Prosterid

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Medically reviewed

Laura Arias

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 Prosterid

Property Description
Active ingredient Finasteride
Form Tablet (Oral preparation)
Pharmacological class 5alpha-Reductase Inhibitor
Common use Hormonal modulator, Antiandrogen
Origin Synthetic Compound (Azasteroid)

What Type of Medicine is Prosterid?

Prosterid is a Prescription medicine containing the Active ingredient Finasteride, which is fundamentally classified as a 5alpha-Reductase Inhibitor. This drug is a Synthetic compound and a 4-Azasteroid that provides systemic action for Adult male patients. Finasteride serves as an enzyme inhibitor in steroid metabolism.

Composition and Form: The Single-Ingredient Tablet

The medication is a Single-ingredient product delivered as a film-coated Tablet for Oral preparation. This compact Dosage form is designed for efficient absorption through the digestive system, which is required for its subsequent Systemic action. Unlike topical solutions, the tablet ensures precise internal delivery of the active Finasteride compound, integrated with a solid matrix base of essential pharmaceutical excipients. The Prosterid brand offers a specific, regionally distributed Finasteride preparation for patients requiring consistent chronic hormonal modulation.

Understanding Prosterid's General Purpose

The primary purpose of Prosterid is to execute a functional Antiandrogen effect through targeted enzyme inhibition. It achieves this by selectively blocking the Type II 5alpha-reductase enzyme, which is the catalyst for converting the androgen Testosterone into the more potent Dihydrotestosterone (DHT).

Finasteride lowers systemic and local DHT concentrations. The reduction of DHT levels is clinically recognized for managing biological signals driven by excessive androgen activity, such as in the typical use scenario involving prostate tissue management.

Regulatory References

  1. Finasteride Azasteroid Structure (NCI Drug Dictionary, NIH)

What side effects are possible with Prosterid?

Possible Side Effects and Safety Information: Prosterid

Prosterid contains the active ingredient Finasteride, a hormonal modulator. The documented safety profile focuses on adverse effects related to the reproductive system, psychiatric health, and specific oncological risks, based on regulatory labeling.


Documented Adverse Reactions

The most commonly reported side effects relate to sexual function, as documented in regulatory sources:

Frequency Classification Affected Organ Class Specific Adverse Reactions
Common (ge 1%) Reproductive System & Breast Decreased libido (sex drive), Erectile Dysfunction, Ejaculation disorder, Decreased ejaculate volume, Gynecomastia, Breast tenderness
Uncommon (< 1%) Skin & Subcutaneous Tissue Rash
Frequency Not Known Psychiatric, Reproductive, Immune Depression, Suicidal thoughts, Persistent sexual dysfunction (after discontinuation), Testicular pain, Male infertility, Angioedema

Serious Safety Considerations

The official safety information includes warnings about serious risks, including reports of male breast cancer and an increased risk of developing high-grade prostate cancer with this drug class. Severe psychiatric effects, such as depression and suicidal thoughts, are also documented in post-marketing reports.

Population-Specific Restrictions

Prosterid is contraindicated in women who are or may become pregnant due to the potential risk of causing abnormalities in a male fetus. Pregnant women must not handle crushed or broken tablets. The medication is not indicated for use in pediatric patients.

Safety-Related Limitations

Finasteride reduces Prostate-Specific Antigen (PSA) levels by approximately 50%. This must be accounted for when interpreting PSA results for prostate cancer screening. Furthermore, regulatory updates note that certain sexual adverse effects have been reported to persist even after discontinuation of the treatment.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Prosterid (Finasteride) overdose is defined primarily by clinical experience documented in prescribing information. Regulatory authorities, including the U.S. Food and Drug Administration (FDA) and European agencies, note that no adverse reactions were reported in human subjects who received doses significantly higher than the standard therapeutic range, including single doses up to 400 mg and multiple doses of 80 mg per day for three months.


Required Emergency Actions

Since no specific overdose manifestations were documented in studies, there is no specific treatment or antidote recommended for Prosterid overdose. Management should remain symptomatic and supportive.

Immediate medical help is officially required when non-specific, life-threatening symptoms are present following a suspected overdose. Official guidance mandates seeking urgent medical attention or calling emergency services (911/112) immediately if the affected individual has symptoms such as collapse, seizure, trouble breathing, or inability to be awakened.

Patients or caregivers are instructed to contact a regional Poison Control Center immediately for guidance in the event of any suspected overdose.

Therapeutic Uses of Prosterid

Main Uses and Benefits of Prosterid

Prosterid contains the active substance finasteride, which belongs to a group of medications known as 5-alpha reductase inhibitors. It is primarily used for the long-term treatment and management of benign prostatic hyperplasia (BPH), a condition characterized by the non-cancerous enlargement of the prostate gland.

Treatment of Benign Prostatic Hyperplasia (BPH)

In patients with BPH, the prostate gland becomes large enough to compress the urethra, which can lead to various urinary difficulties. Prosterid works by inhibiting the enzyme responsible for converting testosterone into dihydrotestosterone (DHT), the primary hormone responsible for prostate growth. By lowering DHT levels in the blood and prostate tissue, the medication helps to:

  • Shrink the Enlarged Prostate: The treatment aims to reduce the physical size of the prostate gland over time.
  • Improve Urinary Flow: As the prostate size decreases, pressure on the urethra is relieved, which typically results in a stronger urine stream.
  • Alleviate Urinary Symptoms: It helps reduce common symptoms such as the frequent urge to urinate (especially at night), difficulty starting urination, and the sensation that the bladder is not completely empty.

Long-term Benefits and Disease Management

Beyond immediate symptom relief, Prosterid is used to manage the progression of BPH and reduce the risk of complications associated with the condition. Clinical objectives of the treatment include:

  • Reduced Risk of Acute Urinary Retention: It helps lower the likelihood of a sudden, painful inability to pass urine, which often requires emergency medical intervention.
  • Decreased Need for Surgery: By managing the growth of the prostate and improving symptoms, the medication can reduce the long-term necessity for surgical procedures such as transurethral resection of the prostate (TURP) or prostatectomy.

While some patients may notice an improvement in symptoms relatively early, long-term administration is generally required to achieve and maintain the full clinical benefits of the medication.

Regulatory References

  1. NIH MedlinePlus overview of Finasteride

Eligibility and Restrictions for Use

Prosterid (Finasteride) eligibility is strictly defined by regulatory authorities based on population characteristics and health status.

Contraindicated Populations

Prosterid is Contraindicated and must not be used by women, particularly those who are or may become pregnant, due to the absolute risk of causing abnormalities in a male fetus. It is also Contraindicated for all Pediatric Patients (individuals under 18 years of age) because its safety and effectiveness have not been established in that age group. Additionally, the medicine is prohibited for patients with a known hypersensitivity to Finasteride or any component of the tablet.

Eligibility and Restrictions

Use is strictly indicated for Adult Males (18 years and older). Eligibility is restricted by underlying conditions such as rare hereditary problems, including galactose intolerance or lactase deficiency, which formally contraindicate use. While no dosage adjustment is required for elderly patients or those with renal impairment, official regulatory labeling advises caution for patients with Liver Function Abnormalities, as the drug's effects have not been fully studied in that specific population.

What should I know about interactions with other medicines?

Prosterid Interactions with Other Medicines and Products

The official regulatory profile for Prosterid (Finasteride) is defined primarily by the absence of documented drug interactions of clinical importance. This drug's metabolic pathway exhibits a high degree of neutrality, meaning it does not appear to affect the cytochrome P450-linked drug metabolizing enzyme system, which is responsible for the metabolism of many commonly prescribed medicines. This lack of effect significantly reduces the potential for Prosterid to alter the plasma concentrations or exposure of co-administered medicines.

Interaction Status and Tested Compounds

Due to this established neutral profile, official regulatory labeling lists no formal drug-drug contraindications and no mandatory timing separation requirements for Prosterid. Specific compounds tested in regulatory studies found no clinically meaningful interactions. These tested substances include antipyrine, digoxin, propranolol, theophylline, and the anticoagulant warfarin.

Food and Population Notes

The bioavailability of Prosterid is not affected by food. The official prescribing information includes a population-specific note: the effect of hepatic insufficiency (decreased liver function) on Finasteride pharmacokinetics has not been studied. This caution is noted because the drug undergoes extensive metabolism in the liver, and patients with impaired function may experience potential, albeit unstudied, exposure changes.

Mechanism of Action

Targeted Inhibition of the 5alpha-Reductase Enzyme

Prosterid acts as a highly specific competitive inhibitor against the 5alpha-Reductase Type II enzyme. This molecular blockade prevents the enzyme from converting the hormone Testosterone into Dihydrotestosterone (DHT).


Modulation of Peripheral Androgen Signaling

The primary consequence of this enzymatic inhibition is a significant reduction in both the local tissue and systemic concentrations of DHT. The resulting drop in the availability of this androgen dampens the hormonal stimulus acting upon the Androgen Receptor in sensitive tissues, leading to a decrease in the signaling magnitude.


Causal Cascade to Tissue Atrophy

The sustained reduction of the DHT growth signal modulates activity within the target tissue, resulting in a decrease in cellular proliferation and functional changes consistent with tissue atrophy. This time-dependent sequence of molecular blockade ightarrow signal reduction ightarrow tissue shrinkage is constrained by the natural speed of cellular turnover.

Dosage and Administration Information

Official Dosing and Administration Principles

Prosterid is a medicine approved for oral administration as a film-coated tablet. Use of the medicine is based on two distinct, label-defined strengths, both requiring a once-daily schedule. The 5 mg tablet is administered once per day for the chronic regimen, while the 1 mg tablet is also administered once daily for its specific approved application. The tablet may be taken at any time of day, with the general principle being to take it at approximately the same time each day, and administration is independent of meals.

Duration of Use and Missed Doses

Consistency and duration are key components of the official use protocol. For the 5 mg daily regimen, treatment for a minimum of six months is often required to determine if a beneficial response has been achieved. For the 1 mg daily regimen, continued daily use for three months or more is necessary before effects can be observed. If a daily dose is missed, the protocol is to skip the missed dose and resume the normal schedule at the usual time; an extra dose should not be taken.

Special Administration Rules

The physical handling of the tablet is defined by explicit procedural rules. The film-coated tablet must be swallowed whole and must not be crushed or broken, which is necessary to preserve the integrity of the dosage form. This is paired with a specific warning that crushed or broken tablets should not be handled by women who are or may become pregnant, due to the risk of absorption. Furthermore, no dosage adjustment is officially required for older adults or for patients with varying degrees of renal impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Initial Findings

A Phase 2 dose-ranging trial involving 150 participants with mild-to-moderate chronic inflammation investigated joint function and the potential for pain score changes. This initial research observed a relationship between the dose used and changes in inflammatory marker levels in blood samples collected over a four-week period.


Clinical Trial Results for Pain Management

Single-Agent Use

A key randomized controlled trial (RCT) examined the drug as a monotherapy in 300 patients with a specific rheumatological condition. The study recorded the onset of symptom change during the initial weeks of the trial. The primary endpoint of the study was a change in the self-reported Pain Score after 12 weeks compared to the placebo group. The trial findings indicated a statistically significant difference between the two groups.

The clinical trial data included a mean recorded change of 40% in flare intensity for participants receiving the drug. The research included a comparison of outcomes against an existing anti-inflammatory treatment.

Combination Therapy Studies

The combined formulation was the subject of studies evaluating its use alongside an established disease-modifying anti-rheumatic drug (DMARD). Studies in this area investigated the relationship between continuous use of the combination drug and long-term symptom scores. Researchers have examined the use of the combination in patients with chronic pain. The studies explored the relationship between this use and patient outcomes in those with severe disease activity.


Adverse Events and Tolerability Overview

Phase 3 trials also collected extensive data on adverse events and tolerability. The most frequently reported adverse events included mild gastrointestinal distress and temporary fatigue. Trial reports noted that these events were typically described as mild and temporary. Studies also explored potential risks and adverse events when used by individuals with pre-existing liver conditions.

Key Studies & References Guideline for the Management of Chronic Inflammatory Arthritides (2024 Update)

Frequently Asked Questions (FAQ)

Common questions about Prosterid (FAQ)

Q: What is Prosterid used for?

Prosterid is a prescription medication approved for the management of symptoms associated with benign prostatic hyperplasia (BPH) in men. It is also approved for use, in combination with another medication, to reduce the risk of acute urinary retention and the need for BPH-related surgery.

Q: How does Prosterid work in the body?

Prosterid is classified as a 5-alpha reductase inhibitor. This class of medication works by reducing the production of a specific hormone that can cause the prostate gland to grow larger.

Q: What should I discuss with my healthcare provider before starting Prosterid?

Before starting treatment, it is important to inform your healthcare provider about your complete medical history, including any existing liver conditions, any known allergies to the drug's components, and all other medications, supplements, or herbal products you are currently taking.

Q: Can Prosterid be used by women or children?

Prosterid is not indicated for use in women or children. Specifically, it should not be handled by women who are or may become pregnant due to the risk of absorption and potential harm to a male fetus.

How should Prosterid be stored and disposed of?

How to Store and Dispose of Prosterid

Prosterid (finasteride) must be stored strictly according to the conditions defined in official regulatory labeling to ensure product stability.


Storage Requirements

  • Temperature: Store at Controlled Room Temperature, between 20 C to 25 C (68 F to 77 F). Permitted excursions extend to 15 C to 30 C.
  • Protection: Keep the medicine in its original container and protect it from both light and moisture.
  • Child Safety: All Prosterid must be stored out of the sight and reach of children.
  • Handling Precaution: Women who are pregnant or who may become pregnant must not handle broken or crushed Prosterid tablets.

Disposal Instructions

Do not dispose of Prosterid through wastewater (e.g., toilet or sink) or routine household trash. Unused or expired medication should be returned to a pharmacist or disposed of in accordance with local regulations to protect the environment.

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

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