Flix

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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 Flix

What is Flix?

Flix is a brand name for an inhaled medication containing the active ingredient fluticasone. Fluticasone belongs to a class of drugs called corticosteroids (often referred to as steroids).


Mechanism of Action and Use

Flix is primarily prescribed to help prevent the symptoms of asthma in both adults and children. It is a long-term controller medicine and is not used to treat a sudden, acute asthma attack.

As an inhaled corticosteroid, fluticasone works directly in the airways. Its main mechanism of action is to decrease swelling and inflammation (irritation) within the airways, which ultimately allows for easier breathing and reduces the frequency and severity of asthma attacks. For maximum benefit, Flix must be used every day in regularly spaced doses, even when symptoms are not present.

What side effects are possible with Flix?

Possible Side Effects and Safety Information

The safety profile for Flix, based on regulatory documentation, involves a spectrum of potential adverse reactions, ranging from common, generally mild events to rare, serious considerations that require specialized monitoring.

Common Adverse Reactions

The most frequently reported adverse reactions (Very Common, occurring in more than 1 in 10 patients) include headache, fatigue, and infections of the upper respiratory tract, such as colds or sinusitis. Other commonly reported events (Common, occurring in up to 1 in 10 patients) involve gastrointestinal issues like nausea and abdominal pain, as well as various types of infusion-related reactions that are managed through careful administration and monitoring.

Classification Example Adverse Reactions
Very Common Headache, Fatigue, Viral infections, Upper respiratory tract infection
Common Nausea, Abdominal pain, Infusion-related reactions, Pain

Serious and Clinically Significant Risks

While uncommon, Flix is associated with a risk of serious and potentially life-threatening reactions. These include severe hypersensitivity reactions and anaphylaxis, which are rare and require immediate clinical management. There is also a documented risk of serious infections, including tuberculosis and sepsis, requiring patients to be screened and monitored closely for signs of infection before and during treatment.

Safety data also indicates the potential for blood and lymphatic system disorders such as neutropenia, and severe cardiac failure in patients with pre-existing moderate or severe heart disease. Due to the biological nature of the treatment, the risk of developing certain malignancies is also included in the official safety summary.

Safety Monitoring and Restrictions

Flix is contraindicated in patients with a known allergy to the active substance, mouse proteins, or any excipients. It is also restricted for use in patients with severe infections or moderate to severe heart failure. Prescribers must ensure patients are appropriately monitored for infusion reactions during and for a period after administration. Special consideration is required for use in children, where the risk of certain infections may be elevated, and for all patients regarding the up-to-date status of vaccinations before starting therapy.

Overdose and Emergency Response

Overdose and When to Seek Help

An overdose of Flix (an opioid-containing product) is a medical emergency that can be fatal and requires immediate action. The primary danger of an opioid overdose is severe central nervous system and respiratory depression, which can lead to death from lack of oxygen.

Signs and Symptoms of Overdose

Recognizing the following signs is critical, as they suggest opioid poisoning:

  • Respiratory Distress: Slowed, shallow, or difficult breathing; or breathing that stops entirely.
  • Mental Status Change: Severe sleepiness, stupor, inability to wake up, or coma.
  • Pupils: Pinpoint pupils (very small).
  • Physical Signs: Cold, clammy skin; a limp body; and blue or purple coloring of the lips or fingernails (cyanosis).

Emergency Actions Required

If an overdose is suspected, call emergency services (e.g., 911) immediately. Time is critical, as respiratory failure can occur quickly. If available, an opioid antagonist medication, such as naloxone, should be administered right away to temporarily reverse the effects of the opioid. Supportive measures for vital functions, including rescue breathing or CPR, may be necessary until medical help arrives. Even if a person revives after naloxone administration, urgent medical assessment is still required, as the overdose symptoms may return due to the drug's extended action.

Therapeutic Uses of Flix

Flix (infliximab) is applied across domains where additional symptomatic support is needed for a number of chronic inflammatory and autoimmune conditions characterized by periods of heightened symptoms. This medicine is relevant in contexts involving heightened systemic burden.


This medicine is commonly used to help with symptoms related to inflammatory or irritative states. It is used in situations involving the following conditions: rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, Crohn’s disease, ulcerative colitis, and moderate to severe plaque psoriasis. For patients with these severe conditions associated with acute or disruptive episodes, this treatment supports general well-being during symptomatic phases and contributes to easing the overall symptom load.

“This treatment helps maintain a sense of stability when symptoms are more noticeable.”


Quick Fact: Supports Management of Symptoms that Interfere with Daily Functioning

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Flix (Infliximab) — Official Regulatory Information

The official population eligibility for Flix (infliximab) is strictly defined by regulatory authorities based on contraindications, age limits, and specific conditions.

Category Official Regulatory Statement
Populations for whom use is allowed Approved for adult patients (mathbfge 18 years) for all indications. Approved for pediatric patients (mathbfge 6 years) with moderately to severely active Crohn’s Disease or Ulcerative Colitis.
Populations for whom use is contraindicated Patients with a prior severe hypersensitivity reaction to the medicine. Patients with moderate to severe heart failure (NYHA Class III/IV). Patients with an active, severe infection (e.g., sepsis).
Pregnancy and lactation eligibility status Pregnancy: Use is only if clearly needed due to potential for placental transfer. Lactation: Infliximab levels are typically very low or undetectable in breast milk.
Eligibility-related restrictions Use requires caution and close monitoring for patients with mild heart failure (NYHA Class I/II). Patients must be screened for Hepatitis B Virus (HBV) infection and monitored for reactivation prior to and during treatment.

Resulting Eligibility Structure

The regulatory profile establishes absolute contraindications for patients with prior severe allergic response or moderate to severe heart failure. Use is not established in children under 6 years of age for the approved pediatric indications. Official labeling defines conditional use by requiring monitoring for geriatric patients and those with a history of demyelinating disorders, ensuring the population meets specific health and age criteria.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interaction Scope

Flix (Infliximab) has a documented interaction profile primarily focused on pharmacodynamic and pharmacokinetic effects, rather than metabolic enzyme interactions. The regulatory documentation explicitly addresses co-administration with other medicines that affect the immune system.

Specific interacting medicines and product categories include Methotrexate and other Immunosuppressants, as well as other Biologic Products (like anakinra and abatacept) and Live Vaccines.

Official Interaction Statements and Restrictions

Co-administration with live vaccines is a formal regulatory restriction, as it is documented to increase the risk of serious infection. Other biologic products used for the same inflammatory conditions are officially not recommended for concurrent use.

There is a documented pharmacokinetic interaction with methotrexate, which results in higher trough concentrations and reduced clearance of Flix. This co-administration is also noted to reduce the formation of antibodies against Flix, a pharmacodynamic effect.

A specific timing rule applies to the pediatric population: live vaccines must not be administered to infants who were exposed to Flix in utero for a recommended period of at least twelve months after birth, due to the documented risk of infection in this population.

Mechanism of Action

Flix initiates its action by binding as an agonist to the intracellular Glucocorticoid Receptor (GR) within airway cells. This activated complex then translocates to the nucleus to perform a dual function: transrepression, which turns off pro-inflammatory genes (like those controlled by NF- kappa B), and transactivation, which turns on anti-inflammatory genes. This fundamental molecular reprogramming restricts the synthesis and release of inflammatory mediators like cytokines and leukotrienes.

By suppressing the underlying molecular cascade, the mechanism promotes a decrease in the number and activity of circulating inflammatory cells, particularly eosinophils, within the airway lining. This reduction in the inflammatory cell load and vascular permeability decreases the formation of airway mucosal edema (swelling) and mucus hypersecretion. Because this action is genomic, the genomic action is the biological basis for modulating chronic inflammation, but the time required for protein synthesis means the mechanism is too slow to reverse acute bronchospasm.

Dosage and Administration Information

How Flix is Used: Official Administration Guidelines

Flix (infliximab) is administered exclusively as an intravenous (IV) infusion in a clinical setting under the supervision of qualified healthcare professionals. The required use pattern is highly structured, involving a precise weight-based calculation and a distinct two-phase dosing schedule. This method ensures the medicine is delivered directly into the bloodstream under controlled conditions.


Dosing and Phased Schedule

Administration follows a multi-dose sequence, structured into an initial phase and a long-term maintenance phase. The starting dose for most approved adult indications, including Crohn's Disease and Ulcerative Colitis, is 5 mg per kilogram (mg/kg) of body weight. A different starting dose of 3 mg/kg is typically used for Rheumatoid Arthritis in conjunction with methotrexate.

Schedule Phase Timing Dose (Typical)
Induction Phase Weeks 0, 2, and 6 5 mg/kg or 3 mg/kg
Maintenance Phase Every 8 weeks thereafter 5 mg/kg or 3 mg/kg

For certain conditions like Crohn's Disease, if the initial response is inadequate or later lost, the dose may be increased to 10 mg/kg or the treatment frequency may be adjusted. Pediatric patients (aged 6 years and older) with approved conditions typically use the 5 mg/kg regimen.


Administration Conditions

Before administration, the powder must be reconstituted and then diluted only with 0.9% Sodium Chloride Injection, and the vial must not be shaken. The diluted solution is administered over a minimum period of two hours. If a scheduled infusion is missed, official guidance recommends administering the dose as soon as feasible, and the schedule for subsequent doses should be adjusted accordingly. No specific dose adjustments are required for older adults or patients with renal or hepatic impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Flix (Fluticasone)


Evidence for Use in Persistent Asthma

The primary research for Flix (fluticasone) in asthma consists of numerous Randomized Controlled Trials (RCTs), supported by systematic reviews and meta-analyses. These trials was studied for people with persistent asthma, including adults, adolescents, and children over four years old, used in research exploring how symptoms change over time. Researchers examined outcomes related to systemic or functional imbalance, such as changes measured in lung function ( FEV1), and outcomes describing episodic or acute changes, specifically patterns of change in the frequency of asthma exacerbations.

Studies report how symptoms evolved in the observed populations, describing patterns observed in the studies related to changes measured in lung function and event rates over the trial periods. Research explored whether different dosages result in measurable changes and found that higher dosages was observed in some studies to yield similar measurements compared to medium dosages. The long-term stability of these measured outcomes is continuously monitored through ongoing observational research.


Evidence for Use in Chronic Obstructive Pulmonary Disease (COPD)

The research into Flix for Chronic Obstructive Pulmonary Disease (COPD) research examined large, long-term RCTs, often lasting one to three years. These studies primarily focused on adults with moderate to severe COPD, especially those with a history of recurrent episodes where symptoms become more noticeable. The main outcomes monitored were the annualized rate of outcomes describing episodic or acute changes (severe COPD exacerbations) and measurements related to health status and quality of life.

Studies reported measurements related to the rate of severe exacerbations over the study intervals. However, when researchers explored the potential impact of Flix on the long-term progression of COPD, measured by the rate of decline in lung function ( FEV1), findings were mixed. The impact on overall survival was not a primary focus of the available research.


What the Research Indicates is Still Uncertain

Scientific literature highlights several areas where certainty remains low:

  • Long-Term Impact: The full profile of long-term effects, especially regarding potential systemic outcomes from sustained use and the impact on disease progression, is not fully established.
  • Subgroup Findings: Subgroup findings are uncertain for specific patient groups. Comparative evidence is lacking in some areas to definitively describe how Flix performs against every single alternative medicine in terms of all long-term outcomes. Findings describe group patterns, not personal outcomes, and research does not determine whether an individual will respond similarly.

Key Studies & References Meta-analysis of inhaled corticosteroids for allergic rhinitis: PubMed Central (Representative Source)

Frequently Asked Questions (FAQ)

Common questions about Flix (FAQ)

Q: Is Flix the same type of medicine as other treatments for this condition?

A: Flix is classified in official documents as a specific class of medication, such as an inhaled corticosteroid or a TNF- alpha inhibitor. This classification is based on its primary function and molecular target, which distinguishes its mechanism from other general treatment approaches like bronchodilators or alternative biologics.

Q: How quickly should I expect to notice Flix starting to work?

A: The medicine's purpose is to modulate chronic inflammation over time through its genomic action, meaning it is not designed to stop sudden or acute symptoms. Official studies describe observing changes related to long-term control of the condition, and the time required for changes to become noticeable is variable. A specific, universal timeframe for individual response onset is not provided.

Q: What is the longest period someone typically uses Flix for?

A: Flix is intended for chronic conditions and is designed to be administered in a long-term maintenance phase following the initial treatment phase. Regulatory materials and clinical data describe use that continues over multiple years, often for the duration required to help control the chronic condition.

Q: Can Flix be taken by someone who is already taking common pain relievers?

A: Official drug interaction documents focus primarily on significant interactions with medicines that affect the immune system, such as other biologics and live vaccines. Common, non-prescription pain relievers are generally not highlighted as primary interactions. Official guidance emphasizes the importance of disclosing all current medications and supplements for a complete review.

Q: Is it true that Flix interacts with certain vitamins or herbal supplements?

A: Official product information explicitly lists interactions with certain prescription medicines and product types. Some formulations of Flix may carry a warning about potential interactions with strong enzyme inhibitors, which can sometimes be found in specific herbal products. Official guidance indicates that all supplements should be disclosed for a complete assessment.

Q: Can Flix be taken if a person has certain pre-existing heart conditions?

A: Official regulatory documents state that Flix is contraindicated (should not be used) in patients who have moderate to severe heart failure (NYHA Class III/IV). Use requires special consideration, caution, and close monitoring in patients who have mild heart failure (NYHA Class I/II).

Q: Is there evidence about the safety of Flix during pregnancy or breastfeeding?

A: Regulatory guidelines indicate that the medicine is typically used during pregnancy only if clearly needed, due to the potential for the medicine to cross the placental barrier. Official studies on the IV infusion product (infliximab) indicate that levels of the medicine are usually very low or undetectable in breast milk.

Q: Is there a warning about driving or operating machinery while using Flix?

A: Official safety sections note that common side effects, such as headache and fatigue, may occur. Less common effects like dizziness or vision changes have also been reported. Regulatory information indicates that patients should be aware of how the medicine affects them before driving or operating machinery.

Q: Do children or teenagers ever use Flix for their conditions?

A: Yes, official regulatory approval exists for specific pediatric populations. For the IV infusion product (infliximab), this includes patients 6 years and older for certain approved conditions. For the inhaled corticosteroid product (fluticasone), use is approved in children generally 4 years and older for asthma prevention.

Q: Does Flix have any specific dietary restrictions mentioned in the official documents?

A: Official regulatory documents generally do not list specific food restrictions for Flix. The absorption and clearance of the IV infusion product (infliximab) is not generally influenced by diet. Regulatory documents do not specify any required changes to a patient's diet in relation to Flix.

Q: Why do some people experience initial tiredness when starting Flix?

A: Fatigue is listed in official documents as a Very Common adverse reaction, meaning it has been reported in more than 1 in 10 patients in clinical trials. Regulatory information provides the frequency of this effect but does not offer a specific mechanism or explanation for its timing or onset.

Q: If I feel better, should I stop taking Flix?

A: Flix is intended as a long-term controller medicine for chronic conditions, used regularly according to the formal schedule. Discontinuation of the medicine is typically a decision that involves a formal disease re-assessment, as Flix is used for long-term control rather than as a short-term, symptom-dependent treatment.

Q: Are there any common lab tests that people on Flix need to have?

A: For the IV infusion (infliximab), official documents require specific screenings before treatment, such as testing for Hepatitis B Virus (HBV) and Tuberculosis (TB). Monitoring for these and other signs of infection is also required during the course of treatment.

Q: Does Flix have a risk of dependence or withdrawal issues?

A: Official regulatory documents, primarily focused on the IV infusion product (infliximab), do not indicate a risk of dependence or addiction. Discontinuation is associated with a return of underlying disease activity, which is not classified as a dependence or withdrawal syndrome in regulatory documents.

Q: How long does it take for Flix to be completely out of the body?

A: Official documents describe the half-life of the medicine (infliximab) in the bloodstream, which is approximately 8 to 9.5 days. The medicine is considered to be fully eliminated from the body after several half-lives have passed.

Q: Can Flix affect my mood or sleep patterns?

A: Official safety information notes the occurrence of certain central nervous system effects. While not listed as common, this includes reports of symptoms related to mood or sleep changes (e.g., dizziness or insomnia) in patients using the medicine.

Q: Do studies suggest Flix works better for some patient subtypes than others?

A: Official research summaries note that while trials involve a broad population, findings for specific patient subgroups are described as uncertain. Research is generally designed to describe patterns observed in the overall study population, not to provide definitive statements on individual response.

Q: Is Flix known to cause any long-term changes to organs?

A: Safety data includes reports of serious, rare events such as blood and lymphatic system disorders, severe cardiac failure, and the potential for developing certain malignancies. Regulatory documents note that the full profile of long-term effects from sustained use is not fully established.

Q: Is it normal to feel a change in appetite when starting Flix?

A: Official safety documents list common gastrointestinal adverse reactions such as nausea and abdominal pain. While a specific change in appetite is not always listed as a frequent side effect, these related GI issues are commonly reported.

Q: Are there specific food types that are known to change how Flix is absorbed?

A: For the IV infusion (infliximab), official regulatory documents do not specify food types that change its absorption. The inhaled product (fluticasone) has very low systemic absorption, meaning that food is not generally a factor in how it is utilized by the body.

Q: Why is it important to know who cannot use Flix?

A: Regulatory bodies require explicit contraindications because the medicine is associated with risks of serious infections (e.g., tuberculosis), severe heart failure, or severe allergic reactions in specific patient groups. These restrictions are formally documented to help reduce these known, documented risks.

Q: What is the typical timeframe for maximum effect of Flix?

A: Clinical trials for the IV infusion (infliximab) often monitor responses over weeks and months, with some studies defining the period for achieving a major clinical response as being by a set point, such as Week 14. For inhaled products (fluticasone), the anti-inflammatory effect builds over time, with maximum benefit often observed after days or weeks of consistent use.

Q: Does Flix work for all symptoms of the condition, or just some?

A: The medicine is described as primarily working by reducing underlying inflammation and swelling associated with the condition. Official studies measure changes in specific functional markers, such as lung function or rates of disease exacerbations, rather than addressing all subjective symptoms.

Q: Is there any public health advisory related to Flix?

A: Official documents include prominent warnings regarding the risk of serious infections and malignancies (often presented as a Boxed Warning in the US). This type of warning represents a serious communication from regulatory bodies regarding potential, documented risks.

Q: How common are the side effects listed in the product insert for Flix?

A: Official documentation categorizes side effects by frequency based on clinical trials. For example, adverse events may be listed as Very Common (occurring in more than 1 in 10 patients) or Common (occurring in up to 1 in 10 patients), providing a factual, statistical estimate of occurrence.

Q: Are there different forms (like tablet vs. liquid) available for Flix?

A: Flix is primarily available as a powder for reconstitution, which is then administered as an intravenous infusion (infliximab). For the inhaled form (fluticasone), it is available as a metered-dose inhaler or nasal spray, but it is not available as an oral tablet.

Q: What are the conditions for using Flix as outlined by official bodies?

A: Official conditions for use include being approved for specific diseases and age groups (e.g., adults and children). Use is further restricted by contraindications, such as a prior severe allergic reaction or the presence of moderate to severe heart failure.

Q: Is there a maximum time that Flix is recommended to be used continuously?

A: For the IV infusion (infliximab), there is typically no stated official maximum treatment duration; the maintenance phase is continued as long as the treatment remains effective and is tolerated. For some inhaled corticosteroid products, use is regulated for specific time periods when sold over-the-counter.

How should Flix be stored and disposed of?

How to Store and Dispose of Flix (Infliximab)

Official regulatory documents define strict storage and disposal requirements for Flix, based on its characteristics as an injectable biologic.

Storage Conditions

Requirement Official Regulatory Statement
Temperature Unopened vials must be stored under refrigeration between 2 C and 8 C.
Protection The product must not be frozen; if freezing occurs, the vial must be discarded. Vials must remain in the original carton to protect the contents from light.
Stability After preparation (reconstitution and dilution), the solution must be used immediately or stored for a maximum of 24 hours under refrigeration.
Child Safety The medicine must be kept out of the sight and reach of children.

Disposal Instructions

Disposal of any unused, expired, or residual Flix and associated materials must follow local pharmaceutical waste regulations. The medicine must not be disposed of via wastewater or routine household trash to prevent environmental contamination.

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

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