Flagass

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Flagass

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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 Flagass

Quick Facts

Property Description
Active Ingredients Dimethicone, Homatropine Methylbromide
Common Forms Oral tablets, Oral solution/drops
Pharmacological Class Anti-flatulent, Anticholinergic/Antispasmodic
General Purpose Relief of abdominal gas, bloating, and spasms
Origin Synthetic combination product

Flagass: Definition and Pharmacological Classification

Flagass is a fixed-dose combination pharmacological preparation classified concurrently as an anti-flatulent agent and an anticholinergic/antispasmodic agent. This structure is clinically recognized for addressing a confluence of gastrointestinal symptoms.

The medicine’s active components are the silicone-based polymer Dimethicone and Homatropine, typically supplied as the salt Homatropine Methylbromide. Homatropine methylbromide belongs to the group of belladonna alkaloids, semisynthetic, quaternary ammonium compounds. This preparation is entirely synthetic in origin.

What are Dimethicone and Homatropine Made For?

The fundamental purpose of Flagass is to relieve symptoms of abdominal bloating, trapped intestinal gas, and associated painful spasms or cramping. The combined approach involves reducing gas surface tension alongside smooth muscle relaxation.

The Dimethicone component acts locally by reducing the surface tension of liquid within the gut, causing countless small, trapped gas bubbles to merge for easier expulsion. Conversely, the Homatropine component provides an antispasmodic effect by relaxing the smooth muscle of the gut. The overall therapeutic goal is to provide comprehensive relief for digestive distress stemming from pressure and muscular pain.

Available Forms: Tablets vs. Oral Drops

Flagass is an orally administered medicine commonly available as both oral tablets and a liquid oral solution/suspension, frequently referred to as drops. This provision of multiple dosage forms allows the product to be consumed by different patient groups, with both designed for oral consumption into the digestive tract.

Regulatory References

  1. NIH MedlinePlus on Simethicone

What side effects are possible with Flagass?

Possible Side Effects and Safety Information

The safety profile of Flagass, a combination of Dimethicone and Homatropine Methylbromide, is primarily defined by the known effects of the anticholinergic component. Official regulatory documents classify potential adverse reactions based on severity and the body system affected.


Adverse Reactions and System-Organ Classification

Adverse effects are categorized by frequency and the System Organ Classes (SOCs) involved, as documented in governmental prescribing information. Common adverse reactions include dry mouth, constipation, nausea, and headache. Other reactions, reported with frequency Not known, involve the Nervous System Disorders (e.g., dizziness, somnol), Eye Disorders (e.g., visual accommodation disorders or blurred vision), and Genitourinary System Disorders (e.g., urinary retention).


Serious Adverse Reactions and Safety Constraints

Official labeling addresses the risk of serious adverse reactions. The medicine is contraindicated in patients with conditions that could be exacerbated by anticholinergic effects. These constraints include a known history of narrow-angle glaucoma and certain conditions leading to gastrointestinal obstruction, such as paralytic ileus. The regulatory documents also note the risk of severe hypersensitivity reactions.


Population-Specific Safety Considerations

The prescribing information includes specific cautions for certain patient groups. Older adults may exhibit increased sensitivity to anticholinergic effects, including a higher risk of confusion, constipation, and urinary retention. Caution is also advised in patients with conditions such as prostatic hypertrophy and in those with severe impairment of hepatic or renal functions, as defined in the official regulatory texts.

Overdose and Emergency Response

Overdose and When to Seek Help

The official overdose profile for Flagass is solely determined by the systemic effects of the Homatropine Methylbromide component, as the Dimethicone component is pharmacologically inert and non-absorbed.

Documented Overdose Manifestations

Overdose presents as an exaggeration of anticholinergic effects. Regulator-documented manifestations include a cluster of symptoms such as tachycardia (abnormally fast heart rate), palpitations, blurred vision, and physical signs like dry mouth and flushing. Severe gastrointestinal or genitourinary distress, specifically severe constipation and urinary retention, are also officially documented. Severe overexposure may lead to life-threatening outcomes, including severe hypotension, paralytic ileus, and respiratory depression.

Immediate Actions and Monitoring Requirements

Any suspected overdose requires immediate medical attention. Regulatory authorities mandate that individuals must contact emergency services or a certified Poison Control Center immediately. For established overdose, hospital monitoring is required, often involving continuous cardiorespiratory monitoring (ECG) to manage potential complications. Treatment is defined as symptomatic and supportive treatment and may involve gastric decontamination procedures. Official documentation confirms that no specific antidote is known for routine use. Special considerations are noted for elderly patients and children due to increased susceptibility to toxicity.

Therapeutic Uses of Flagass

Symptomatic Relief for Gas, Bloating, and Pressure

Flagass is commonly used to help with symptom clusters that may become intense or disruptive, such as those caused by excessive intestinal gas, including uncomfortable abdominal distension, palpable bloating, and increased flatulence. The anti-flatulent component is commonly used for managing symptoms related to physical discomfort. This provides crucial support that helps ease the overall symptom burden, offering symptomatic relief that may help patients cope more steadily with difficult episodes.

This medication is relevant in clinical settings marked by heightened patient distress from painful spasms and episodes of cramping, a key feature of conditions like Irritable Bowel Syndrome (IBS) and functional dyspepsia. It is applied during phases where the patient experiences heightened discomfort, contributing to improved day-to-day comfort and supporting stability when symptoms become more noticeable. It is commonly used to help with managing conditions that present with acute or episodic manifestations, including abdominal pain, cramping, bloating, and windy colic in infants.

“The primary benefit is supportive relief across symptom clusters that involve physical discomfort and functional strain.”


Quick Fact: Relief for Dual GI Distress
Primary Symptom Axes Symptoms related to physical discomfort, symptoms of increased neurological or muscular activity
Key Indications Irritable Bowel Syndrome, Functional Dyspepsia
Patient Benefit Focus Supports general well-being and helps ease the overall symptom load
Contextual Use Used during episodic symptom escalation or acute flare-ups

Regulatory References

  1. NIH StatPearls overview

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Flagass — Official Regulatory Information

The eligibility status for Flagass (Dimethicone + Homatropine Methylbromide) is defined strictly by population restrictions found in government regulatory documents.

Eligibility Scope Regulatory Classification and Rules
Populations for whom use is allowed Adults and adolescents (typically 12 years and older) under standard labeled conditions.
Populations for whom use is not recommended Pregnant or breastfeeding individuals; patients with severe renal or hepatic impairment.
Populations for whom use is contraindicated Individuals with hypersensitivity to components; patients with gastrointestinal obstruction (e.g., paralytic ileus), narrow-angle glaucoma, Myasthenia Gravis, or toxic megacolon.

Age-Related Eligibility Rules

  • Pediatric patients under the minimum approved age (e.g., under six years) are generally contraindicated or not recommended. Safety and effectiveness have not been established in this age group.
  • Older adults require use with caution due to increased susceptibility to anticholinergic effects, as documented in geriatric-use sections.

Connection to the overall eligibility profile

Regulatory documents define who can and cannot use this medicine by establishing absolute contraindications related to anticholinergic effects, such as glaucoma and intestinal obstruction, which prohibit use. Eligibility is further structured by age-based exclusions and restrictions requiring conditional use in patients with specific organ function impairments or underlying health conditions.

What should I know about interactions with other medicines?

The official interaction profile for Flagass is defined by the pharmacodynamic effects of the Homatropine Methylbromide component and the non-systemic action of Dimethicone. This profile focuses on restrictions related to additive effects and physical interference.


Pharmacodynamic and Clearance Interactions

Co-administration with other anticholinergic drugs is officially noted in regulatory documents to cause pharmacodynamic reinforcement. This interaction increases the potential for severe additive anticholinergic adverse effects, including an elevated risk of paralytic ileus. Furthermore, the therapeutic efficacy of certain laxative agents may be diminished when taken concurrently due to the reduction in gastrointestinal motility. Clearance constraints are also noted: patients with severe renal impairment or severe hepatic impairment may experience altered elimination kinetics of the anticholinergic component, which can lead to increased systemic exposure.


Timing and Substance Interactions

The non-systemic Dimethicone component requires that its administration be separated in time from certain other oral medications. This timing rule is necessary to prevent the potential physical interference with the absorption of the other oral treatment. No significant metabolic (CYP-mediated) or transporter-mediated interactions are documented in regulatory labeling for this combination. Additionally, no specific interactions are formally documented with alcohol, food, or herbal products.

Mechanism of Action

The mechanism of action for Flagass is defined by its activity as a surface-active agent (surfactant), which is a physical rather than a pharmacological interaction. This mechanism is confined to the gastrointestinal (GI) tract lumen, acting solely on the luminal contents without requiring systemic absorption. Flagass functions by lowering the surface tension of the small, stable gas bubbles (foam) that become trapped within the liquid and semi-liquid contents of the stomach and intestine. This mechanical disruption forces the numerous smaller foam bubbles to lose stability and coalesce into fewer, larger gas volumes. This modification of the physical state, distribution, and overall volume of entrapped luminal gas defines the extent of the drug's activity within the GI system.

Dosage and Administration Information

How to Use Flagass: Official Administration Guidelines

Flagass is a fixed-dose combination product containing Dimethicone and Homatropine Methylbromide, and its usage is strictly defined by regulatory prescribing information for oral administration. This section details the high-level, label-based instructions for its consumption.


Administration Protocol

The medicine is restricted to the oral route and is administered as tablets, capsules, or an oral suspension (drops). The standard adult dosing regimen specifies a typical dose range of 40 mg to 125 mg of the Dimethicone component per intake. This dose is scheduled to be taken four times daily (QID), with the prescribed timing being after each meal and at bedtime. The official regulatory limit dictates that the maximum total daily intake for the Dimethicone component must not exceed 500 mg for adults and adolescents, and adherence to this limit is a mandatory procedural condition.


Preparation and Age-Specific Use

Specific preparation requirements ensure proper administration. The oral solution or drops must be shaken well immediately before use, and the liquid must be measured accurately using a calibrated measuring device. Chewable tablet forms are required to be chewed thoroughly before being swallowed. For pediatric use, a different daily limit applies: infants and children under two years old are limited to a maximum daily intake of 240 mg of the Dimethicone component. The product is primarily designated for short-term, episodic use to manage acute symptoms, and continuous administration must follow a specific professional regimen.


Handling Missed Timing

If a scheduled dose is forgotten, the official instruction is to take the dose when remembered, provided it is not close to the time of the next scheduled intake. If it is near the next dose, the user must skip the missed dose and continue with the regular schedule, with regulatory documentation explicitly prohibiting taking two doses at once.

Recent Clinical Evidence

Research evidence / Overview of studies for Flagass

Evidence for Use in General Gastrointestinal Distress (Gas, Bloating, and Spasms)

Research examining Flagass, and similar fixed-dose combinations, was studied for co-occurring symptoms of abdominal gas, bloating, and painful spasms. These studies were applied in research contexts involving conditions characterized by fluctuating or episodic manifestations, such as the symptoms experienced during acute phases of Irritable Bowel Syndrome (IBS). The evidence base includes short-term Randomized Controlled Trials (RCTs) and systematic reviews. These studies monitored patient-reported experiences related to co-occurring gas, bloating, and painful cramping.

The trials tracked patient-reported outcomes describing perceived discomfort. Studies monitored various patient-reported outcomes, including scores related to the severity and frequency of abdominal pain and bloating over defined time intervals. Findings describe patterns observed in the studies related to outcomes reflecting daily functioning or activity level.

Evidence for Use in Functional Dyspepsia (FD)

Flagass was evaluated in conditions marked by functional limitations in the upper digestive tract, known as Functional Dyspepsia. The evidence base here is generally centered on the Dimethicone component alone, with research examining outcomes related to physical discomfort. Findings describe patterns observed in these studies, but reported measurements for the anti-flatulent component have sometimes been mixed regarding overall symptom patterns in certain Functional Dyspepsia populations.

The Current Landscape of Long-Term Studies and Follow-up

Research has explored short-term symptom changes. The majority of studies monitored responses over defined time intervals, typically ranging from two to eight weeks. The follow-up durations covered acute or episodic changes in symptoms. Long-term effects are not fully established. There is limited information for long-term outcomes characterizing symptom variability over many months or years.

Research Gaps and Areas of Scientific Uncertainty

A key limitation is that comparative evidence is lacking between the fixed-dose Flagass combination versus each agent taken alone. Evidence quality varies across studies. Subgroup findings are uncertain, as most trials do not provide sufficient detail to understand how outcomes differ significantly across patients with varying symptom severity or different subtypes of IBS. These research gaps highlight what is known and what is still uncertain.

Key Studies & References

  1. Irritable Bowel Syndrome: Clinical Presentation and Treatment
  2. Simethicone (Dimethicone) in Functional Gastrointestinal Disorders: A Comprehensive Review
  3. WHO ATC Index: A03BB06 Homatropine methylbromide

Frequently Asked Questions (FAQ)

Common questions about Flagass (FAQ)

Q: How long does Flagass stay in the body after the last use?

A: Flagass is a combination product where the Dimethicone component works only inside the digestive tract and is not absorbed into the body. The Homatropine component is a quaternary salt, which is poorly absorbed from the digestive tract, meaning only limited amounts enter the bloodstream before being eliminated. The drug's short-term, episodic use profile suggests the clearance from the body would be rapid.


Q: Does Flagass have known interactions with alcohol?

A: Regulatory documents state that no specific formal interaction between Flagass and alcohol is documented. However, the medicine is associated with potential side effects such as dizziness and sleepiness (somnolence). Because alcohol can also cause these effects, official information indicates that caution is appropriate when combined with alcohol.


Q: Does Flagass interact with commonly used vitamin or herbal supplements?

A: Official product information indicates that no specific interactions are formally documented with herbal products or vitamins. As a general principle, the Dimethicone component requires administration to be separated in time from other oral medications. This timing rule is noted to prevent the potential physical interference with the absorption of the other oral treatment.


Q: How long does it typically take to feel the first effects of Flagass?

A: Official regulatory documents do not provide a specific time frame for the onset of effects. However, the Dimethicone component works by a physical action that is local to the gut contents, suggesting its action is not tied to systemic absorption. The Homatropine component is also released and acts within the digestive system.


Q: What should I know about taking Flagass with common over-the-counter pain relievers?

A: The non-systemic Dimethicone component requires that its administration be separated in time from certain other oral medications, including over-the-counter pain relievers. This timing rule is noted to prevent the potential physical interference with the absorption of the other oral treatment.


Q: Are there any foods or beverages that can interact with Flagass?

A: Regulatory documents formally state that no specific interactions are documented with food or herbal products. The timing instructions for taking the medicine are set relative to meals (for example, after each meal and at bedtime). No significant metabolic interactions are documented for the combination.


Q: What information is available regarding the long-term effects of Flagass?

A: Regulatory-reviewed research information indicates that studies have focused primarily on short-term symptom changes, typically over time intervals of two to eight weeks. Information states there is limited data available for long-term outcomes characterizing symptom variability over many months or years.


Q: What types of allergic reactions are associated with Flagass?

A: Official labeling addresses the risk of severe hypersensitivity reactions to the components of Flagass. Signs of a severe hypersensitivity reaction are generally described as swelling, rash, hives, and difficulty breathing.


Q: Can Flagass be taken with acid reflux medications?

A: The non-systemic Dimethicone component requires that its administration be separated in time from certain other oral medications, which includes acid-reducing agents. This is noted in official documentation to prevent potential physical interference with the absorption of the other oral treatment.


Q: Does Flagass cause issues with sleep or insomnia?

A: The official safety profile for Flagass lists somnolence (sleepiness) as an adverse reaction with frequency 'Not known.' Insomnia (trouble sleeping) is not listed in the common or known adverse reactions.


Q: Can Flagass impact a person's ability to drive or operate machinery?

A: The medicine is associated with potential adverse reactions such as dizziness, sleepiness, and blurred vision. Because of these potential effects on mental and visual alertness, official information indicates that caution is appropriate regarding activities that require full attention, such as driving or operating heavy machinery.


Q: Does Flagass have a known interaction with grapefruit or grapefruit juice?

A: Regulatory documentation states that no significant metabolic (CYP-mediated) or transporter-mediated interactions are documented for the Flagass combination. Furthermore, no specific food interactions, including those with grapefruit, are formally documented in the product information.


Q: What if I start using a new prescription drug; does it always interact with Flagass?

A: Not every medicine interacts with Flagass. Regulatory documentation describes two main types of interactions: physical interference with other oral treatments, which is described as requiring a separation in time, and pharmacodynamic reinforcement with other anticholinergic drugs, which requires caution due to increased side effect potential.


Q: Does Flagass interact with any common cough or cold medicines?

A: Some cough and cold medicines may contain other anticholinergic drugs. Official regulatory documents warn that combining Flagass with other anticholinergic drugs can cause pharmacodynamic reinforcement, which may increase the potential for additive anticholinergic adverse effects.


Q: How long after stopping Flagass is it safe to consume alcohol or certain foods?

A: The Flagass product is designated for short-term, episodic use. Since the active components are either non-absorbed or poorly absorbed, the clearance from the body would be expected to be rapid. There are no specific consumption restrictions documented for foods or alcohol related to the drug’s short-term, episodic use profile.


Q: Why are there different strengths or forms of Flagass (e.g., tablet vs. capsule)?

A: Flagass is commonly available as both oral tablets and a liquid oral solution/suspension (drops). This provision of multiple dosage forms, as noted in the product information, is intended to allow the medicine to be consumed by different patient groups according to their needs.


Q: Is it normal to have stomach upset when first starting Flagass?

A: Nausea is listed in official documentation as a common adverse reaction for Flagass. Other common adverse reactions include constipation and dry mouth. These effects are based on reports from regulatory-reviewed safety information.


Q: Does Flagass work for all patients who are prescribed it?

A: Regulatory-reviewed research information includes findings where reported measurements for the anti-flatulent component have sometimes been mixed regarding overall symptom patterns in certain populations. Official documents also indicate that subgroup findings (outcomes for specific patient types) are uncertain.


Q: Can Flagass be taken with other medications for the same condition?

A: Flagass contains an anticholinergic component. Co-administration with other medicines for the same condition is restricted if they also have anticholinergic properties, as this could lead to additive anticholinergic adverse effects, as described in official labeling.


Q: Is Flagass a long-term or short-term medication?

A: According to official administration protocols, Flagass is primarily designated for short-term, episodic use to manage acute symptoms. Continuous administration is defined in regulatory documentation as following a specific professional regimen.

How should Flagass be stored and disposed of?

How to Store and Dispose of Flagass

Flagass (Dimethicone/Homatropine Methylbromide) must be stored under specific environmental and container conditions to maintain its labeled stability.


Storage Requirements

  • Temperature: Store at controlled room temperature, specifically between 20°C and 25°C (68°F and 77°F). Brief excursions up to 30°C are permitted. Do not freeze the medicine.
  • Protection: The product must be protected from light and moisture and kept in its original, tightly closed container.
  • Child Safety: Keep Flagass out of the reach and sight of children at all times.

Disposal Instructions

  • General Disposal: Dispose of unused or expired medicine and packaging according to local regulatory requirements.
  • Environmental Protection: Check for local medicine take-back programs. The product should not be disposed of via wastewater (e.g., sink or toilet) unless specifically permitted by an official authority.

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

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