Симетикон

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Симетикон

Treatment option: Dyspepsia, Flatulence

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Симетикон

What is Simethicone and What is it Used For?

Property Description
Active Ingredient Simethicone (Polydimethylsiloxane and Silicon Dioxide)
Common Forms Drops, Capsules, Softgels, Chewable Tablets
Pharmacological Class Antiflatulent / Antifoaming Agent
Common Use Symptomatic relief of gas, bloating, and flatulence
Origin Synthetic, Chemically Inert Compound

Simethicone is an International Nonproprietary Name (INN) designating an antiflatulent medicine used primarily for the symptomatic relief of gas-related issues, such as bloating, abdominal discomfort, and flatulence caused by excess gas in the gastrointestinal tract. This compound is widely recognized for its efficacy in non-specific gas problems, including preparation for abdominal ultrasound and radiography.

This substance belongs to the silicone-based surfactant pharmacological class. Simethicone does not cross the gastrointestinal barrier, ensuring minimal systemic exposure. The general conclusion for patients is that Simethicone acts only where the gas is located and is not absorbed into the bloodstream.


Simethicone: Substance Type and Composition

Simethicone is a synthetic substance, an inert compound derived from silicone, composed of a blend of polydimethylsiloxane (PDMS) and silicon dioxide. This composition is the core feature that distinguishes it from absorbable anti-gas agents. A significant feature is its inert nature, meaning it does not interfere chemically with digestive acids or other medicines.

Popular over-the-counter (OTC) products contain this active ingredient and often offer specialized formulations such as flavored drops specifically targeted at infants and young children.


In What Forms is Simethicone Available?

Simethicone is available in several oral dosage forms to suit different patient needs, including drops or oral suspensions (ideal for liquid administration), chewable tablets, softgels, and capsules. The variety of forms ensures patients of all ages can access effective relief from gas symptoms via the oral route of administration.

What side effects are possible with Симетикон?

Simethicone: Possible Side Effects and Safety Information

Simethicone's safety profile, as outlined in official government regulatory documents, is characterized by its chemically inert nature and lack of systemic absorption. Consequently, adverse reactions are primarily localized to the gastrointestinal tract or involve rare systemic allergic responses.

Documented Adverse Reactions and Frequencies

Regulatory documentation classifies reported side effects, typically based on post-marketing data:

System Organ Class Adverse Reaction Frequency Classification (Regulatory Standard)
Gastrointestinal Disorders Nausea, Vomiting Not Known (Cannot be estimated)
Gastrointestinal Disorders Constipation Uncommon (Reported in some labels)
Immune System Disorders Hypersensitivity Reactions (e.g., rash, pruritus) Not Known or Rare (e.g., 1/10,000 to 1/1,000)

Serious Adverse Reactions

The most significant documented safety concern involves severe hypersensitivity reactions, which are formally classified as Rare. These reactions may manifest as swelling of the face or tongue (oedema) and respiratory difficulty, and are listed under Immune System Disorders in regulatory frameworks.

Safety Considerations for Special Populations

Due to the negligible systemic exposure of Simethicone, official regulatory texts indicate that no adverse effects are anticipated during pregnancy or breast-feeding. The compound is primarily contra-indicated only in individuals with a known hypersensitivity to the active substance or any of its excipients. Additionally, regulatory safety notes document that Simethicone may impair the absorption of Levothyroxine when the two are administered concurrently.

Overdose and Emergency Response

Overdose and when to seek help

Overdose Scope Official Regulatory Statement
Documented Manifestations No known systemic symptoms, clinical signs, or laboratory abnormalities are documented. The compound is physiologically inert.
Systemic Risk Systemic toxic effects are unlikely due to the compound's lack of systemic absorption. No specific systemic organs are listed as being affected.
Emergency Action Seek professional assistance or contact a Poison Control Center immediately.
Antidote No specific antidote is known; management is limited to discontinuing the medication.

The official regulatory profile for Simethicone is defined by its pharmacokinetic properties, establishing it as a non-absorbed and physiologically inert substance. Consequently, official labeling reports no documented systemic symptoms or clinical signs of overdose. Due to the lack of systemic absorption, severe or life-threatening outcomes, such as cardiovascular or neurological toxicity, are considered unlikely by regulatory authorities.

The management in overdose is non-specific, as no specific antidote is known. Procedural steps are limited to the discontinuation of the medication. Regardless of the minimal systemic risk, the official labeling mandates the specific instruction to seek immediate medical attention or to contact a Poison Control Center immediately in the event of accidental overdose or significant excess exposure. This adherence to regulatory instruction ensures professional guidance is obtained in all overdose scenarios.

Therapeutic Uses of Симетикон

Easing Abdominal Pressure and Gas Discomfort

Simethicone is commonly used to help with symptomatic relief from symptoms related to physical discomfort caused by excessive gastrointestinal gas. This helps address symptom clusters such as the feeling of uncomfortable pressure, distention, and visible bloating, which are symptoms that interfere with daily functioning. The medication is applied across domains where additional symptomatic support is needed. It is considered relevant in conditions characterized by periods of heightened symptoms such as general flatulence, belching, and postoperative gas pain. This use contributes to improved comfort during periods of heightened symptoms and supports the patient during difficult episodes by easing distress.

“Simethicone is relevant when supportive symptom management is appropriate for the physical strain of trapped air.”

The medication may assist with managing symptoms associated with infant colic and is applied for clinical preparation to support visualization during diagnostic procedures like ultrasound or radiography.


Quick Fact: Relief for Gas-Related Symptoms

Simethicone supports general well-being during symptomatic phases by helping to ease the overall symptom load of physical discomfort and disruptive gas manifestations.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Official Eligibility and Contraindications

Simethicone's eligibility is largely defined by its non-systemic absorption, which limits restrictions to specific acute conditions and individual allergies, as mandated by regulatory bodies like the EMA and FDA.

Population Status Official Regulatory Stance
Eligible for Use Adults, adolescents, children, and infants (including newborns).
Accepted Conditional Use Pregnancy and lactation.
Absolute Contraindication Known hypersensitivity to the active substance or excipients.
Condition Prohibition Suspected or known gastrointestinal perforation or obstruction.

Age-Related Eligibility

Simethicone is officially eligible for use across all age groups, from adults to infants, with specific formulations (like drops) approved for the pediatric population. The safety profile is considered acceptable for use in older adults without the need for specific dosage adjustments or restrictions.

Comorbidity-Based Restrictions

Due to the compound being chemically inert and not absorbed from the gastrointestinal tract, official regulatory labeling typically documents no specific restrictions for use in patients with hepatic (liver) impairment or renal (kidney) impairment.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Simethicone is a chemically inert compound that regulatory authorities classify as having no significant systemic interactions. Because it is not absorbed into the bloodstream across the gastrointestinal barrier, official labeling confirms the absence of typical pharmacokinetic interactions, such as those involving hepatic CYP450 enzymes or drug transporters (P-gp).


The primary interaction documented in regulatory prescribing information is a local physical absorption interference with certain medicinal products, which can reduce their exposure in the body. This interaction is not metabolic but results from the physical presence of Simethicone in the gut.

Documented Exposure-Altering Interaction

The most notable interaction involves thyroid hormones, specifically Levothyroxine and Liothyronine. Co-administration with Simethicone may lead to reduced absorption of these thyroid replacement agents. This can diminish the expected pharmacological effect of the thyroid hormone, requiring a procedural constraint to maintain its efficacy.

Element Regulatory Statement
Specific Interacting Medicines Levothyroxine, Liothyronine (Thyroid Hormones)
Mechanistic Classification Physical Absorption Interference
Timing-Based Restriction Administration must be separated by several hours to prevent reduced absorption and decreased efficacy of the thyroid hormone.

Regulatory documents do not list formal interaction warnings or restrictions regarding co-consumption with food, alcohol, or herbal supplements, consistent with the drug's inert profile.

Mechanism of Action

Mechanism of Foam Destabilization

The primary function of Simethicone is a physicochemical action targeting the surface tension of the numerous small gas bubbles trapped in the digestive tract. The active component, Polydimethylsiloxane (PDMS), acts as a non-systemic surfactant, rapidly spreading across the bubble films. This physical interaction significantly lowers the surface tension, causing the fragile foam structure to destabilize and rupture.


Cascade of Gas Coalescence and Clearance

Once the foam structure collapses, the mechanistic cascade leads to coalescence: the many tiny, released gas bubbles merge into larger pockets of free gas. This merging is supported by the synergistic presence of Silicon Dioxide, which ensures optimal defoaming efficiency. This conversion from immobile foam to free gas is a key physiological adjustment that facilitates the expulsion of the gas from the body via natural processes (eructation or flatus). This shift in gas mobility subsequently decreases the physical pressure exerted against the intestinal wall.

Dosage and Administration Information

Official Administration Guidelines for Simethicone

Simethicone is strictly for oral administration and is taken on an as-needed basis, according to instructions outlined in regulatory labeling. The method of administration is dependent on the specific dosage form and is subject to strict maximum daily limits.

Standard Labeled Dosing Regimen

Population Standard Single Dose Range Maximum Daily Dose (24 Hours)
Adults and Children 12 years 40 mg to 250 mg 500 mg
Children 2 to 12 years 40 mg 480 mg
Infants under 2 years 20 mg 240 mg (12 doses)

All dosages are repeated as needed, typically up to four times daily (QID). The total daily dose must not exceed the specified maximum for the relevant age group except under the advice and supervision of a physician.

Specific Administration Instructions

  • Timing: Doses should be taken after meals and at bedtime.
  • Capsules and Softgels: These forms must be swallowed whole with water. The capsules should not be chewed.
  • Chewable Tablets: These must be chewed thoroughly before swallowing to ensure proper action.
  • Oral Suspensions/Drops: Liquid preparations must be shaken well before use. The dose must be accurately measured using the calibrated dropper or syringe provided with the product, not a common kitchen spoon. For infants, the drops may be mixed with 1 ounce of cool water or infant formula to facilitate administration.

Simethicone is intended for short-term, intermittent use. Patients are generally advised to seek professional guidance if symptoms persist or recur after more than 14 days of use.

Recent Clinical Evidence

The Research Basis for Symptom Relief from Gas and Bloating

Research has examined Simethicone’s use in conditions characterized by fluctuating or episodic manifestations of gas and bloating. This topic has been the subject of numerous studies, including Randomized Controlled Trials (RCTs) and comprehensive Systematic Reviews. The research examined populations including adults and teenagers experiencing acute, non-specific abdominal discomfort.

Studies conducted during periods of increased symptom activity monitored a range of patient-reported outcomes describing perceived discomfort, such as changes in subjective pain severity scores and feelings of abdominal distension or pressure. The research examined short-term symptom changes, with follow-up durations typically being limited to the acute phase. Findings describe patterns observed in the studies regarding how symptoms evolved in the observed populations during the defined study intervals. However, results apply only to the populations studied, and long-term effects are not fully established.

Studies on Simethicone vs. Placebo for General Gas Discomfort

A number of trials were conducted to compare Simethicone against an inactive substance (placebo). These studies used highly specific measurement tools to track subtle shifts in outcomes related to physical discomfort and outcomes related to systemic or functional imbalance. Studies report how symptoms evolved in the observed populations. Findings describe changes measured during the study period, though evidence quality varies across studies due to inconsistencies in the specific tools used to track these subjective measures.

Research on Simethicone as an Aid for Diagnostic Imaging Procedures

Simethicone was studied for a functional role in medical procedures where gas bubbles were observed to interfere with imaging. Observational studies and clinical research explored its application in settings such as abdominal ultrasound and radiography. The outcomes monitored in these research scenarios were related to the technical quality of the visualization, such as the reduction of gas artifact and the enhancement of image clarity. The outcomes monitored in these research scenarios focused on the functional quality of the diagnostic image rather than patient symptoms.

Role of Simethicone in Enhancing Visualization During Endoscopy

Simethicone was evaluated in studies examining its use as an adjunct to standard bowel preparation for procedures like colonoscopy and capsule endoscopy. Research examined temporary physiological imbalance related to bubble formation. Studies monitored specific outcomes such as the grading of the colon lining visualization quality and the quantification of residual bubbles. While studies reported measurements showing patterns of bubble reduction, findings were mixed when evaluating overall bowel cleanliness scores and final metrics like the Adenoma Detection Rate. Data are still emerging for optimal protocols in this specific functional application.

Key Studies & References U.S. National Library of Medicine: Simethicone Drug Information (Symptomatic Relief and Discomfort)

Frequently Asked Questions (FAQ)

Common questions about Симетикон (FAQ)


Q: Через какое время после приема начинает действовать Симетикон? (How soon after taking it does Simethicone start to work?)

A: Simethicone's action is physical and non-systemic, meaning it acts directly on the gas bubbles in the digestive tract. Official information notes that the mechanism involves a rapid physical change (lowering surface tension). The physical action of Simethicone is designed to occur quickly, leading to a noticeable change in gas bubble structure in the digestive tract.


Q: Сколько по времени можно принимать Симетикон? (For how long can Simethicone be taken?)

A: According to official product information, Simethicone is typically intended for short-term, intermittent use for acute symptoms. Patients are generally advised to seek professional guidance if their symptoms persist or recur after more than 14 consecutive days of use.


Q: Есть ли привыкание к Симетикону, если пить его долго? (Is there dependency or tolerance to Simethicone if taken long-term?)

A: Since Simethicone is a chemically inert substance that is not absorbed into the bloodstream, official regulatory information indicates there is no known potential for systemic dependence or tolerance from long-term use. It acts only locally within the gastrointestinal tract.


Q: Какие взаимодействия с другими лекарствами есть у Симетикона? (What interactions does Simethicone have with other medicines?)

A: As an inert and non-absorbed compound, Simethicone has no significant systemic interactions with most medications. The one notable exception is a physical interference that can result in reduced absorption of thyroid hormones (like Levothyroxine/Liothyronine) if they are taken at the same time.


Q: Можно ли пить Симетикон с другими лекарствами одновременно? (Can Simethicone be taken with other medicines at the same time?)

A: For most non-thyroid medicines, Simethicone's inert profile means that no specific timing separation is required for co-administration. However, regulatory documents advise that the dose be separated by several hours when taking thyroid hormones.


Q: Что говорят исследования о длительном приеме Симетикона? (What do studies say about long-term use of Simethicone?)

A: Research studies on Simethicone have typically focused on short-term, acute symptom relief and follow-up durations are usually limited. Therefore, official information indicates that long-term effects are not fully established, and professional guidance is advised for use exceeding the recommended short-term period.


Q: Может ли быть запор от приема Симетикона? (Can Simethicone cause constipation?)

A: Yes, Constipation is listed as a reported adverse reaction in regulatory documents. Its frequency is typically classified as Uncommon, meaning it is not reported as a common side effect in regulatory classifications.


Q: Какие официальные предупреждения есть для пациентов с определенными заболеваниями? (What official warnings exist for patients with certain diseases?)

A: Official labeling documents a formal contraindication (a condition listed in official documents where the drug is not recommended) for patients with a suspected or known gastrointestinal perforation or intestinal obstruction.


Q: Чем отличается Симетикон в каплях от таблеток? (How does Simethicone in drops differ from tablets?)

A: The different formulations are designed to suit specific administration needs and age groups. The oral suspension/drops form is specifically eligible for use in infants and young children, while chewable tablets and capsules are generally intended for older children and adults.


Q: Что делать, если пропустил прием Симетикона? (What should I do if I missed a dose of Simethicone?)

A: Since Simethicone is typically taken as needed for symptoms rather than on a strict schedule, regulatory guidance advises against taking a double or extra dose. Patients are advised to take the next dose when needed for symptom relief, according to the official product instructions.


Q: Можно ли давать Симетикон младенцам или детям? (Can Simethicone be given to infants or children?)

A: Yes, Simethicone is officially eligible for use across all age groups, including the infant population. Specific liquid formulations and corresponding dosage guidelines are eligible for use in children.


Q: Симетикон влияет на печень или почки? (Does Simethicone affect the liver or kidneys?)

A: Due to its non-systemic action, Simethicone is not absorbed into the bloodstream. Regulatory documents state that no specific dose adjustments or restrictions are documented for patients with hepatic (liver) or renal (kidney) impairment, as the substance is not required to be processed by the liver or kidneys for elimination.


Q: В чем разница между Симетиконом и активированным углем? (What is the difference between Simethicone and activated charcoal?)

A: Simethicone is classified as a silicone-based surfactant (antifoaming agent) that physically works by breaking down gas bubbles. Activated charcoal is classified differently and acts by adsorption (binding) substances in the gut. They are distinct compounds with different mechanisms for treating gas.


Q: Нужно ли что-то менять в диете при приеме Симетикона? (Is it necessary to change anything in the diet when taking Simethicone?)

A: Regulatory documents confirm that no specific foods or dietary changes are required when taking Simethicone. The compound is generally inert and regulatory documents confirm no specific warnings regarding interference with food.


Q: Симетикон и алкоголь — можно ли их сочетать? (Simethicone and alcohol — can they be combined?)

A: Official regulatory information indicates that Simethicone is not affected by alcohol. Therefore, no formal warning or restriction is typically listed regarding their co-consumption.


Q: Симетикон — это рецептурный препарат? (Is Simethicone a prescription drug?)

A: Simethicone is legally classified as an Over-the-Counter (OTC) drug in most jurisdictions. This means it can be purchased without a doctor's prescription.


Q: Правда ли, что его можно принимать только по назначению врача? (Is it true that it can only be taken as prescribed by a doctor?)

A: As an Over-the-Counter (OTC) drug, it can typically be purchased and used without a prescription. However, professional guidance should always be sought if symptoms are severe or persist longer than recommended on the label.


Q: Нужна ли консультация врача для начала приема Симетикона? (Is a doctor's consultation needed before starting Simethicone?)

A: While it is an Over-the-Counter product, official advice recommends seeking professional guidance if symptoms are severe, persist or worsen after several days, or if new symptoms (like severe pain) occur.


Q: Есть ли в составе Симетикона лактоза или сахар? (Does Simethicone contain lactose or sugar?)

A: The non-active ingredients, or excipients, vary widely by product and formulation. While some forms may contain sweeteners like dextrose or sorbitol, patients should check the specific product label for a complete list of all excipients.


Q: Может ли Симетикон маскировать симптомы серьезных болезней? (Can Simethicone mask the symptoms of serious illnesses?)

A: Official labeling advises patients to consult a physician if gas symptoms worsen or if new severe symptoms occur (like blood in the stool). This is a general caution to ensure that serious underlying conditions are not masked by the symptomatic relief provided.


Q: Существует ли риск взаимодействия Симетикона с травяными добавками? (Is there a risk of interaction between Simethicone and herbal supplements?)

A: Regulatory documents do not list formal warnings or restrictions regarding co-consumption with herbal or dietary supplements. This aligns with the drug's inert, non-systemic profile.


Q: Почему Симетикон считается «инертным» веществом? (Why is Simethicone considered an 'inert' substance?)

A: Simethicone is classified as inert because it is a synthetic compound that does not chemically react with digestive substances, nor is it absorbed into the bloodstream. It is eliminated from the gastrointestinal tract unchanged.


Q: Может ли Симетикон вызывать головную боль? (Can Simethicone cause a headache?)

A: Regulatory documents listing common and serious adverse reactions do not include headache as a recognized side effect associated with the use of Simethicone.


Q: Помогает ли Симетикон при коликах у взрослых? (Does Simethicone help with colic in adults?)

A: Official regulatory indications for adult use are the symptomatic relief of gas, bloating, and flatulence. The term 'colic' is generally not used in adult labeling, though the drug addresses the excess gas that may contribute to general abdominal discomfort.


Q: Есть ли данные о безопасности Симетикона для пожилых людей? (Is there safety data for Simethicone use in the elderly?)

A: Official eligibility documents confirm that the safety profile is considered acceptable for use in older adults. Due to the lack of systemic absorption, no specific dosage adjustments or restrictions are documented for the elderly population.


Q: С какого возраста Симетикон можно принимать детям? (From what age can children take Simethicone?)

A: Simethicone is officially eligible for use across all age groups, with specific liquid formulations approved for the infant population, which is categorized in official dosing guidelines as under 2 years.


Q: Можно ли принимать Симетикон, если есть проблемы с кишечником? (Can Simethicone be taken if there are intestinal problems?)

A: Simethicone is intended for the symptomatic relief of excess gas in the digestive tract, which can accompany various intestinal issues. However, it is contraindicated if there is a suspected or known gastrointestinal perforation or obstruction.


Q: Чем Симетикон отличается от других средств от газов? (How does Simethicone differ from other anti-gas agents?)

A: Simethicone is classified as a silicone-based surfactant (antifoaming agent) that physically breaks down gas bubbles. This mechanism is distinct from other classes of anti-gas agents, such as those that use adsorption (like activated charcoal) or those that contain enzymes to prevent gas formation from food.

How should Симетикон be stored and disposed of?

How to Store and Dispose of Simethicone

Simethicone must be stored according to official regulatory requirements to ensure product stability and safety.


Storage and Handling

Requirement Specifics Based on Regulatory Labels
Temperature Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F).
Protection Protect from excessive heat and moisture. Liquid forms must not be frozen.
Container Keep in the original container and ensure the cap is tightly closed.
Child Safety Mandatory instruction to keep out of the sight and reach of children.

Disposal Instructions

Unused or expired Simethicone must not be disposed of via wastewater or household waste. The proper procedure is to discard the product in accordance with local regulations or by consulting a pharmacist for guidance on medicine take-back programs.

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

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