Flavuril

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Medically reviewed

Rosario Oropesa

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 Flavuril

Property Description
Active ingredient Fluticasone furoate and Vilanterol trifenatate
Form Inhalation powder (DPI)
Pharmacological class ICS/LABA Combination
Common purpose Daily maintenance of respiratory function
Origin Synthetic

What Type of Medicine is Flavuril?

Flavuril is a combination pharmaceutical product belonging to the pharmacological class of long-acting beta2-agonist (LABA) and inhaled corticosteroid (ICS) medicines. It is a synthetic, prescription-only therapy for the daily management of chronic breathing conditions. The product is a combination of two distinct pharmacological agents, which is a key distinguishing factor from single-ingredient inhalers. Flavuril is designed for once-daily use, characterized by its sustained lung retention time.


What Are the Ingredients and Physical Form?

Flavuril contains two active ingredients: Fluticasone furoate, an ICS, and Vilanterol trifenatate, a 24-hour LABA. Fluticasone furoate is specifically a glucocorticoid known for its high topical anti-inflammatory activity. The medicine is delivered as an inhalation powder, which is the dosage form utilized in a dry powder inhaler (DPI) device. The oral inhalation route ensures the medication reaches the deep airways directly and efficiently, maximizing its local therapeutic effect.


What is the Overall Purpose of This Combination?

The overall purpose of Flavuril is to provide sustained, daily control by simultaneously fighting inflammation and keeping the airways relaxed, thereby preventing symptoms. This dual action helps to prevent symptoms and improve overall breathing capacity. This combination is used for managing symptom exacerbations compared to ICS monotherapy. The ICS component addresses the underlying swelling and irritation, while the LABA component provides consistent bronchodilation to improve breathing capacity as part of a daily maintenance plan.

What side effects are possible with Flavuril?

Possible Side Effects and Safety Information

Flavuril's safety profile is defined by both common local effects and the potential for systemic corticosteroid-related adverse reactions, particularly with high-dose or long-term administration. The medicine is not indicated for the rapid relief of acute asthma attacks or status asthmaticus.

Common and Local Adverse Reactions

The most commonly documented adverse reactions, observed with an incidence greater than 3% in clinical trials, include upper respiratory tract infection or inflammation, throat irritation, sinusitis, dysphonia (hoarseness), candidiasis of the mouth and pharynx, cough, bronchitis, and headache.

System-Organ Class Examples of Common Adverse Reactions
Infections and Infestations Oropharyngeal Candidiasis, Upper Respiratory Tract Infection, Sinusitis, Bronchitis
Respiratory Disorders Throat Irritation, Dysphonia, Cough
Nervous System Disorders Headache

Serious and Clinically Significant Safety Concerns

Regulatory documents highlight several serious or clinically significant risks associated with the use of inhaled corticosteroids like Flavuril:

  • Systemic Corticosteroid Effects: The potential for hypercorticism and adrenal suppression exists, particularly in susceptible individuals or with high dosages. This risk requires careful monitoring and a slow taper if the drug must be discontinued.
  • Infection Risk: Flavuril may lead to localized infections, such as oropharyngeal candidiasis. It can also cause the worsening of existing infections (e.g., fungal, viral, or bacterial) due to immune suppression. Susceptible patients may have a more serious course of diseases like chickenpox or measles.
  • Hypersensitivity: Immediate hypersensitivity reactions, including anaphylaxis, are possible and necessitate immediate drug discontinuation.
  • Ophthalmologic and Bone Effects: Long-term use of inhaled corticosteroids is associated with the potential for glaucoma, cataracts, and a reduction in bone mineral density.

Population-Specific Notes

Pediatric patients require growth monitoring during prolonged treatment, as inhaled corticosteroids may affect growth velocity. Patients transitioning from long-term systemic corticosteroids must be closely supervised for signs of adrenal insufficiency.

Overdose and Emergency Response

The official regulatory profile for Flavuril (Flavoxate Hydrochloride) documents specific manifestations that may occur in an overdose situation, primarily involving the central nervous system (CNS) and anticholinergic effects. Documented presentations include severe drowsiness, severe dizziness, unusual excitement, restlessness, irritability, and clumsiness or unsteadiness. Ophthalmic signs such as blurred vision and systemic effects like fever and redness of the face are also officially listed as presentations.

When Immediate Medical Help Is Required

Regulatory guidance explicitly identifies life-threatening indicators that require immediate emergency action. Urgent medical services must be contacted if the individual has collapsed, experienced a seizure, has troubled breathing, or cannot be awakened. The official procedure directs contacting the poison control helpline for immediate guidance, or a doctor or hospital if an accidental overdose is suspected.

Supportive Care and Official Constraints

Treatment for overdose is mandated as symptomatic and supportive, as no specific antidote is known. The official prescribing information also notes that the substance's dialyzability status is unknown. A population-specific note highlights that mental confusion is a CNS manifestation especially likely to affect the elderly during high exposure scenarios.

Therapeutic Uses of Flavuril

What Flavuril Treats: Main Uses and Benefits

Flavuril, which contains flavoxate hydrochloride, is primarily used in the management of uncomfortable urinary symptoms that may be associated with irritation or inflammation of the urinary tract. The medicine is commonly utilized in clinical scenarios involving conditions such as cystitis (bladder inflammation), prostatitis, and urethritis. It is compatible with other prescribed treatments used for definitive management of underlying conditions.

This medication is used to help manage various uncomfortable symptoms. It is used to help alleviate the discomfort associated with dysuria (painful urination), urgency, nocturia (frequent nighttime urination), suprapubic pain, and frequency. This symptomatic relief may contribute to greater patient comfort during periods of urinary irritation. Flavoxate is utilized to relieve symptoms associated with an irritated or overactive bladder.


Quick Fact: Management of Urinary Discomfort

Regulatory References

  1. NIH MedlinePlus overview on Flavoxate

Eligibility and Restrictions for Use

Who Can and Cannot Use Flavuril?

This section defines the population eligibility for Flavuril (flavoxate hydrochloride) as stated in official government regulatory documents.


Populations for Whom Use is Contraindicated

Flavuril is absolutely contraindicated and must not be used in patients with pre-existing obstructive conditions of the lower urinary or gastrointestinal tracts. This includes individuals with obstructive uropathies, pyloric or duodenal obstruction, achalasia, obstructive intestinal lesions, ileus, or active gastrointestinal hemorrhage. Use is also contraindicated in patients with Myasthenia gravis or a known hypersensitivity to the medicine.


Age-Related and Conditional Eligibility

Population Regulatory Status
Children under 12 Not recommended; safety and effectiveness are not established.
Older Adults Use requires caution due to increased risk of mental confusion.
Pregnant Women Use is restricted to if clearly needed (FDA Category B).
Nursing Mothers Not recommended; it is unknown if the drug is excreted in human milk.

Caution is required when prescribing Flavuril to patients with renal impairment (kidney disease) because the medicine's clearance may be affected. Similarly, the drug should be given cautiously to patients with suspected glaucoma.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Flavuril (flavoxate hydrochloride) documents specific interaction patterns that may alter drug exposure or result in additive pharmacodynamic effects.

Pharmacodynamic Interactions Co-administration with other Anticholinergic Agents may result in an additive pharmacodynamic effect, potentially increasing the systemic response to anticholinergic activity.

A clinically significant interaction exists when combining Flavuril with Opioid Analgesics. This combination increases the risk of severe constipation or urinary retention due to the combined reduction of gastrointestinal motility. Similarly, co-administration may enhance the action of neurotoxins, such as Botulinum Toxin, leading to exaggerated systemic anticholinergic effects.

Exposure-Modifying Interactions and Timing Rules The concurrent oral administration of Antacids may interfere with the absorption of Flavuril, potentially reducing the overall exposure of the medicine. To mitigate this effect, a mandatory timing rule states that the administration of Flavuril and antacids must be separated by at least 2 hours.

Substance and Product Interactions The consumption of Alcohol while taking Flavuril may lead to an increase in central nervous system side effects, specifically reports of intensified drowsiness and dizziness. There are no known regulatory warnings documented for interactions with food or common herbal products. The regulatory labeling does not list any specific drug-drug combinations that are formally classified as contraindicated.


Regulatory Summary: The documented interaction structure of Flavuril primarily involves pharmacodynamic synergy and specific timing constraints established to manage absorption interference.

Mechanism of Action

Blocking Neurotransmitter Signals

Flavuril functions as an antagonist by binding to and blocking the muscarinic cholinergic receptors (M1, M2, and M3 subtypes) located on the smooth muscle and glands of the airways. This action prevents the endogenous neurotransmitter acetylcholine from binding to its target sites. This disruption effectively interferes with the nerve signals propagated by the parasympathetic system.

Modulating Airway Muscle Tone

The inhibition of this cholinergic signaling cascade prevents the intracellular processes that cause airway muscle fibers to contract. This mechanism results in the relaxation of the airway smooth muscle, which is the core physiological consequence that leads to the widening of the air passages and a resulting decrease in airflow resistance.

Controlling Glandular Activity

By blocking the receptors on submucosal glands, the drug also modulates the secretory pathway driven by the parasympathetic nervous system. This reduces the rate of fluid and mucus production, thereby decreasing the overall volume of secretions within the airways.

Dosage and Administration Information

How Flavuril is Used

Flavuril, which contains flavoxate hydrochloride, is intended for oral administration in the form of a tablet. The general parameters for use include dose, frequency, and specific administration conditions.


Official Administration Guidelines

Parameter General Administration Parameters
Route of Administration Oral
Dosage Range The standard adult dose is 100 mg to 200 mg per dose.
Dosing Frequency The medicine is typically taken 3 or 4 times a day (TID or QID).
Intake Timing Tablets should be taken after a meal.
Age Restriction Use is not recommended for children under 12 years of age, as safety and efficacy have not been established.

Procedural Usage Rules

The established protocol for using Flavuril specifies the sequence and conditions for its intake. The dose may be reduced once an improvement in symptoms is observed, allowing for an adjustment in the regimen. If a scheduled dose is missed, standard practice involves skipping the missed dose and resuming the regular schedule, avoiding taking a double dose to compensate. These procedural rules provide the standardized framework for the administration of this medicine.

Recent Clinical Evidence

Research evidence / Overview of studies for Flavuril

1. Research Overview for Management of Uncomfortable Urinary Symptoms

The research explored symptomatic changes in the context of uncomfortable urinary symptoms associated with irritation or inflammation of the urinary tract. The evidence base includes clinical trials conducted to evaluate its characteristics and properties, alongside summaries of clinical experience documented by regulatory and scientific bodies. Research examined patterns in patients presenting with conditions involving periods of heightened symptoms, such as those seen in cystitis, prostatitis, and urethritis.

2. Outcomes Measured in Clinical Evaluations

The core research explored specific patient-reported outcomes describing perceived discomfort related to the urinary tract. Research monitored outcomes including measuring the intensity of dysuria (painful urination) and quantifying changes in the number of urgency episodes experienced by patients. Furthermore, studies monitored metrics related to functional imbalance, such as the frequency of urination, both during the day and at night (nocturia). The clinical trials focused on outcomes describing episodic or acute changes in symptoms.

3. Evidence Strength and Consistency

The research base supporting Flavuril is broadly considered to have a Moderate level of evidence strength. This assessment reflects the evidence base used for regulatory review and scientific evaluation. The evidence is derived from clinical trials and summaries of clinical experience.

4. Studies Regarding Long-Term Use and Follow-up

Research explored short-term symptom changes, but data on the durability of these patterns over extended periods are not fully established in the publicly available authoritative summaries. Follow-up durations were limited in many of the core trials. Findings describe group patterns, not personal outcomes regarding sustained outcomes over many years.

5. What Remains Uncertain or Requires Further Research

Evidence highlights what is known — and what is still uncertain regarding the research base for Flavuril. There is limited information for long-term outcomes and a lack of highly detailed data on the experience of specific subgroups within the authoritative research record. Evidence quality varies across studies and specific subgroup findings are uncertain due to trials focusing on broad patient samples.

Key Studies & References Flavoxate (Flavoxate Hydrochloride) Drug Information

Frequently Asked Questions (FAQ)

Common questions about Flavuril (FAQ)


Q: Is it true that official sources list drowsiness as a possible side effect of Flavuril?

A: According to the official product information, drowsiness is listed as a possible adverse reaction. Regulatory sources suggest that this feeling of sleepiness may become more pronounced when the medicine is used at the same time as alcohol.


Q: How often do people report feeling dizzy while taking Flavuril?

A: Official regulatory documentation includes dizziness as a reported adverse reaction. While the exact frequency is detailed in the full prescribing data, it is typically listed as a non-common or infrequent event based on clinical trial observations.


Q: Can a patient drink coffee while taking Flavuril?

A: Official regulatory warnings do not document any known adverse interactions between Flavuril and common food or typical herbal products. Questions about your diet, including caffeine, are best discussed with a healthcare professional.


Q: Is Flavuril a medication that typically needs to be taken indefinitely?

A: According to official administration guidelines, the dosage may be reduced once an improvement in a patient's symptoms is observed. This procedural rule suggests that the use of Flavuril is not necessarily indefinite for all patients.


Q: Where can I find the official clinical trials data for Flavuril?

A: The evidence base for Flavuril is derived from clinical trials summarized by regulatory and scientific bodies. Official sources like the NIH MedlinePlus provide detailed overviews and summaries of the research and findings used for the medicine's evaluation.


Q: Were there any studies comparing Flavuril to placebo?

A: The clinical trials summarized in regulatory documents often include comparisons to a placebo, which is an inactive substance, or to an active comparator medicine. These comparisons are used to help evaluate the characteristics of Flavuril.


Q: What is meant by the 'risk profile' of Flavuril?

A: The official 'risk profile' for Flavuril summarizes the drug's safety characteristics. This profile is defined by all documented side effects, major safety warnings, and the full list of contraindications (reasons not to use the drug) found in the regulatory labeling.


Q: Does taking Flavuril require routine monitoring like regular blood tests?

A: Official regulatory labeling specifies certain monitoring requirements, particularly growth monitoring for pediatric patients and close supervision for individuals transitioning from other steroid treatments. However, routine monitoring via general blood tests is not explicitly mandated for all adult users in the official documentation.


Q: What information is given on the FDA's DailyMed page for Flavuril?

A: The FDA's DailyMed page provides the complete, authoritative regulatory text for Flavuril. This includes detailed information about the medicine's purpose, specific administration rules, important warnings, and a full list of documented side effects.


Q: Does Flavuril affect the ability to drive or operate machinery?

A: Official prescribing information advises that due to the potential for adverse effects such as dizziness and drowsiness, caution may be necessary. Official information suggests assessing how the medicine affects an individual before driving or operating heavy machinery.


Q: Does Flavuril cause changes in appetite?

A: Official regulatory documents list adverse reactions reported in clinical studies. Changes in appetite are not listed among the most commonly documented adverse reactions in the official labeling.


Q: Is experiencing mild nausea common when beginning to use Flavuril?

A: Official regulatory information outlines the frequently documented adverse reactions observed during clinical trials. Nausea is not listed among these most frequently reported reactions in the product information.


Q: Is hair loss listed as a possible side effect of Flavuril in regulatory documents?

A: Hair loss is not listed among the most commonly documented adverse reactions in the official regulatory labeling for Flavuril.


Q: Does Flavuril interact with common over-the-counter pain relievers like ibuprofen?

A: The regulatory documentation lists specific, known drug interactions that can alter the effects of Flavuril. Common non-prescription pain relievers like ibuprofen are not cited in the official list of known interactions documented in the prescribing information.


Q: Does taking Flavuril affect the effectiveness of birth control pills?

A: Regulatory information does not document any known drug-drug interaction that specifically impacts the effectiveness of oral birth control pills.


Q: How long does it usually take to notice any effect from Flavuril, according to clinical trials?

A: Research supporting Flavuril examined short-term symptom changes in patient groups. However, regulatory summaries may not specify a precise onset time (e.g., within hours or days) for when an individual can expect to notice an effect.


Q: How quickly does Flavuril leave the body after a patient stops using it? (General description)

A: The official labeling contains information on pharmacokinetics, which describes how the body handles the medicine. This information details the rate at which the drug is absorbed, metabolized, and cleared from the body.


Q: Is it normal to feel no difference after only a few days of taking Flavuril?

A: Research evidence focuses on patterns observed in patient groups and changes over the course of treatment. Regulatory summaries focus on these group outcomes and may not provide specific guidance regarding individual response within the first few days of use.


Q: How does Flavuril affect someone with a pre-existing heart condition?

A: The official labeling includes special warnings and precautions for use in patients with certain pre-existing conditions. This information indicates that caution or monitoring may be warranted in these specific situations, including those involving heart conditions.


Q: Why is Flavuril only available by prescription?

A: Flavuril is officially classified as a prescription-only therapy by regulatory bodies. This status is mandated because the medicine requires supervision from a healthcare professional to ensure its safe and appropriate use.


Q: What does the term 'contraindication' mean for Flavuril? (Clarification of concept)

A: A contraindication is a concept defined in medical regulation that lists conditions or factors that make a specific medical treatment inappropriate. For Flavuril, contraindications are conditions where the risks of using the medicine are considered to clearly outweigh any potential benefits.


Q: Can Flavuril cause dependency or addiction?

A: Official regulatory labeling includes specific sections to address the potential for drug abuse or dependence for all medicines. This potential is not documented for Flavuril in the official prescribing information.


Q: Why do some online sources say Flavuril is for a different purpose than what my doctor said?

A: Regulatory documents clearly define the sole approved purpose (known as the indication) for which Flavuril can be legally marketed. Any discussion of the medicine for other conditions is considered off-label and is not supported by the official labeling or regulatory approval.


Q: Is Flavuril known to cause weight gain?

A: Weight gain is not listed among the most commonly documented adverse reactions in the official labeling for Flavuril.


Q: Does Flavuril interact with common flu shots or other standard vaccines?

A: Regulatory information documents specific drug interactions that may alter the effects of the medicine. However, no known interaction with common vaccines, such as a flu shot, is documented in the official prescribing information.


Q: Is Flavuril described as being safe to crush, chew, or split in the patient instructions?

A: The official Patient Information Leaflet provides specific administration instructions on how the tablets should be taken. This document clarifies whether the medicine can be altered (crushed, chewed, or split) or if it must be swallowed whole as directed for use.


Q: What are the known differences in effect or side effect profile between the pill and liquid form of Flavuril?

A: The official labeling, found in the prescribing information, specifies the available dosage forms (e.g., tablet, liquid, inhalation powder) and their individual characteristics. This documentation outlines how each form is administered and notes known differences in their profile.


Q: Is it normal for Flavuril to change the color of a patient's urine or sweat?

A: Regulatory documents list all adverse reactions observed and reported during clinical development. Changes in the color of a patient's urine or sweat are not listed as an official or documented adverse reaction in the prescribing information.


Q: What is the definition of a 'serious' side effect for Flavuril according to regulatory bodies?

A: Regulatory agencies define a serious adverse event (SAE) based on its outcome rather than frequency. An event is classified as serious if it results in death, is life-threatening, requires hospitalization, or leads to persistent or significant disability.

How should Flavuril be stored and disposed of?

How to Store and Dispose of Flavuril?

Official regulatory documents define specific requirements for the storage and disposal of this medicine to ensure its stability and safety.

Storage Requirements

Classification Requirement
Temperature Store below 30 C. Do not freeze or refrigerate.
Protection Keep the product in the original container, protected from light and moisture.
Safety Always keep Flavuril out of the sight and reach of children.

Disposal Instructions

To prevent environmental contamination and misuse, unused or expired Flavuril must not be discarded in household trash or poured into wastewater. Dispose of the medicine through an approved take-back program or a regulated pharmaceutical waste collection point, in accordance with local guidelines.

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

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