Nilutamide

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Nilutamide

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Treatment option: Cancer, Cancer,Prostate

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 Nilutamide

What is Nilutamide?

Nilutamide is an oral medication primarily used in the treatment of prostate cancer. It belongs to a class of drugs known as nonsteroidal antiandrogens. This medication is typically used in combination with surgical or chemical castration to manage advanced stages of the disease.

Mechanism of Action

To understand how nilutamide works, it is important to understand the role of hormones in prostate cancer. Most prostate cancer cells rely on male sex hormones, such as testosterone, to grow and divide. These hormones, collectively known as androgens, bind to specific receptors within the prostate cells.

Nilutamide works by blocking these androgen receptors. By occupying the receptor sites, it prevents testosterone and other androgens from attaching to the cancer cells. This effectively "starves" the cancer cells of the hormonal signals they need to proliferate, which can lead to a reduction in tumor size or a slowing of the disease progression.

Clinical Context

In the management of prostate cancer, nilutamide is specifically indicated for use following surgical removal of the testes (orchiectomy). When the testes are removed, the primary source of testosterone is eliminated; however, the adrenal glands continue to produce small amounts of androgens. Nilutamide is used to counteract the effects of these remaining adrenal androgens, providing what is often referred to as a complete androgen blockade.

Physical Properties

Nilutamide is a synthetic compound. As a nonsteroidal agent, its chemical structure differs from the steroid hormones it competes with, which helps it target androgen receptors specifically without activating other types of hormone receptors in the body.

Regulatory References

  1. MedlinePlus

What side effects are possible with Nilutamide?

Possible Side Effects and Safety Information

Nilutamide carries a significant risk profile, which is highlighted by a Black Box Warning from the U.S. Food and Drug Administration (FDA) regarding Interstitial Pneumonitis. This is a serious, potentially fatal lung condition that has been reported in patients treated with Nilutamide, most often within the first three months of therapy. Due to this risk, the drug is contraindicated in patients with severe respiratory insufficiency, and a baseline chest X-ray is required before starting treatment.


Serious and Clinically Significant Risks

Another major risk is Hepatotoxicity, including severe liver injury and rare cases of fatal hepatic failure, generally occurring within the first four months of treatment. Nilutamide is contraindicated in patients with severe hepatic impairment. Liver function tests (LFTs) must be closely monitored throughout treatment; significant elevation of liver enzymes (e.g., ALT or AST >2 times the upper limit of normal) requires immediate discontinuation and follow-up.


Common Adverse Reactions and Limitations

Common adverse reactions, occurring in 10% or more of patients, include hot flashes, testicular atrophy, and altered adaptation to dark (difficulty adjusting vision when moving from light to dark). Patients experiencing altered dark adaptation should use caution when driving at night or through tunnels, and wearing tinted glasses may help alleviate this effect. Other common effects include nausea, constipation, and dizziness.

Alcohol intolerance (a disulfiram-like reaction) can occur, causing flushing, weakness, and hypotension; therefore, avoiding alcoholic beverages is recommended for patients who experience this reaction. Nilutamide is for use only in men and is contraindicated in women, particularly those who are or may become pregnant.

Overdose and Emergency Response

Overdose Scope

Feature Official Regulatory Statement
Documented Overdose Presentations Symptoms documented following significant overdosage include nausea, vomiting, headache, and dizziness. Ingestion of a massive dose has been reported without immediate clinical signs.
Physiological Systems Affected (as stated in label) Gastrointestinal and Central Nervous Systems. Monitoring of hepatic enzymes (transaminases) is suggested due to potential elevation at high doses.
Dose-related or Exposure-related Factors (if applicable) Overdosage cases have been managed with procedural steps aimed at reducing absorption.
Population-specific Overdose Notes (if applicable) Dialysis may not be useful as a treatment measure due to the drug's extensive protein binding.
Emergency-response statements (as written in official documents) Management requires general supportive care, close observation, and frequent monitoring of vital signs. Procedural steps include gastric lavage and the oral administration of activated charcoal.
When immediate medical help is required (label-derived phrasing only) Seek medical care right away if an overdose is suspected. Call 911 immediately if the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened.

Overdose Classifications (High-Level)

Classification Official Regulatory Statement
Severity classification (as defined in official documents) The clinical profile is managed with symptomatic care; no specific antidote is known.
Regulatory basis (EMA / FDA / etc.) Based on official U.S. FDA Prescribing Information and NIH MedlinePlus Drug Information.
Overdose-context constraints (as defined in official documents) The absence of a known antidote and limited utility of dialysis structurally constrain management to supportive measures.

Resulting Overdose Structure

Official overdose statements:

  • Overdosage is officially associated with gastrointestinal and CNS effects, including nausea, vomiting, headache, and dizziness.
  • Management requires immediate general supportive care, including close observation and frequent vital sign monitoring.
  • Immediate Call 911 or contact with a poison control center is required if severe acute signs, such as collapse or seizure, are present.
  • There is no specific antidote known for Nilutamide overdosage.
  • Due to the extent of protein binding, standard medical procedures like dialysis are not considered useful.

Connection to the overall overdose profile: Regulatory documents define the Nilutamide overdose profile by a set of non-specific clinical manifestations and the clear absence of a known antidote. This structure mandates that all emergency management procedures focus exclusively on symptomatic and supportive treatment, including monitoring and physical interventions as needed. Urgent medical attention is required when the overdosage leads to severe, acute, or life-threatening manifestations, as explicitly instructed by government guidance.

Therapeutic Uses of Nilutamide

What Nilutamide Treats: Main Uses and Benefits

Nilutamide is a specialized hormonal agent commonly used in the systemic management of advanced, metastatic prostate cancer. This medication may be used after surgery to help manage this condition. Its therapeutic role is primarily within oncology, and is relevant in addressing hormone-sensitive **conditions presenting with systemic or localized discomfort.


Managing Symptom Domains

Nilutamide is primarily applied in clinical settings that require long-term support for managing advanced disease progression. The medication contributes to easing the overall symptom load and supports general well-being during these symptomatic phases. This includes its role in managing symptoms that become more disruptive during flare-ups, such as sudden increases in bone pain or pronounced urinary difficulty. It assists with maintaining a sense of stability when symptoms interfere with daily functioning during the transition phases of therapy.


Quick Fact: Support for Acute Symptom Flare-ups
Nilutamide is often used in situations where symptoms may intensify temporarily, and provides supportive relief when symptoms escalate temporarily.

Regulatory References

  1. MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who Can and Cannot Use Nilutamide? (Official Regulatory Information)

Nilutamide is subject to strict eligibility rules, restricting its use exclusively to adult males (18 years of age or older) with metastatic prostate cancer, as established in regulatory documents. Treatment must be initiated in combination with surgical castration.


Absolute Contraindications

Official regulatory bodies explicitly prohibit the use of Nilutamide in several population groups. The medicine is contraindicated in:

  • Women/Females and Children (pediatric patients under 18 years of age).
  • Patients with severe hepatic impairment (severe liver disease).
  • Patients with severe respiratory insufficiency (severe lung disease).
  • Individuals with a known hypersensitivity to nilutamide or any component of the drug.

Conditional Use and Restrictions

Eligibility is conditional upon specific health monitoring. Treatment requires a mandatory baseline evaluation of hepatic enzymes and regular monitoring during therapy. Furthermore, patients who experience intolerance to alcohol, such as flushing or hypotension, are officially advised to avoid alcoholic beverages.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Regulatory documentation defines Nilutamide's interaction profile primarily through pharmacokinetic inhibition of metabolic enzymes. Nilutamide is documented to inhibit the activity of liver cytochrome P-450 isoenzymes, which may reduce the metabolism of co-administered medicines that are cleared through these enzyme systems.

Documented Exposure-Modifying Interactions

Co-administered Product Category Interaction Outcome
Compounds with Low Therapeutic Margin Delayed elimination; potential for increased plasma concentrations.
Vitamin K Antagonists (e.g., Warfarin) Increased plasma concentrations; requires monitoring of prothrombin time.
Phenytoin, Theophylline Increased plasma concentrations; risk of toxic level.

Substance and Disease-State Interaction Restrictions

Alcohol: Official labeling reports a Substance Intolerance Reaction upon co-ingestion, which may include symptoms such as facial flushing, malaise, and hypotension. The medicine is formally contraindicated in patients with severe hepatic impairment and in those with severe respiratory insufficiency. Additionally, a potential pharmacodynamic interaction exists with drugs that increase the QT interval, carrying an additive risk of QTc prolongation.

This structure reflects the mandated restrictions and clinically significant interactions defined in government drug prescribing information.

Mechanism of Action

How Nilutamide Works

Androgen Receptor Antagonism

Nilutamide's primary molecular action is acting as a competitive antagonist at the Androgen Receptor (AR), an intracellular protein found in the cytoplasm of target cells. It binds to the receptor's ligand-binding domain, preventing natural androgens from docking, activating the receptor, and triggering the gene expression cascade.


Inhibition of Hormone-Driven Gene Expression

This antagonistic binding interrupts the Androgen Signaling Pathway by preventing the AR from translocating to the cell nucleus and binding to DNA. This inhibition of gene transcription suppresses the production of proteins required for proliferation and maintenance in hormone-sensitive tissues.


Resulting Cellular Atrophy and Growth Suppression

Blocking the receptor and suppressing gene activity limits androgen-dependent cell proliferation. This molecular interference ultimately leads to cellular atrophy and a reduction in the metabolic activity of affected tissue structures, resulting in the drug's established physiological effects.

Dosage and Administration Information

Official Administration Guidelines for Nilutamide

Nilutamide is an antiandrogen prescribed as an oral tablet and must be used in combination with surgical castration for treatment. Following the procedure, Nilutamide treatment must begin on the same day as or the day after surgical castration to ensure maximum therapeutic benefit.

Dosing and Schedule

Phase Dose Frequency & Route
Initial 300 mg Once daily by mouth for the first 30 days
Maintenance 150 mg Once daily by mouth, continuing after the first 30 days

Nilutamide tablets should be swallowed whole and can be taken with or without food. The drug should be taken consistently, around the same time each day.

Procedural Instructions

  • Missed Dose: If a dose is missed, skip the missed dose and take the next dose at the regularly scheduled time. Do not take a double dose to compensate for the missed one.
  • Treatment Interruption: Do not interrupt dosing or stop taking this medication without consulting your physician. Sudden cessation can impact treatment efficacy.
  • Age and Gender: The established dosing is for adults (18 years and older). Safety and efficacy have not been established in the pediatric population. The medication is contraindicated for use in women.

The administration of Nilutamide is strictly a daily oral regimen, starting immediately after surgical castration, and following the clear procedural steps of an initial high-dose phase followed by a lower maintenance dose. The protocol requires consistent daily use without interpretation or adjustment outside of a healthcare provider's instruction. The combination of antiandrogen therapy with surgical castration is a key constraint in the official instructions.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Nilutamide


Evidence for Use in Advanced, Metastatic Prostate Cancer

The main research structure for Nilutamide involves large-scale, international Randomized Controlled Trials (RCTs). These studies examined the medicine as part of Combined Androgen Blockade (CAB), where it was investigated alongside castration treatment, versus castration alone. Research explored how symptoms change over time, monitoring outcomes related to the disease, including Overall Survival and the time interval until the disease showed signs of advancing (Time to Progression). These findings describe patterns observed in the studied populations.


Outcomes Evaluated and Populations Studied

Studies defined key outcomes by measuring Overall Survival and the time patients remained without evidence of cancer progression. They also monitored changes in the Prostate-Specific Antigen (PSA) biomarker, reporting the rate of PSA reduction. Research explored patient-reported outcomes describing perceived discomfort, such as bone pain or difficulty with urinary symptoms. The study populations included adult males with previously untreated metastatic prostate cancer. The medicine was examined only in the context of combined hormonal therapy and not as a standalone treatment.


Long-Term Data and Areas of Uncertainty

Some initial RCTs included long-term follow-up extensions, with some key studies monitoring outcomes for as long as 6 to 8 years. These studies describe extended patterns observed over time. However, long-term effects for all patients are not fully established. Researchers note that findings were mixed across some pooled analyses regarding conclusive survival patterns when adding a nonsteroidal antiandrogen to castration alone.

A key limitation is that the core research design was studied against castration alone. Comparative evidence is lacking for how the medicine was studied directly against newer, second-generation antiandrogen agents. Data for certain patient subgroups remain limited.

Frequently Asked Questions (FAQ)

Common questions about Nilutamide (FAQ)


Q: Do Nilutamide side effects usually go away after a while?

Many common side effects, such as altered adaptation to dark, may persist while a person is on the medication. These effects are typically reversible upon discontinuation, or may require a dose adjustment under a physician's supervision. Regulatory information notes that the risk of the serious lung condition, Interstitial Pneumonitis, is highest in the first three months of therapy.


Q: Is it normal to feel dizzy or lightheaded when starting Nilutamide?

Dizziness is a common adverse reaction reported in regulatory documents from clinical experience with Nilutamide. Lightheadedness or flushing may also occur as symptoms of a substance intolerance reaction if alcoholic beverages are consumed while taking the medicine.


Q: Can Nilutamide cause any vision problems?

The most common vision-related issue reported is altered adaptation to the dark, which is a temporary difficulty adjusting vision in low-light conditions. Wearing tinted glasses may help with this effect, and caution may be needed when driving at night or through tunnels. Less common vision changes, including decreased or blurred vision, have also been reported.


Q: Does Nilutamide cause weight gain or loss?

According to official product information, loss of appetite (anorexia) is reported as a common side effect in clinical trials. This loss of appetite can sometimes be associated with a decrease in body weight.


Q: Can Nilutamide affect a person's mood or cause depression?

Official regulatory information reports that depression and anxiety are among the Central Nervous System (CNS) reactions that have been seen in clinical data, though these are generally considered less common.


Q: Does Nilutamide affect physical stamina or energy levels?

Unusual tiredness or weakness (asthenia) is listed in regulatory information as a common adverse reaction reported in clinical data.


Q: Can Nilutamide cause changes in appetite?

Loss of appetite (anorexia) is listed in regulatory documentation as a common side effect of Nilutamide.


Q: Is it normal for my skin to become dry while on Nilutamide?

Dry skin is reported as a less common side effect in Nilutamide clinical data.


Q: How quickly should I expect Nilutamide to start working?

Nilutamide is eliminated slowly, with a mean half-life of around 56 hours. Therefore, it typically takes several days to reach stable drug levels in the body, which is required for the drug to fully exert its effect of blocking male hormones.


Q: How long does Nilutamide stay in your system?

The drug is eliminated slowly. Regulatory information reports the mean elimination half-life of Nilutamide is approximately 56 hours (about 2.3 days) in the body.


Q: Is Nilutamide safe for someone who has diabetes?

Nilutamide is used in combination with LHRH agonists (another type of hormonal therapy), a drug class associated with a reduction in glucose tolerance. Therefore, blood glucose monitoring is generally considered necessary for patients with diabetes when receiving this combined treatment.


Q: Does Nilutamide affect fertility in men?

The drug's hormonal mechanism leads to common adverse effects including testicular atrophy (shrinkage of the testicle). The full implications of this on male fertility should be discussed with a healthcare professional.


Q: Why is Nilutamide sometimes given before other prostate cancer treatments?

Nilutamide is indicated for use immediately following surgical castration. It is used as part of Combined Androgen Blockade (CAB) therapy to block the effects of male hormones that stimulate cancer growth following the surgical procedure.


Q: Is it true that Nilutamide can change the color of your urine?

Dark urine is listed in official documents as a potential symptom of severe liver injury (hepatotoxicity), which is a serious, rare side effect. If this symptom occurs, immediate medical evaluation is required.


Q: Are there generic versions of Nilutamide available?

Yes, regulatory records indicate that the FDA has approved generic versions of the active ingredient, nilutamide, at the 150 mg strength.


Q: Does Nilutamide treatment require any special precautions in the sun?

Some patients have reported experiencing increased sensitivity of the eyes to sunlight (photophobia). Using protective eyewear, such as tinted glasses, may be helpful for this effect.


Q: What's the typical duration of Nilutamide treatment for prostate cancer?

The official protocol involves an initial high dose phase followed by a lower maintenance dose. The overall duration of Nilutamide therapy is determined by the healthcare provider.


Q: Can Nilutamide affect my sleep?

Sleeplessness (insomnia) and trouble with sleeping are listed as adverse reactions that have been reported in clinical data for Nilutamide.


Q: Are there any dietary restrictions that make Nilutamide work better?

Official administration guidelines state that Nilutamide tablets can be taken with or without food. However, patients who experience a substance intolerance reaction are strongly advised to avoid alcoholic beverages.


Q: Is Nilutamide associated with any breathing problems?

Yes, Nilutamide carries an official Black Box Warning for Interstitial Pneumonitis, a serious lung condition. For this reason, it is contraindicated in patients with severe respiratory insufficiency.


Q: Can Nilutamide be used to treat other types of cancer?

Nilutamide is indicated only for the treatment of metastatic prostate cancer and is not approved for any other type of cancer or medical condition.


Q: Does Nilutamide affect physical stamina or energy levels?

Unusual tiredness or weakness (asthenia) is listed in regulatory information as a common adverse reaction reported in clinical data.


Q: What are the major concerns doctors have when prescribing Nilutamide?

The primary concerns highlighted in official warnings are the risks of Interstitial Pneumonitis (a severe lung condition) and severe Hepatotoxicity (liver injury). These risks necessitate close patient monitoring, including baseline chest X-rays and regular Liver Function Tests (LFTs).


Q: What age group most commonly receives Nilutamide treatment?

The medicine is indicated for use in adult males (18 years of age or older) with metastatic prostate cancer, which is typically a disease affecting older men.


Q: What are the long-term studies saying about Nilutamide safety?

Clinical trials included long-term follow-up extensions, with some studies monitoring outcomes for as long as 6 to 8 years, describing patterns of safety and efficacy observed over time in the populations studied.


Q: Does Nilutamide interact with blood pressure medication?

Nilutamide carries a potential interaction risk with drugs that increase the QT interval (a measure of heart rhythm). This may carry an additive risk of QTc prolongation, which is a heart rhythm disturbance.


Q: What is the success rate of Nilutamide when used as an initial therapy?

Clinical trials measured the effect of Nilutamide, when used in combination with surgical castration, by key outcomes such as Overall Survival, the Time to Progression of the cancer, and the rate of PSA reduction, compared to castration alone.

How should Nilutamide be stored and disposed of?

How to Store and Dispose of Nilutamide

Required Storage Conditions

Nilutamide tablets must be stored at Controlled Room Temperature, defined as 25 C (77 F), with permitted temperature excursions between 15 C and 30 C (59 F and 86 F). The medicine must be kept in its original container, which should be tightly closed.

Protect the tablets from freezing, excessive heat, light, and excessive moisture to maintain product stability.

Handling and Disposal

Nilutamide must be stored out of the reach of children.

Do not dispose of unused or expired tablets by flushing them down the toilet or throwing them in the household trash. Disposal should be done through an authorized medication take-back program or by following specific instructions provided by a healthcare professional to prevent environmental contamination.

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

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