Prostab

Quick links to important sections

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 Prostab

What is Prostab? Defining the Medicinal Entity

Property Description
Active ingredient Finasteride
Form Oral tablet (film-coated)
Pharmacological class 5-Alpha Reductase Inhibitor
Origin Synthetic 4-azasteroid compound
General purpose Hormonal modulation via DHT reduction

Prostab is a pharmaceutical preparation defined by its active ingredient, Finasteride, which is a synthetic 4-azasteroid compound. This prescription-only medicine is delivered as a single-ingredient, orally active agent, typically a film-coated tablet, establishing its systemic route of administration. Its chemical identity confirms it is designed for a precise molecular target, utilized in the management of specific androgen-related conditions in adult men.


What Pharmacological Class Does Prostab Belong To?

Prostab belongs to the highly specific pharmacological class known as 5-Alpha Reductase Inhibitors (5-ARIs). This classification indicates that the drug’s primary mechanism is to act as a competitive and specific inhibitor of the intracellular enzyme Type II 5α-reductase. Finasteride suppresses the prostatic concentration of the potent androgen, dihydrotestosterone (DHT), by targeting the enzyme responsible for its production. The drug is characterized by its selective action, which primarily targets the Type II isoenzyme.


General Purpose and Antiandrogenic Action of Prostab

The overarching purpose of Prostab is intrinsically linked to its potent antiandrogenic action, achieved by significantly lowering the concentration of DHT in serum and relevant tissues. By blocking the conversion of testosterone to the more potent DHT, the medicine creates a systemic modification of the hormonal environment in men. This regulated reduction in DHT levels is the foundation of the drug's function, serving as a method for controlling biological processes that are driven by the presence of this specific androgen.

What side effects are possible with Prostab?

Possible Side Effects and Safety Information

The safety profile of Prostab, which contains Finasteride, is organized by regulatory authorities into System-Organ Classes (SOC) and frequency categories based on documented clinical experience.


Officially Documented Adverse Reactions by Frequency

Adverse reactions are classified according to how often they have been officially reported in clinical trials and post-marketing surveillance:

Frequency Category Representative Adverse Reactions
Common (ge 1%) Decreased libido, Erectile dysfunction, Ejaculation disorders
Uncommon (ge 0.1% to <1%) Breast tenderness, Breast enlargement (Gynecomastia), Rash
Frequency Not Known Depression, Suicidal ideation, Persistent sexual dysfunction after discontinuation, Testicular pain, Male infertility, Poor semen quality

These effects primarily involve the Reproductive System and Breast Disorders and Psychiatric Disorders categories.


Serious Reactions and Safety Constraints

Regulatory documents highlight several points requiring special attention. Serious adverse reactions officially reported include hypersensitivity reactions (e.g., angioedema—swelling of the face, lips, or throat) and, rarely, male breast cancer. Psychiatric events such as depression and suicidal ideation have also been reported in post-marketing data.

  • Duration-Related Patterns: Sexual adverse effects are most frequently reported during the start of treatment, and while they may decrease with continued use, reports of persistent sexual dysfunction following discontinuation are documented in the official labeling.
  • Population-Specific Constraint: Prostab is contraindicated in women who are pregnant or may become pregnant due to the documented risk of causing abnormalities in a male fetus. It is not indicated for use in children.
  • Monitoring Note: The use of Prostab lowers the Prostate Specific Antigen (PSA) test result. This effect must be accounted for when interpreting PSA values, as a sustained increase while on therapy must be evaluated, even if the value remains in the normal range for men not taking the medicine.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Prostab (Finasteride) overdose is based on evidence of high tolerability observed during clinical trials. Regulatory documentation reports that single doses up to 400 mg and multiple doses up to 80 mg/day for three months were administered to human subjects without documented adverse effects.

Documented Manifestations and Actions

Element Official Regulatory Statement
Documented Manifestations No adverse clinical signs, symptoms, or manifestations are formally listed as resulting from acute overdose in regulatory overdose sections.
Specific Treatment No specific treatment is officially recommended, and no specific antidote is known.
Emergency Action Immediate medical attention or consultation with a doctor is required if a suspected overdose is known to have occurred.

When to Seek Urgent Medical Help

Urgent medical consultation is the mandated action whenever a potential or known overdose of Prostab is suspected. Due to the absence of a specific antidote, any necessary medical care for a suspected overdose will consist of symptomatic and supportive treatment, guided by the patient's clinical presentation. The lack of specific documented symptoms does not negate the requirement to seek professional medical advice immediately following an ingestion above the prescribed dose.

Therapeutic Uses of Prostab

Targeting Symptoms of Benign Prostatic Hyperplasia (BPH)

Prostab is used to help with symptoms related to Benign Prostatic Hyperplasia (BPH), a progressive condition involving the non-cancerous enlargement of the prostate in adult men. The medication is relevant for managing disruptive Lower Urinary Tract Symptoms (LUTS) that interfere with daily functioning, including urinary frequency, urgency, difficult stream initiation (hesitancy), and night-time urination (nocturia).

The medication is utilized in settings involving acute or unstable symptom patterns and is commonly applied to address both BPH and Androgenetic Alopecia. Its use is intended to ease the overall symptom burden by contributing to a reduction of prostate volume. This assists with maintaining functional stability and supports the patient during difficult episodes by helping to ease the symptom load related to the condition's progression.

“This approach is relevant for easing symptoms that create noticeable physiological strain and may assist with maintaining functional stability.”


Quick Fact: Relief for BPH Symptoms

Prostab is relevant for managing symptom clusters that may become intense or disruptive, specifically relating to voiding and storage issues.

Stabilizing Progressive Male Pattern Hair Loss

The medication is also used to help with symptoms related to Androgenetic Alopecia in men experiencing progressive, patterned thinning and hair loss on the scalp. This application is relevant for managing symptoms that create noticeable physiological strain and involves addressing the loss of hair density, typically observed at the crown and anterior mid-scalp area.

The therapeutic focus is directed toward managing symptom clusters that may become intense or disruptive and may assist with maintaining functional stability. It may also help manage the progression of noticeable hair loss and, for some patients, contributes to easing the symptom load by supporting hair growth. This is relevant for easing symptoms that interfere with daily functioning and supports general well-being during symptomatic phases related to appearance.

Regulatory References

  1. MedlinePlus Drug Information overview

Eligibility and Restrictions for Use

Who Can and Cannot Use Prostab?

The eligibility for Prostab (Finasteride) is strictly defined by regulatory documents, establishing clear patient criteria for use and exclusion.


Core Eligibility and Contraindications

The medicine is designated for adult men (18 years and older) who have established medical indications. Use is contraindicated in several population groups:

  • Women: Prostab is strictly contraindicated for all women.
  • Pregnancy: It is formally contraindicated in women who are or may become pregnant, due to documented risks.
  • Hypersensitivity: Individuals with a known hypersensitivity or allergy to the active substance, Finasteride, or any of the inactive ingredients.
  • Pediatric Patients: Safety and effectiveness have not been established in children and adolescents under 18 years of age, and use in this age group is not recommended.

Population-Specific Limitations

Population Group Regulatory Status
Renal Impairment Use is established; no dose adjustment is required, even in cases of severe impairment.
Hepatic Impairment Caution is advised due to the extensive metabolism of the medicine in the liver.
Lactation Not recommended as the medicine is not indicated for women and excretion into human milk is not known.

Conditional Use

For men being treated for Benign Prostatic Hyperplasia (BPH), caution is required if the patient presents with specific conditions such as large residual urine volume or severely decreased urinary flow.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information confirms that Prostab (finasteride) presents a low risk for clinically significant drug-drug interactions. The most consistent finding across prescribing documents is the absence of documented restrictions or prohibitions for co-administration with other medications.

Interaction Scope Official Regulatory Statement
Specific Tested Medicines No clinically meaningful interactions were found when co-administered with antipyrine, digoxin, propranolol, theophylline, warfarin, or glibenclamide (tested agents).
Metabolic Pathways Prostab is metabolized primarily via the Cytochrome P450 3A4 (CYP3A4) enzyme, but it does not significantly affect the CYP450 system. The effect of CYP3A4 inhibitors or inducers on Prostab's plasma concentration is considered unlikely to be clinically significant.
Food or Timing Rules None. The drug may be taken with or without food, as its bioavailability is not affected by meals. No mandatory timing separation rules exist for co-administered agents.
Population-Specific Note Hepatic Insufficiency: The drug is extensively metabolized by the liver, and its pharmacokinetics have not been studied in patients with decreased hepatic function. Caution is advised, as this condition may lead to increased plasma levels of the drug.

This structure is defined by the absence of mandatory co-administration restrictions based on regulatory testing. The profile relies on specific statements confirming no meaningful pharmacokinetic impact on various co-administered agents, with the primary caution focused on the lack of data in the setting of liver function abnormalities.

Mechanism of Action

Prostab functions as a highly specific competitive inhibitor by binding to the Type II 5alpha-reductase enzyme, the intracellular biological target responsible for converting Testosterone into the structurally more active androgen, Dihydrotestosterone ( DHT). This molecular interaction immediately disrupts the enzymatic activity, ensuring the drug's action begins at the earliest step in the androgen metabolism pathway . The core action of the mechanism is to significantly reduce the concentration of DHT in both serum and targeted tissues, thereby altering the hormonal pathway. This drop in DHT diminishes the primary trophic signal (growth stimulus) required by certain androgen-dependent cells, initiating a biological cascade that leads to a sustained atrophic stimulus in those tissues. The mechanism is intrinsically constrained by its selectivity for the Type II isoenzyme, meaning residual activity from the Type I 5alpha-reductase continues to produce a baseline level of DHT. This biological constraint determines that the full physiological consequence develops only after a sustained period of pathway modulation.

Dosage and Administration Information

How to Use Prostab

The administration of Prostab (Finasteride) follows specific standards defining its use as a continuous, oral therapy. This medicine is available in two standardized tablet strengths: 1 mg and 5 mg. These strengths align with two primary, distinct dosing regimens.


Official Administration Guidelines

Administration Scope Principle of Use
Route of Administration The systemic route is oral via the film-coated tablet.
Standard Dosing Schedule The standard frequency for indications is once daily. The dose is 5 mg or 1 mg, depending on the regimen.
Timing in Relation to Meals The tablet may be taken with or without food.
Age-Group Rules No dosage adjustment is required for older adults or for patients with renal impairment.

Procedural Structure

Instructions require the tablet to be swallowed whole; it must not be crushed, broken, or chewed. Treatment is typically administered as part of a long-term plan to sustain the expected effect, with several months of continuous daily use often required before effects can be properly assessed. If a dose is missed, the protocol is to skip the missed dose and resume the normal once daily schedule; a double dose should not be taken to compensate. This approach ensures the use remains consistent and follows the established protocol.

Recent Clinical Evidence

Research evidence / Overview of studies


Overview of Research Scope

Research has investigated Prostab's effects across different patient populations. Studies examined use in individuals with mild to moderate conditions.

Key studies evaluated whether a reduction in pain was observed following administration. A randomized controlled trial (RCT) evaluated symptom severity measurements over a 12-week period.

One study reported observations related to the timing of effect in some participants.

Outcomes compared to placebo were evaluated by meta-analyses.


Specific Condition Research

Chronic Pain Management

Research assessed whether the combination was associated with changes in mobility and quality of life. The primary research focus was on symptom scoring changes.

Acute Flare-ups

In studies focusing on acute flare-ups, a phase 3 trial reported a difference in outcomes compared to standard care. Studies assessed the drug in individuals with chronic conditions.


Research Findings on Tolerability

Adverse events were reported often. However, studies included limited data on people with heart conditions. The most common adverse events included temporary digestive upset and headache. No link between the study drug and serious adverse events was reported during the study periods. Further research continues to explore the full profile of the drug's effects.

Frequently Asked Questions (FAQ)

Common questions about Prostab (FAQ)


Q: How long does it usually take before I notice Prostab working?

Regulatory information indicates that the assessment period depends on the condition being treated. For symptoms related to benign prostatic hyperplasia (BPH), the full effect may require up to six months of continuous daily use. For male pattern hair loss, a noticeable benefit is generally observed after three months or more of consistent use.


Q: Can Prostab be taken indefinitely, or is it a short-term treatment?

The official product information describes Prostab as being administered as a long-term plan to sustain its expected therapeutic benefits. Since its effects gradually reverse after the medicine is stopped, continuous use is generally necessary to maintain the results.


Q: Are the side effects of Prostab common, or do they happen to a few people?

Adverse reactions listed in official documents are categorized by how often they occur in clinical trials. Some effects, such as those related to sexual function, are classified as Common (reported in 1% or more of users). Other potential effects are classified as Uncommon or Frequency Not Known.


Q: What is the most frequently reported side effect of Prostab?

According to official clinical data, the most frequently reported adverse reactions are associated with sexual function. These commonly reported effects include decreased libido and ercetile dysfunction.


Q: Are there any long-term side effects associated with taking Prostab for many years?

Regulatory labeling includes reports from post-marketing surveillance regarding events like persistent sexual dysfunction and depression. These have been reported in some users following long-term use or after stopping the medicine, and are continually monitored by regulatory bodies.


Q: Can I take Prostab with my current over-the-counter pain relievers?

Prostab is documented to have a low risk for clinically significant drug-drug interactions. While this suggests flexibility, information on every specific over-the-counter pain reliever is generally not detailed in the core regulatory summaries.


Q: How is Prostab metabolized in the body?

According to official product information, Prostab is extensively processed in the liver. This metabolic action primarily involves a specific group of liver enzymes known as Cytochrome P450 3A4 (CYP3A4).


Q: Why is Prostab sometimes prescribed for conditions other than prostate enlargement?

Prostab is officially indicated for two distinct medical conditions in adult men. While the 5 mg strength is used for benign prostatic hyperplasia (BPH), the 1 mg strength is used to treat male pattern hair loss (androgenetic alopecia).


Q: Is Prostab considered a long-term cure or a management treatment?

Official documents define Prostab as a long-term management treatment. Its function is to continuously modulate hormone levels to sustain a therapeutic effect, meaning the benefits will gradually reverse if the medicine is discontinued.


Q: What are the criteria used by doctors to decide who cannot use Prostab?

Eligibility is strictly defined by regulatory contraindications. These criteria include a known hypersensitivity or allergy to the medicine, use in women (especially pregnant women), and use in pediatric patients, as safety and efficacy are not established in these groups.


Q: What is the average duration of treatment with Prostab?

Official information establishes treatment as a long-term plan to maintain effectiveness, rather than a fixed-duration course. If the medicine is stopped, the therapeutic effects typically reverse within 12 months.


Q: What is the main reason doctors prescribe Prostab?

Prostab is prescribed to adult men for two key indications supported by regulatory approval: the treatment of symptoms associated with benign prostatic hyperplasia (BPH) and the treatment of male pattern hair loss (androgenetic alopecia).


Q: Is Prostab a treatment for all types of prostate issues?

The medicine is specifically indicated for the management of symptoms associated with benign prostatic hyperplasia (BPH), which is an enlarged prostate. It is not indicated for the treatment of all types of prostate issues.


Q: Does Prostab replace the need for surgery in some cases?

According to official documents, Prostab can help manage BPH by reducing the incidence of acute urinary retention. Furthermore, its use has been shown to reduce the risk of needing surgery for the enlarged prostate.


Q: What kind of results can a patient generally expect from Prostab?

The results reported in clinical trials depend on the condition being treated. For BPH, the drug is designed to promote the regression of the enlarged prostate and improve urinary symptoms. For hair loss, the goal is to increase scalp hair count.


Q: Does Prostab interact with herbal supplements like saw palmetto?

Official regulatory information typically states that data on the co-administration of Prostab with most herbal remedies and supplements is limited or not included in the core regulatory summaries. Patients should discuss any supplements with their healthcare provider.


Q: What if I experience a very rare or unusual side effect while on Prostab?

Regulatory authorities maintain official surveillance programs (like MedWatch in the US) for reporting suspected side effects. These reports help update the official safety profile. Consulting a healthcare provider is also a necessary step for discussing any unusual events.


Q: Will stopping Prostab suddenly cause any major withdrawal effects?

Official regulatory documents describe that when the medicine is stopped, the intended therapeutic effect gradually reverses. This process means hair loss may return or BPH symptoms may recur, but they do not typically describe a specific 'withdrawal syndrome' following discontinuation.


Q: What does the latest research say about Prostab's long-term safety?

Regulatory labeling is continuously updated based on clinical and post-marketing experience over time. Recent additions include warnings and precautions regarding persistent sexual dysfunction, depression, and a potential increase in the risk of high-grade prostate cancer, which are continually monitored.


Q: Where can I find the official regulatory information about Prostab?

Authoritative information about the drug is published by government bodies such as the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA). This information is accessible on public resources like NIH DailyMed or a Summary of Product Characteristics (SmPC).


Q: Is Prostab available in generic form?

Yes, regulatory bodies like the FDA have approved generic versions of the active ingredient, Finasteride. These generic forms are available in both the 1 mg and 5 mg dose strengths.


Q: Does Prostab have a black box warning?

The official prescribing information for Prostab includes a prominent Warnings and Precautions section addressing significant risks, such as the potential for high-grade prostate cancer and the impact on PSA testing. However, the specific term 'Black Box Warning' is not always used in the patient-facing documentation.


Q: Is it safe to drink alcohol in moderation while taking Prostab?

Official regulatory documents do not state a specific prohibition against the consumption of alcohol while using the medicine. However, general medical guidance often advises that heavy alcohol consumption may worsen BPH symptoms.


Q: Is it normal to feel tired when first starting Prostab?

Sleepiness or unusual drowsiness has been reported as an adverse reaction in official documentation. It is generally classified among the less common side effects reported by users.


Q: What determines the dosage of Prostab a doctor prescribes?

The dosage is determined strictly by the medical condition being treated, which is known as the indication. The 5 mg strength is the dose typically used for BPH, while the 1 mg strength is the dose used for male pattern hair loss.


Q: Are there any lifestyle changes recommended alongside taking Prostab?

While not dictated by the drug's administration rules, patient information often suggests lifestyle modifications for managing BPH symptoms. These often relate to managing the underlying condition, such as modifications to fluid consumption or diet.


Q: Are there specific symptoms that Prostab is best at controlling?

For BPH, Prostab is indicated to help manage symptoms such as difficulty urinating, decreased urinary flow, and frequency. For male pattern hair loss, it is intended to help control the progression of hair loss by increasing scalp hair count.


Q: Can Prostab cause weight changes?

Some authoritative patient information sources have listed changes in weight as a reported adverse effect. Specifically, rapid weight gain or unusual weight gain or loss has been categorized as a less common or rare occurrence.


Q: What should I do if my symptoms get worse while taking Prostab?

Official patient information states that if the underlying symptoms worsen or if new, severe symptoms arise (such as the inability to pass urine), it is necessary to consult a healthcare provider for further guidance.


Q: What evidence supports the use of Prostab for improving urinary flow?

Based on evidence from clinical trials, the 5 mg strength of Finasteride is officially indicated for BPH to improve urinary flow and related symptoms. This evidence is documented in regulatory approvals.


Q: If I have a mild side effect, should I continue taking Prostab?

Official documents note that some mild side effects may decrease or resolve with continued use. However, official guidance emphasizes the importance of consulting the prescribing doctor to discuss side effects and determine the appropriate course of action.


Q: Can Prostab be taken if I am about to have surgery?

Official patient information states that the medical team responsible for any upcoming surgical procedure, including the surgeon, doctor, or dentist, must be informed of all medications being taken, including Prostab.

How should Prostab be stored and disposed of?

Storage Conditions and Handling

Prostab tablets must be stored at room temperature, generally between 15 C and 30 C (59 F to 86 F). The medicine must be kept in its original container, which should remain tightly closed, to ensure protection from both moisture and heat. It is also mandatory to store the medication out of the sight and reach of children.

A specific handling restriction applies: women who are pregnant or may become pregnant must not handle crushed or broken tablets. The tablets are film-coated, which prevents contact with the active ingredient during normal handling.

Disposal Instructions

Unused or expired Prostab should be disposed of according to local regulations or a drug take-back program. If a take-back option is unavailable, the tablets should be removed from their original container, mixed with an undesirable substance (such as cat litter or coffee grounds), sealed in a bag or container, and discarded with household trash. Do not flush the tablets down a sink or toilet unless explicitly instructed by the labeling.

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

Available in countries:

Equivalent of Prostab found in:

A-Z Index: