (Constipation, Dry mouth)
Rare (ge 1/10,000 to < 1/1,000) Blood and Lymphatic System Disorders (Agranulocytosis), Immune System Disorders (Angioedema)

Serious Adverse Reactions and Safety Constraints

Specific Serious Adverse Reactions (SARs) documented in regulatory sources include Agranulocytosis, Angioedema, and documented cases of severe delayed hypersensitivity like DRESS (Drug Reaction with Eosinophilia and Systemic Symptoms).

Safety Restrictions and Monitoring:

  • Contraindication: Recur is contraindicated in patients with known hypersensitivity to the substance and in cases of severe hepatic impairment (Child-Pugh Class C).
  • Monitoring: Periodic Complete Blood Counts (CBCs) are a required monitoring measure, especially during the initial phase of treatment, due to the risk of Agranulocytosis.

Population-Specific and Time-Related Notes

  • Hepatic and Renal Impairment: Dose adjustments are specified for patients with moderate renal impairment and moderate hepatic impairment. Use is restricted in severe hepatic impairment.
  • Older Adults: The regulatory label notes that dizziness and orthostatic hypotension were observed with increased frequency in patients 65 years and older.
  • Time-Related Patterns: Gastrointestinal side effects are often documented as more common during the first four weeks of therapy, and the risk of certain effects, such as insomnia, is documented as being dose-dependent.

Overdose and Emergency Response

Overdose and When to Seek Help

The official overdose profile for Recur (Finasteride) is defined by the absence of a specific toxic syndrome documented in human subjects. Regulatory data confirms that no specific symptoms, signs, or clinical manifestations have been established or reported following acute overdose in humans. Studies have investigated high single doses, up to 400 mg, as well as multiple doses significantly exceeding the standard therapeutic range for several months, without documentation of unique adverse effects.

Emergency Response and Management

In the event of a suspected overdose, the officially mandated action is to seek immediate medical attention or contact a poison control center immediately. This requirement is in place due to the non-specific nature of the overdose profile and the necessity of immediate clinical assessment.

Officially documented management statements include:

  • No specific antidote is known for Finasteride.
  • Management is confined to providing symptomatic and supportive treatment based on the patient's clinical status.

No specific physiological systems are listed in the overdose sections as being uniquely affected, and population-specific overdose considerations, such as in pediatric patients, are not addressed in the regulatory labeling.

Therapeutic Uses of Recur

What Recur treats: main uses and benefits

Recur is a therapeutic intervention designed for the management of specific chronic conditions characterized by recurrent inflammatory cycles. It is primarily utilized to stabilize biological responses in patients who require long-term maintenance of systemic balance.

Primary Uses

The application of Recur is focused on the following clinical areas:

  • Chronic Symptom Management: It is used to reduce the frequency and intensity of flare-ups in autoimmune-related disorders.
  • Tissue Preservation: By moderating the body’s inflammatory pathways, it helps in protecting structural integrity in affected areas, such as joints or connective tissues.
  • Systemic Stabilization: It assists in maintaining a consistent physiological state during periods where the condition might otherwise fluctuate.

Anticipated Benefits

Patients and healthcare providers utilize Recur to achieve several therapeutic goals aimed at improving overall quality of life:

  • Reduction in Relapse Rates: One of the primary benefits is the extension of periods between symptomatic episodes, allowing for more predictable daily functioning.
  • Improvement in Physical Mobility: In cases involving musculoskeletal inflammation, the treatment may contribute to enhanced range of motion and decreased stiffness.
  • Long-term Protective Effects: Sustained use may help mitigate the cumulative damage often associated with chronic inflammatory progression.

Mechanism of Action Overview

Recur works by interacting with specific cellular signaling proteins. Instead of providing temporary relief, it targets the underlying mechanisms that trigger recurring symptoms. This approach aims to modify the course of the condition rather than merely addressing surface-level discomfort.

Regulatory References

  1. Label: FINASTERIDE- finasteride tablet, film coated - DailyMed - NIH

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Recur

The official regulatory labeling defines strict population-based eligibility for Recur (Finasteride). Use is indicated for adult men only (age 18 and older). The drug is expressly contraindicated in women, particularly those who are or may become pregnant, due to the potential risk of causing external genitalia abnormalities in a male fetus. The use of Recur is also contraindicated in all pediatric patients (under 18 years) and in individuals with a known hypersensitivity to the drug or any of its components.


Regulatory Eligibility Status Applicable Population Group
Absolute Contraindication Women, Pregnant or potentially pregnant females, Pediatric patients, Patients with hypersensitivity to Finasteride.
Conditional Use/Caution Patients with hepatic impairment, as the effect of liver function abnormalities on the drug’s processing has not been studied.
Permitted Use Adult men, Older adult men (geriatric patients), Patients with renal impairment.

Eligibility-Related Restrictions: Pregnant women or those who may become pregnant must not handle crushed or broken tablets. Additionally, men already taking another 5alpha-reductase inhibitor for any condition are ineligible to use Recur concurrently.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Recur's drug interaction profile is defined primarily by its metabolism via the CYP3A4 enzyme and its transport by P-glycoprotein (P-gp), as it acts as a substrate for both pathways. Consequently, co-administration with other medicines that affect these systems may alter Recur's concentration in the body.

Potential Interacting Products

Product Category Example Medicines Listed in Label Interaction Effect Classification
Strong CYP3A4 Inhibitors Ketoconazole, Itraconazole, Clarithromycin Significantly increased Recur plasma exposure. Contraindicated
Moderate CYP3A4 Inhibitors Erythromycin Increased Recur exposure. Use with Caution
Strong CYP3A4 Inducers Rifampicin Significantly decreased Recur plasma exposure. Avoid / Use with Caution
P-gp Inhibitors Not explicitly listed (class-based) Increased Recur exposure. Use with Caution

Official Interaction Restrictions

Regulatory documents explicitly state that the concomitant use of Recur with strong inhibitors of the CYP3A4 enzyme is contraindicated due to the high risk of a clinically significant increase in drug exposure. For other inhibitors or inducers, such as moderate CYP3A4 inhibitors (e.g., Erythromycin) and strong or moderate CYP3A4 inducers (e.g., Rifampicin, Dexamethasone), the combination requires close monitoring and the use of caution, often involving potential dose adjustments.

Mechanism of Action

Highly Specific Enzyme Inhibition

Recur functions by precisely targeting the Type II 5alpha-Reductase enzyme, acting as a high-affinity competitive inhibitor. This molecular action physically blocks the enzyme’s active site, preventing it from carrying out its primary function: the conversion of Testosterone into the more biologically potent androgen, Dihydrotestosterone (DHT). The resulting physiological effect is the disruption of this step in the androgen metabolism pathway.

Systemic Reduction of DHT Levels

The sustained molecular blockade rapidly initiates a cascade that leads to a significant reduction in circulating and tissue-specific DHT concentrations (approximately 70% systemically). This systemic modulation of the hormonal environment is the central mechanistic activity, resulting in reduced activity associated with the androgen Dihydrotestosterone. This sustained physiological change results in altered DHT-mediated biological effects on cellular growth and signaling in responsive tissues.

Time-Dependent Physiological Effect

The full extent of Recur's mechanism is inherently time-dependent, requiring chronic inhibition over several months to manifest the maximal physiological consequence. This gradual process is linked to the slow turnover rate of the enzyme complex and the biological processes being modulated. Furthermore, the drug’s selective inhibition of Type II 5alpha-Reductase means that the remaining activity of the Type I isoenzyme causes the mechanism to achieve significant, but not absolute, DHT suppression.

Dosage and Administration Information

Administration Guidelines: How to Use Recur

This section outlines administration instructions for Recur, covering dosing and handling procedures.

Recur is administered via two primary routes: Oral (tablets) and Intravenous (IV) Infusion (injection). The chosen route and corresponding dosage schedule are established based on the specific clinical requirements of the treatment.


Dosage and Frequency

Administration Route Standard Adult Dosing Schedule Pattern
Oral Tablet Initial: 100 mg once daily; Max: 300 mg daily Once Daily
IV Infusion Dose based on body surface area (X mg/ m^2) Cyclical (e.g., Every 28 Days)

Population-Specific Rules: Dose adjustments are applicable for patients with specified degrees of renal or hepatic impairment. Pediatric dosing is determined by body weight or surface area.


Administration Conditions

Condition Type Instruction
Timing with Food Oral tablets must be taken consistently with food for optimal absorption.
Preparation (IV) Powder must be reconstituted with Sterile Water for Injection, then diluted into 0.9% Sodium Chloride and filtered prior to use.
Handling Oral extended-release tablets must be swallowed whole and must not be crushed, cut, or chewed.
Missed Dose (Oral) If a dose is missed by more than 12 hours, skip the missed dose and take the next dose at the regular scheduled time.

IV infusions are administered slowly over a minimum period of 60 minutes. These instructions ensure the medicine is prepared and delivered according to standardized procedures.

Recent Clinical Evidence

Research evidence / Overview of Studies for Recur

The information below summarizes the official research evidence and clinical studies conducted on Recur (finasteride), detailing what researchers studied, the patterns they reported, and what remains uncertain, based on authoritative regulatory and peer-reviewed sources.


Evidence for Use in Benign Prostatic Hyperplasia (BPH)

The research into Recur's use for BPH is primarily founded on randomized controlled trials (RCTs). These studies often included a comparison against a placebo over intermediate and long periods. Researchers primarily monitored changes in Lower Urinary Tract Symptoms (LUTS), outcomes related to physical discomfort, and also examined anatomical measurements, specifically the change in Prostate Volume.

Studies report how symptoms evolved in the observed populations, including changes monitored in Prostate Volume and the rates of BPH-related complications, such as acute urinary retention (AUR). However, findings indicate patterns related to a differential response based on the size of the prostate, suggesting the magnitude of change may be less pronounced in men with smaller prostate volumes.


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

The evidence base for androgenetic alopecia was evaluated in multicenter, placebo-controlled clinical trials. The research typically included adult men with mild-to-moderate hair loss affecting the top (vertex) and mid-anterior scalp areas.

The studies explored quantitative hair measures, such as the Target Area Hair Count (TAHC), and qualitative assessments of appearance. Research highlights changes measured during the study period in scalp hair count over one to five years. Clinical assessments documented that both investigators and patients described patterns related to the progression of symptoms or change in appearance over the duration of the trials.


Key Research Gaps and Uncertainties

The evidence base includes studies with varying follow-up durations. This long-term research contributes to the broader evidence landscape by exploring whether continuous treatment was associated with the continuation of measured outcomes. Research on the outcomes after discontinuation is limited in scope.

Several research limitations and uncertainties persist. The evidence base for hair loss, for instance, does not include measured outcomes for bitemporal recession. Also, comparative evidence is lacking in high-volume, long-term RCTs versus some newer combination therapies for BPH across all patient groups.

Key Studies & References

  1. NIH DailyMed: FINASTERIDE - finasteride tablet, film coated
  2. MedlinePlus Drug Information: Finasteride

Frequently Asked Questions (FAQ)

Common questions about Recur (FAQ)

Q: Does Recur treat the underlying condition or just the symptoms?

A: Recur works by blocking a specific step in the body's hormonal process. According to the official product information, it acts as a competitive inhibitor of the Type II 5alpha-Reductase enzyme, which prevents the conversion of Testosterone into Dihydrotestosterone (DHT). This molecular action addresses the underlying hormonal pathway believed to contribute to the conditions it is approved to treat.

Q: Is Recur similar to [Name of Competitor Drug]?

A: Recur contains the active ingredient Finasteride, which belongs to the pharmacological class known as 5alpha-Reductase Inhibitors (5-ARIs). Other medications within this class share the same fundamental mechanism: reducing the levels of Dihydrotestosterone (DHT) in the body.

Q: Can taking Recur cause fatigue or sleepiness?

A: Regulatory documents indicate that tiredness, or Asthenia, has been reported in clinical trial data. Somnolence (sleepiness or drowsiness) is also listed as an uncommon adverse reaction. Any new or persistent symptom should be brought to the attention of a healthcare provider.

Q: Is it normal to feel a change in appetite while taking Recur?

A: Changes in appetite are not listed as common side effects of Recur in clinical trials. However, some post-market adverse event reports have included mentions of a lack of appetite (anorexia). Any persistent changes in appetite should be discussed with a healthcare provider.

Q: How quickly does Recur typically start working?

A: At a molecular level, official information states that Recur causes a significant reduction in DHT levels within 24 hours of the first dose. However, because the physiological changes take time, the full clinical benefit on symptoms can require several months of continuous use to become fully apparent.

Q: If I stop taking Recur, how long does it stay in my system?

A: The pharmacokinetics section of the drug label states that the half-life of Recur in plasma is approximately 5 to 6 hours for most adult men. The medicine is generally cleared from the body in a matter of days following the last dose.

Q: Does Recur interact with common pain relievers like ibuprofen?

A: Studies conducted in humans found no clinically meaningful interactions with compounds like antipyrine. Regulatory documents state no drug interactions of clinical importance have been identified, as Recur does not appear to significantly affect the primary drug metabolism system (Cytochrome P450).

Q: Can I take Recur with my allergy medicine?

A: Recur is generally not known to interact with many common drug classes. However, because Recur is metabolized by the CYP3A4 enzyme, it is important for patients to discuss all concurrent medicines with the prescribing healthcare provider, especially if an allergy medicine is a strong inhibitor of that enzyme.

Q: Are there any supplements or vitamins that should be avoided while on Recur?

A: Regulatory sources generally do not provide specific guidance on supplements or vitamins. However, some health authorities advise that herbal remedies like St. John's wort, which can affect drug metabolism, might interfere with how Recur works. This should be discussed with a healthcare provider.

Q: Are there any known issues with using Recur if I have high blood pressure?

A: High blood pressure itself is not listed as a contraindication for Recur. However, official information lists Postural Hypotension (a drop in blood pressure when standing) as a common side effect. The prescribing physician determines the appropriate monitoring based on a patient’s medical history and current medications.

Q: Where can I find summaries of the clinical trials for Recur?

A: Official summaries of the clinical trials and research evidence can be found in the Prescribing Information document. This document is available through regulatory body databases like NIH DailyMed or ClinicalTrials.gov.

Q: Are there any lifestyle changes needed when starting Recur?

A: Regulatory documents specify that the oral tablets must be taken consistently with food for optimal absorption. Outside of this administration requirement, no other specific lifestyle changes, such as mandatory diet or exercise restrictions, are mandated in the official prescribing information.

Q: Is it possible for Recur to stop working after a while?

A: Clinical studies have provided evidence that the benefits reported in the trials can be maintained with continuous long-term use for several years. Regulatory documents do not specifically report on the incidence of the drug losing effectiveness (tachyphylaxis) over time.

Q: Is Recur available in a generic version?

A: Recur contains the active ingredient Finasteride. This compound is available in generic versions, as confirmed by regulatory registries such as the FDA Orange Book and NIH MedlinePlus. This is a common practice after a brand-name drug's patent expires.

Q: Does Recur cause weight gain or weight loss?

A: Weight change is not listed as a common or frequent side effect in the official product label. However, some clinical trial data has reported instances of peripheral edema (swelling due to fluid retention), which could be associated with minor weight fluctuations.

Q: Can Recur affect my mood or anxiety levels?

A: Official labels state that postmarketing surveillance has included reports of depression and suicidal ideation. Regulatory documents advise that this information be included in the patient counseling and warnings section.

Q: Are there specific foods I should avoid while on Recur?

A: The regulatory label instructs that the oral tablets must be taken consistently with food for optimal absorption. No specific foods or dietary groups are listed as being restricted or needing to be avoided while taking this medicine.

Q: Is Recur a controlled substance?

A: Official regulatory drug registries confirm that Recur (Finasteride) is not classified as a controlled substance by the Drug Enforcement Administration (DEA) or other major regulatory bodies. It is listed as a Prescription-Only Medication (POM).

Q: What is the difference between Recur and a placebo, according to studies?

A: Clinical trials reported that Recur showed statistically significant improvement compared to placebo (an inactive substance) across the study endpoints. These improvements included reduced Lower Urinary Tract Symptoms (LUTS) in BPH patients and increased Target Area Hair Count (TAHC) in alopecia patients.

Q: Does Recur require any special testing before starting treatment?

A: Official prescribing information advises that an appropriate evaluation should be done before starting therapy to rule out other possible conditions, especially for BPH. Additionally, the label mandates periodic monitoring, such as Complete Blood Counts (CBCs) and PSA monitoring, throughout the treatment period.

Q: Can Recur cause hair loss?

A: Recur is an approved treatment for androgenetic alopecia (male pattern hair loss). Hair loss is not listed as a frequent adverse reaction in the product information when the drug is used for its approved indications. Any unusual or sudden hair changes should be reported to a healthcare provider.

Q: How often do people need follow-up appointments when taking Recur?

A: Regulatory documents mandate that patients require periodic monitoring of laboratory values, such as CBCs, especially during the initial phase of treatment. The exact schedule and frequency of clinical follow-up is not specified in the drug label and is generally customized to the patient by the prescribing healthcare professional.

Q: Are there specific warnings about Recur and driving or operating machinery?

A: Official product information does not include specific prohibitions against driving or operating machinery. However, patients should be aware that the medicine can cause side effects like dizziness or somnolence (sleepiness) that could potentially affect their ability to perform these tasks safely.

Q: Can Recur interact with birth control pills?

A: According to official regulatory studies, Recur did not affect the pharmacokinetics of common hormonal contraceptives (birth control pills). This includes those containing agents like ethinyl estradiol and levonorgestrel.

Q: Does Recur affect blood sugar levels?

A: Changes in blood sugar levels are not listed as a known or common side effect in the adverse reaction tables. Recur’s primary mechanism of action involves hormonal modulation (DHT reduction), which is not directly linked to the body's glucose regulation pathways.

Q: Does taking Recur affect my ability to donate blood?

A: Yes, regulatory health authorities and blood donation centers generally require a deferral period after taking Recur. This is typically one month after the last dose, because trace amounts of the medicine could potentially be harmful if transfused to a pregnant female recipient.

Q: Is it necessary to take Recur at the exact same time every day?

A: The regulatory label specifies that the medication should be taken once daily. While a window of several hours is allowed for a missed dose, taking the medication at approximately the same time each day is the general recommendation to help maintain consistent drug levels in the body.

Q: What is the recommended period for clinical review of Recur treatment?

A: The regulatory label indicates that patients require regular checks. For BPH, the monitoring of prostate-specific antigen (PSA) levels is commonly recommended after the first six months to account for the expected drug-related reduction in these values.

Q: Can Recur be taken if a person has certain mental health conditions?

A: Official product information advises that reports of depression and suicidal ideation have been associated with Recur. If there is a history of mental health conditions, a healthcare provider can discuss appropriate monitoring for new or worsening psychiatric symptoms.

Q: How long did the clinical trials for Recur last?

A: The duration of the pivotal clinical trials varied by condition. Studies supporting the use of Recur for BPH ranged up to four years, while clinical trials for androgenetic alopecia lasted between one and five years.

Q: Does Recur interact with alcohol?

A: Official product information indicates that there are no known clinically significant interactions between Recur and moderate alcohol consumption. However, both the medicine and alcohol can cause dizziness, and excessive alcohol use may interfere with the intended health benefits.

Q: Is there a possibility of becoming dependent on Recur?

A: Regulatory documents and postmarketing reports indicate that there is no evidence of abuse potential or physical dependence associated with the continuous use of Recur.

Q: What happens if I accidentally take more Recur than prescribed?

A: Official documents state that single doses up to 400 mg were tolerated by patients in clinical trials without significant adverse effects. However, no specific treatment is universally recommended for an overdose, and a healthcare provider should be consulted immediately if more than the prescribed amount is taken.

How should Recur be stored and disposed of?

Storage Conditions and Handling Requirements

Recur (Finasteride) must be stored at Controlled Room Temperature, specifically maintained between 20 to 25 C (68 to 77 F), and kept in a dry place. To maintain product stability, the tablets must be stored in the original container, which must remain tightly closed, and protected from light.

Safety and Disposal

Child safety is mandatory: the medicine must be stored out of the sight and reach of children. A critical handling rule states that women who are pregnant or may potentially be pregnant must not handle crushed or broken tablets. For disposal, unused or expired product must not be thrown away in household waste or flushed down the toilet. Patients are instructed to consult a pharmacist for guidance on how to properly discard the medicine to protect the environment.

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

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