Flumid

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Flumid

Treatment option: Carcinoma

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 Flumid

Property Description
Active ingredient Flutamide
Form Capsule (Oral Dosage Form)
Pharmacological class Nonsteroidal Antiandrogen (NSAA)
Origin Synthetic
Primary action Androgen Receptor Antagonist

Flumid is a prescription medicine that contains the synthetic active ingredient Flutamide, which is classified as a Nonsteroidal Antiandrogen (NSAA) and an Antineoplastic Agent. This single-ingredient product is engineered to deliver a systemic antiandrogenic effect, which is the primary mechanism used to manage cell growth processes driven by male hormones (androgens). The overall purpose of Flumid is to reduce the biological impact of androgens by interrupting their hormonal signaling pathways, a function clinically recognized for its role in suppressing hormone-sensitive growth.

What Type of Medicine is Flumid?

Flumid is defined by its core ingredient, Flutamide, which is a potent, synthetic chemical entity that functions as an androgen receptor antagonist. The product is manufactured as an oral dosage form, typically a capsule, which is the required vehicle for its intended oral route of administration to ensure its active components reach systemic circulation. Unlike some hormonal therapies, Flumid's nonsteroidal nature means its action is primarily limited to blocking the receptor sites. This targeted effect makes it a recognized option for managing conditions where androgen-dependent cell growth needs to be controlled.

Flutamide: Composition and Functional Principle

The drug’s therapeutic activity is initiated by Flutamide, which is considered a prodrug because it undergoes rapid conversion in the body into its major active metabolite, 2-hydroxyflutamide. The functional principle is competitive inhibition: the active metabolite works by actively and competitively blocking the androgen receptors on target cells, preventing circulating androgens—such as testosterone—from binding and exerting their growth-stimulating influence. This targeted action establishes the basis for its general therapeutic use as part of combination hormonal therapy.

What side effects are possible with Flumid?

Possible Side Effects and Safety Information

The official safety profile for Flumid (Flutamide) outlines potential adverse reactions categorized by frequency and the organ system affected, reflecting data documented in government regulatory sources such as the FDA and EMA. The effects frequently reported are often consequences of the medicine's primary action, while the profile also details rare but serious organ-specific risks.

Adverse Reaction Classifications

The most frequently observed adverse reactions are categorized as Very Common (occurring in 1 in 10 patients or more). These include gynecomastia (male breast enlargement), breast tenderness, diarrhoea, and hot flushes. Other effects, such as nausea, vomiting, and transient abnormal liver function, are classified as Common.

Adverse reactions are grouped by the body system affected, including the Reproductive System (gynecomastia, decreased libido), the Gastrointestinal System (diarrhoea, nausea), and the Hepatobiliary System (liver function changes).

Serious Safety Considerations

The regulatory profile highlights rare but serious adverse reactions that require vigilance. These include severe hepatic injury, which carries the risk of liver failure and has been reported to occur most frequently within the initial three months of treatment. Other serious reactions include interstitial pneumonitis (a severe lung inflammation) and, very rarely, malignant male breast neoplasms.

Safety constraints restrict the use of Flumid. The medication is contraindicated for use in women and the pediatric population. Additionally, patients with pre-existing severe hepatic impairment should not use this medicine. Caution is also advised for individuals with cardiovascular or impaired renal function, as documented in official labeling.

Overdose and Emergency Response

Overdose and When to Seek Help for Flumid (Flutamide)

The official regulatory profile for Flumid overdose details clinical manifestations and mandated emergency protocols. Documented signs associated with high-dose exposure include malaise, vomiting, decreased appetite, and transient breast tenderness. A major concern following acute massive ingestion is the severe, life-threatening risk of Methemoglobinemia, which presents with Cyanosis and can lead to acute tissue hypoxia.

Mandated Emergency Actions

Action Regulatory Statement
Seek Help Seek immediate medical attention for any suspected overdose. Contact a poison control center immediately upon recognition of acute exposure.
Antidote Status Official labeling states that no specific antidote is known for Flumid overdose.

Management and Monitoring

Overdose management is restricted to symptomatic and supportive treatment. Procedures documented by regulatory authorities include the potential use of gastric emptying and the administration of activated charcoal to limit systemic absorption. The specific complication of methemoglobinemia necessitates the intervention of Methylene blue. Due to the systemic risks, close hospital monitoring is required. This monitoring involves specific follow-up of vital signs, hepatic function (liver enzymes), and continuous observation of methemoglobin levels to manage potential life-threatening complications. This focus on immediate supportive care and monitoring is crucial given the lack of a known specific reversal agent.

Therapeutic Uses of Flumid

Flumid is commonly used to help with conditions and symptoms related to systemic imbalance driven by the action of male hormones (androgens), and is applied across domains where additional symptomatic support is needed. This antiandrogen is considered relevant for managing prostatic carcinoma and addressing hyperandrogenism.

This medication is commonly used for managing symptoms associated with advanced prostate cancer and is considered relevant for managing symptoms associated with androgen excess, such as hirsutism (unwanted hair growth), severe acne, and seborrhea. It is often used during phases when symptoms become more noticeable, for example, as an important component of combination hormonal therapy for cancer, and may assist with managing the temporary surge in testosterone (a flare) when other treatments are initiated. For patients dealing with chronic hormonal conditions, it contributes to improved comfort during periods of heightened symptoms and is applied in addressing visible physical manifestations.

“It is commonly used across conditions presenting with acute episodes and helps address symptom clusters that may become intense or disruptive.”

Quick Fact: Support for Androgen-Driven Symptoms

Flumid is applied in contexts involving symptoms related to systemic imbalance driven by male hormones, supporting patients with noticeable physiological strain and discomfort.

Regulatory References

  1. NIH StatPearls on Flutamide Indications

Eligibility and Restrictions for Use

The use of Flumid (Flutamide) is defined by strict regulatory population eligibility rules and contraindications found in official government labeling. The medicine is authorized only for Adult Male Patients, and its use in older male adults is established.

Absolute Contraindications

Flumid is strictly contraindicated and not indicated for use in:

  • Female Patients (including during pregnancy, due to potential fetal harm).
  • Patients with known Hypersensitivity to flutamide or any formulation component.
  • Patients with Severe Hepatic Impairment (including when baseline serum transaminase levels exceed two to three times the upper limit of normal).

Use Restrictions and Cautions

  • Pediatric Patients (<18 years): Use is not established and not authorized by regulatory bodies.
  • Impaired Organ Function: Use requires caution in patients with impaired renal function or existing pre-existing hepatic dysfunction.
  • Comorbidities: Caution is required in patients with known cardiac disease. The medicine is also contraindicated in patients with certain hereditary metabolic disorders (e.g., galactose intolerance) due to excipients.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

Flumid (Flutamide) enters into documented interaction patterns with several medicinal products and substances, as specified in official regulatory prescribing information.

Interactions Affecting Drug Exposure

Flumid's metabolism involves the CYP 1A2 and CYP 3A4 enzymes. Co-administration with enzyme inhibitors (e.g., Idelalisib, Cobicistat) is associated with an increase in the plasma concentration of Flumid’s active metabolite. Conversely, combining Flumid with enzyme inducers (e.g., Belzutifan, Dabrafenib) may decrease the effective exposure. This pharmacokinetic constraint is a primary consideration when these categories of medicines are used concurrently.

Pharmacodynamic and Coagulation Effects

Co-administration with Oral Anticoagulants such as Warfarin has been officially reported to cause an increase in prothrombin time, reflecting an alteration in the body's clotting parameters. Additionally, there are documented concerns that combining Flumid with certain Heart Rhythm Medicines may increase the risk of heart rhythm problems. The risk of methemoglobinemia is increased when Flumid is used alongside other agents known to induce this condition.

Other Interaction-Related Constraints

The regulatory label notes that the consumption of alcohol may exacerbate the occurrence of flushing during treatment. Furthermore, specific populations, including smokers and individuals with conditions such as G6PD deficiency or Hemoglobin M disease, are noted to have a heightened susceptibility to toxicities associated with the Flumid metabolite. No mandatory timing separation rules for administration are documented in official prescribing information.

Mechanism of Action

Targeting Receptor and Channel Activity

Flumid's primary mechanistic focus is on influencing Gated Receptor Systems and specific Calcium Channels. The drug directly interacts with key molecular targets within cellular membranes, particularly those governing the flux of ions critical for electrical stability. This action serves to modulate signaling pathways and is relevant in systems where targeted pathway adjustment influences cellular excitability.

Modulation of Excitation Cascades

Beyond its initial binding, Flumid engages mechanisms within specific signaling cascades that regulate cellular excitation. By initiating a suppressive sequence at the molecular level, the drug helps to alter pathway activity that may escalate under certain conditions. This action influences signaling sequences that are associated with overactive physiological responses and promotes adjusted activity within targeted central and peripheral pathways.

Influence on Central Regulatory Balance

The drug acts within domains involving neurotransmitter- or mediator-mediated responses, influencing the equilibrium between excitatory and inhibitory signals. This engagement of feedback mechanisms influences systems associated with excessive mediator activity, thereby producing an alteration in physiological patterns.

Dosage and Administration Information

Official Administration Guidelines

Flumid is an oral medicine typically available as a 125 mg capsule or a 250 mg tablet dosage form. The administration schedule mandates a total daily dose of 750 mg, which is achieved by taking a 250 mg dose three times per day at approximately 8-hour intervals.


Procedural Requirements

Administration is an integral component of a combination regimen and must be initiated concomitantly with a LHRH agonist or following surgical castration. Official instructions recommend Flumid be started at least 24 hours prior to the LHRH agonist. The medicine is generally swallowed whole and may be taken with or without food, and is sometimes suggested to take it preferably after meals.


Course Duration and Special Use

The duration of use is specific to the clinical context. For locally confined disease, administration begins 8 weeks prior to initiating radiation therapy and continues throughout the course of radiation. For metastatic disease, Flumid should be continued until disease progression is observed. In the event of a missed dose, the instruction is to skip the missed dose and continue with the regular schedule, without doubling the amount. No dosage adjustment is explicitly required for older adults or patients with renal impairment.

This regimen establishes the standardized approach to administering Flumid.

Recent Clinical Evidence

Research evidence / Overview of studies for Flumid

This section provides an overview of the research and scientific evidence that has been conducted for Flumid (Flutamide), describing the types of studies performed, the patient groups examined, and the outcomes that researchers monitored. It is important to remember that these findings describe group patterns and do not determine whether an individual will respond similarly.


Research Evidence for Advanced Prostate Cancer

Research exploring the use of Flumid in advanced prostate cancer involved multiple large-scale Randomized Controlled Trials (RCTs) and comprehensive Meta-analyses. These studies enrolled adult men, often older adults, with advanced forms of the disease. The primary research approach involved studying Flumid as part of combination hormonal therapy, where it was used alongside treatments that are intended to lower the overall level of male hormones.

In these trials, researchers primarily monitored time-based measures of disease progression, such as Overall Survival and Progression-Free Survival. They also closely examined Prostate Specific Antigen (PSA) levels. Studies report that findings regarding the contribution of Flumid to long-term survival in this context were varied across early trials and regulatory summaries. The evidence base for this specific combination approach was established in earlier trials.


Research Evidence for Hyperandrogenism and Hirsutism

Research exploring the use of Flumid for hyperandrogenism, such as hirsutism (excessive hair growth) in women, has been conducted primarily using smaller-scale Randomized Controlled Trials (RCTs) and Observational Studies. These studies were conducted on adult women who experienced androgen-driven symptoms, including those diagnosed with Polycystic Ovary Syndrome (PCOS).

Researchers typically monitored changes in hirsutism severity using clinical scoring systems, as well as outcomes related to systemic or functional imbalance like the severity of acne and seborrhea. The certainty remains low, and evidence quality varies across studies due to differences in design and dosages used. The sample sizes were modest in many of these trials, and there is limited information for long-term outcomes describing the durability of changes.


What Remains Uncertain About the Research

A key uncertainty is the overall long-term contribution of Flumid to survival outcomes in prostate cancer compared to contemporary hormonal therapies, as comparative evidence is lacking for newer treatment standards. Across all indications, long-term effects are not fully established, and there is limited information for long-term outcomes, particularly regarding symptom maintenance after treatment concludes.

Frequently Asked Questions (FAQ)

Common questions about Flumid (FAQ)

Q: What is the general success rate of Flumid in clinical studies?

Studies examined Flumid when it was used as part of a combination hormonal therapy regimen. Researchers monitored time-based measures like Overall Survival, Progression-Free Survival, and PSA levels. Official documents report that the findings regarding the drug's specific contribution to long-term survival in early trials were varied.

Q: Are there any known long-term side effects associated with Flumid use?

Severe hepatic injury (liver damage) has been reported, with the highest frequency occurring within the initial three months of treatment. Official information indicates that the long-term use of the broader category of treatment, known as androgen deprivation therapy, has been associated with risks such as bone loss and changes in cardiovascular risk factors.

Q: Are there signs that indicate a possible allergic reaction to Flumid?

Signs of a serious allergic reaction reported in official patient information include the development of hives, difficulty breathing, or swelling of the face, lips, tongue, or throat.

Q: Are there any known food or beverage interactions with Flumid?

According to official instructions, the medicine may be taken with or without food. Consumption of alcohol is noted to potentially worsen the occurrence of flushing (a warming and redness of the skin). There are no other common beverage interactions explicitly listed as a contraindication in the regulatory label.

Q: What information is available on using Flumid while breastfeeding?

Flumid is strictly not indicated for use in women and should not be used during breastfeeding. This is because the medicine has been observed to suppress lactation (milk production) in animal studies, and its secretion into human breast milk is not established.

Q: Do patients need a special blood test before starting Flumid?

Regulatory documents state that Liver Function Tests (LFTs) are recommended at baseline (before treatment begins) and monitored regularly, including monthly for the first four months, due to the reported risk of hepatic injury.

Q: Does Flumid commonly cause drowsiness or affect ability to drive?

Reported side effects include drowsiness and confusion, occurring in less common reports. The official product labeling contains a caution that driving or operating machinery should be avoided if tiredness, dizziness, or confusion is experienced.

Q: Does stopping Flumid abruptly cause any known withdrawal effects according to official documents?

The occurrence of an Antiandrogen Withdrawal Syndrome has been reported in patients following the discontinuation of the medicine.

Q: What steps are described for managing mild side effects of Flumid?

Official information notes that for a specific side effect like diarrhea, avoiding products such as dairy may offer some help. Management of other mild side effects involves consultation with a healthcare professional.

Q: Can Flumid be taken with common pain relievers like ibuprofen or acetaminophen?

The official labeling indicates that patients should disclose all current medicines to their healthcare provider. This includes over-the-counter pain relievers, vitamins, and herbal products, as these other drugs may potentially interact with Flumid.

Q: Does Flumid interact with any commonly used herbal supplements or vitamins?

The official labeling notes that other drugs, including herbal products and vitamins, may interact with Flumid. Patients are generally expected to inform their healthcare provider about all supplements they are using.

Q: Does Flumid interact with any common anti-depressant medications?

Flumid is known to interact with medicines that affect specific liver enzymes called CYP 1A2 and CYP 3A4. Since some common anti-depressant medications influence these same enzymes, concurrent use requires assessment by a healthcare professional to adjust for the potential interaction.

Q: How quickly does Flumid generally start working?

Official documents describe the pharmacokinetics of the drug, noting that it reaches a steady state plasma concentration after the fourth dose when taken three times daily. However, the exact onset of the clinical effect will vary depending on the condition being treated and the individual patient.

Q: How long does the effect of a single dose of Flumid typically last?

Official pharmacokinetic data describes the drug's duration of action. The major active metabolite of Flumid has a reported half-life of approximately 10 hours.

Q: Is it true that Flumid must be taken for a few weeks before noticing full effects?

Official documents describe the pharmacokinetics of the drug, noting that it reaches a steady state plasma concentration after the fourth dose when taken three times daily. The onset of the full clinical effect can vary and depends on the condition being treated and the individual patient.

Q: Are there any known genetic factors that are known to affect how Flumid works?

Official information notes that patients with conditions such as Glucose-6-phosphate dehydrogenase (G6PD) deficiency or Hemoglobin M disease are noted to have a heightened susceptibility to toxicities. This suggests that certain genetic factors can influence the body's reaction to the Flumid metabolite.

Q: Is there a generic equivalent available for Flumid?

Flutamide is the generic name of the active ingredient found in the brand name Flumid. Regulatory information confirms that this medicine is available as a generic product in addition to the brand name form.

Q: Is Flumid considered a first-line treatment option according to official guidelines?

Flumid is classified as a first-generation androgen receptor blocker and is officially approved for use in combination hormonal therapy. Official guidelines mention that newer therapies are often used to delay the spread of cancer and extend life, which provides context for its current use.

Q: Why do people sometimes stop taking Flumid early?

Clinical trial data reports that common reasons for treatment discontinuation include the occurrence of severe side effects. Examples of these serious adverse reactions include severe diarrhea or liver-related adverse reactions.

Q: Can Flumid cause changes in body weight (gain or loss)?

Reported side effects include increased appetite and the retention of fluid leading to edema (swelling). Additionally, official documents indicate that androgen deprivation therapies, of which Flumid is a part, have been generally associated with an increase in body weight.

Q: What information is available about Flumid's impact on sleep patterns?

The official safety profile includes reported side effects related to sleep. These include both difficulty sleeping (insomnia) and an increased level of sleepiness (somnolence).

How should Flumid be stored and disposed of?

How to Store and Dispose of Flutamide (Flumid)

Official regulatory labeling dictates specific conditions for storing Flutamide capsules to ensure stability and safety.


Storage Conditions

Flutamide must be stored at Controlled Room Temperature, which is 20 C to 25 C (68 F to 77 F). The product must be protected from moisture, excessive heat, and light and should be kept in a tightly closed container. It is mandatory to keep this medicine out of the reach of children.

Disposal Requirements

Due to its classification as an antineoplastic agent, Flutamide is considered a hazardous medicinal product. Unused or expired capsules should be disposed of properly through a drug take-back program. It is explicitly advised not to flush Flutamide down the toilet or sink, in compliance with environmental and cytotoxic waste handling guidelines.

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

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