Peptac

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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 Peptac

Quick Facts

Property Description
Active Ingredients Sodium alginate, Sodium bicarbonate, Calcium carbonate
Form Oral liquid suspension
Pharmacological Class Reflux suppressant, Antacid
General Purpose Relief from heartburn and acid indigestion
Origin Combination of synthetic and derived (alginate) substances

What Type of Medicine is Peptac?

Peptac is a commercially available alginate-antacid formulation, primarily functioning as a reflux suppressant and antacid. It is an Over-the-Counter (OTC) combination product designed to address the symptoms of acid backflow, specifically heartburn and acid indigestion. Unlike simpler acid-neutralizing agents, Peptac's triple-action formulation is clinically recognized for providing both chemical buffering and a crucial physical barrier mechanism, giving it a distinctive positioning among treatments for gastric distress.

Composition and Form of Peptac

Peptac is a combination product containing three main active ingredients: sodium alginate, sodium bicarbonate, and calcium carbonate. The product is presented as an oral liquid suspension, a physical form that facilitates the rapid deployment of the active components upon ingestion. The primary functional component, sodium alginate, is derived from natural sources, while the bicarbonate and carbonate components are synthetic. This medicine is categorized as acting non-systemically, meaning the ingredients work locally within the stomach without requiring significant absorption into the bloodstream.

General Purpose of the Alginate-Antacid Combination

The general purpose of Peptac is to provide rapid relief from symptoms by establishing a physical barrier while simultaneously reducing the corrosiveness of stomach acid. Pharmacological studies support that the sodium alginate component rapidly forms a protective layer—or "raft"—on the stomach contents, which physically helps to suppress the reflux of acid. Concurrently, the sodium bicarbonate and calcium carbonate provide immediate chemical action, neutralizing excess gastric acid. This effective dual-action approach targets both the acidic nature and the mechanical movement of the gastric contents.

Regulatory References

  1. composition data (PubChem/NIH)
  2. PubChem, NIH

What side effects are possible with Peptac?

Possible Side Effects and Safety Information

This section describes the safety information and adverse reactions officially documented in government regulatory sources for Peptac.

Frequency-Classified Adverse Reactions

The following clinically significant adverse reactions have been classified as Very Rare (affecting less than 1 in 10,000 treated patients):

  • Immune System Disorders: Anaphylactic and anaphylactoid reactions.
  • Hypersensitivity: Reactions such as urticaria (hives), bronchospasm (narrowing of airways), and angioedema (swelling of the face, lips, or throat).

Population-Specific Safety Considerations

The medicine's safety profile includes specific considerations for certain patient groups:

  • Sodium Content: The preparation contains a high amount of sodium per dose (286.5 mg/20 ml), which is a significant proportion of the WHO recommended maximum daily intake. This requires caution for patients advised to follow a sodium-restricted diet.
  • Excipient Risk: The presence of excipients such as ethyl parahydroxybenzoate (E214), propyl parahydroxybenzoate (E216), and butyl parahydroxybenzoate is noted because these can cause allergic reactions, which may occur as a delayed response.
  • Fructose Intolerance: As the product contains liquid maltitol, patients with rare hereditary problems of fructose intolerance should exercise caution.

Safety Restrictions and Limitations

To avoid potential interference with the absorption of other treatments, this medicine should not be taken within two hours of taking other oral medicines, including certain antibiotics, iron preparations, and antifungal agents. This restriction ensures the efficacy of co-administered treatments is maintained.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documentation describes the typical presentation of an acute overdose of the sodium alginate, sodium bicarbonate, and calcium carbonate combination (Peptac) as involving localized gastrointestinal manifestations. The documented clinical signs observed in such instances are abdominal distension (bloating) and general abdominal discomfort. These symptoms are primarily related to the physical presence or volume of the suspension taken.

The officially documented management for an acute overdose situation is confined to the provision of symptomatic treatment. The regulatory profile also confirms that no specific antidote is known for this product combination.

When to Seek Medical Attention

The mandated regulatory action for individuals who have taken an excessively large amount of the medicine is to consult a doctor or pharmacist for guidance.

More severe potential outcomes are officially linked to prolonged, high-dose ingestion. These complications, which are due to excessive mineral and electrolyte intake, include the development of Hypercalcaemia, Alkalosis, and in certain circumstances, Milk-alkali Syndrome. Caution is also officially advised for patients with pre-existing Renal Impairment or Hypercalcaemia, as the components may exacerbate these conditions following an overdose.

Therapeutic Uses of Peptac

Quick Facts: Therapeutic Domains

  • Relief of Symptoms: Intended to provide symptomatic relief from manifestations of acid reflux.
  • Associated Conditions: Used in the management of heartburn and indigestion, including those that may occur during pregnancy.
  • Physical Barrier: Helps to establish a physical barrier that may reduce the occurrence of reflux.

What Peptac Treats: Main Uses and Benefits

Peptac is a therapeutic option used for the management of symptoms linked to gastro-oesophageal reflux. The formulation is intended to provide comfort from discomfort, such as the burning sensation of heartburn and general indigestion. By establishing a physical barrier, this medicine may reduce the frequency and severity of acid regurgitation, where stomach contents travel back up into the food pipe.

Its usage is appropriate for addressing epigastric and retrosternal distress where the underlying cause is gastric reflux. This includes the management of heartburn that is commonly associated with pregnancy and conditions such as hiatus hernia. The product is designed to facilitate a state of well-being by reducing irritating symptoms and is generally used for short-term symptomatic relief. If symptoms are persistent, or if continuous use is required beyond seven days, a healthcare professional should be consulted.

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Peptac — Official Regulatory Information

This section is strictly based on the official population eligibility and contraindication rules documented in governmental regulatory sources, such as the Summary of Product Characteristics (SmPC).


Eligibility Scope

Category Regulatory Status (as stated in label)
Populations for whom use is allowed Adults and adolescents (12 years and over), pregnant women, breastfeeding women, and older adults.
Populations for whom use is not recommended Children younger than 12 years of age (except on medical advice).
Populations for whom use is contraindicated Patients with known hypersensitivity to any ingredient, those with moderate or severe renal insufficiency, and those with hypercalcaemia.

Age-Related Eligibility Rules

  • Adults and Adolescents: Approved for use in individuals 12 years and over.
  • Children under 12 years: Treatment is not generally recommended.
  • Older Adults (Geriatric): No dose modifications are necessary.

Condition-Specific Eligibility Rules

  • Renal Impairment: Contraindicated in moderate or severe insufficiency.
  • Hepatic Impairment: No modifications necessary.

Pregnancy and Lactation Eligibility Status (If Explicitly Documented)

  • Pregnancy: Can be used if clinically needed.
  • Lactation/Breastfeeding: Can be used during breastfeeding.

Eligibility-Related Restrictions

Use requires special precaution for patients on a strictly controlled sodium diet (including those with congestive heart failure) and those with a history of recurrent calcium-containing renal calculi (kidney stones).


Resulting Eligibility Structure

Official eligibility statements:

  • Adults and adolescents 12 years and over are approved for use.
  • The medicine is contraindicated in patients with a known hypersensitivity to any ingredient.
  • Use is contraindicated in patients with moderate or severe renal insufficiency.
  • Use is allowed during both pregnancy and breastfeeding.
  • Caution must be exercised for patients on a strictly controlled sodium diet.

Connection to the overall eligibility profile: The regulatory documents strictly define who can and cannot use Peptac based on absolute contraindications (hypersensitivity, severe renal failure) and explicit age-based limitations (not recommended under 12). Eligibility for specific groups is made conditional due to the sodium and calcium content, which requires caution in patients with sodium-restricted diets or a history of recurrent kidney stones.

What should I know about interactions with other medicines?

Interaction Scope

The official regulatory profile for Peptac is structured around two key interaction patterns: a Pharmacokinetic Absorption Interaction and a Pharmacodynamic Electrolyte Risk.

Category Official Regulatory Documentation Statement
Medicinal product categories with documented interactions The product's antacid components may reduce the absorption of numerous oral medicines, including Antibiotics (Tetracyclines, Fluoroquinolones), Thyroid Hormones, Oral Iron salts, Digoxin, Beta-blockers, Penicillamine, and Lithium (Source: Government Regulatory Documents).
Mechanistic basis of interactions The primary interaction mechanism is pharmacokinetic, resulting in reduced systemic exposure (bioavailability) of co-administered oral medicines due to the antacid-induced change in gastric pH (Source: Government Regulatory Documents).
Timing-based interaction rules A time-interval of two hours (1 to 2 hours) must be observed between the intake of Peptac and the oral administration of other medicinal products to mitigate the documented absorption risk (Source: Government Regulatory Documents).
Population-specific interaction notes The high sodium content of the formulation constitutes an interaction-related restriction for patients on a highly restricted salt diet, such as those with severe cardiac or renal impairment (Source: Government Regulatory Documents). The product should not be used in patients with moderate or severe renal insufficiency.

Resulting Interaction Structure

The official label mandates the 2-hour separation rule to prevent the documented reduction in the absorption of critical medicines, which is classified as a clinically significant pharmacokinetic constraint. Furthermore, the label requires considering the sodium content as a population-specific interaction restriction for individuals whose medical condition is susceptible to increased sodium load.

Mechanism of Action

How Peptac Works

Peptac's action is fundamentally non-systemic, relying on a synergistic physicochemical dual mechanism within the upper gastrointestinal lumen.


Chemical Neutralization of Gastric Acidity

This domain addresses the rapid, local acid buffering performed by the sodium bicarbonate and calcium carbonate components. These components chemically interact with hydrogen ions ( H^+) in the stomach fluid, resulting in a swift, localized increase in pH. This mechanism reduces the concentration of free hydrogen ions ( H^+), resulting in a localized change to the chemical environment of the stomach contents.


Mechanical Barrier Formation (The Alginate Raft)

This mechanism is driven by the physical polymerization (gelation) of sodium alginate. In the stomach's acidic environment, aided by Ca^2+ ions, the alginate forms a highly viscous, cohesive raft. This raft is buoyed by CO2 gas and floats on the stomach contents, acting as a physical barrier that modifies the fluid dynamics and obstructs retrograde movement of the gastric contents.


Synergy and Component Interdependence

The mechanism relies on a synergistic cascade: the calcium carbonate supplies the necessary cross-linking Ca^2+ ions required for the alginate to rapidly form a structurally stable gel, while the CO2 from the sodium bicarbonate provides the necessary buoyancy to ensure the barrier floats efficiently. This interdependence facilitates the rapid formation and structural stability of the physical barrier.

Dosage and Administration Information

Official Administration Guidelines

Peptac is an oral liquid suspension intended for administration by mouth, with its use defined by specific, high-level dosing and timing instructions outlined in product guidelines.

Dosing Schedule and Frequency

The standard regimen for Adults and Children over 12 years is 10 ml to 20 ml (two to four 5 ml spoonfuls) per dose. For Children 6 to 12 years, the dose is 5 ml to 10 ml (one to two 5 ml spoonfuls). The total frequency must not exceed four doses a day. Administration to children under six years of age is generally not recommended, or should be guided by medical advice.

Administration Context

Official instructions specify taking the dose after meals and at bedtime to align usage with periods of high risk for acid backflow. The bottle must be shaken well before use to ensure the dose consistency. If a dose is forgotten, guidelines direct users to take the next scheduled dose as normal, without doubling the dose.

Use Duration and Procedural Constraints

The medicine is designed for short-term symptomatic use. Guidelines mandate that if symptoms do not improve or persist after seven days of continuous use, a healthcare professional must be consulted. Furthermore, due to the potential for the product to interfere with the absorption of other oral medications, a strict procedural constraint requires administering the suspension 1 to 2 hours apart from other drugs taken by mouth.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Peptac


Evidence for Use in Symptomatic Heartburn and Acid Reflux

Research examined the alginate and antacid combination, found in Peptac, in studies focusing on short-term symptoms of heartburn and acid reflux. The research available primarily includes short-term Randomized Controlled Trials (RCTs), a study design relevant in evidence describing how symptoms are measured. Studies focused on populations experiencing symptoms of heartburn and acid reflux, which are conditions characterized by fluctuating or episodic manifestations.

Researchers primarily monitored patient-reported outcomes describing perceived discomfort, such as measurements of the time to symptom change and the duration of the observed effect. Findings describe patterns observed in the studies where the combination was evaluated in research exploring short-term symptom changes. These studies help show what has been observed so far, but research does not determine whether an individual will respond similarly to the group patterns.


Comparative Research Findings


Studies in Special Populations

Research has been studied for the use of this type of formulation in specific patient groups, such as in pregnant women experiencing heartburn. Studies monitored outcomes related to physical discomfort in these specific groups, as part of the research protocol. Evidence is limited for certain subgroups, such as children, meaning the data for certain groups remain insufficient.


Long-Term Outcomes and Follow-Up Data


Key Uncertainties and Research Gaps

The majority of the available research was studied for short-term relief. The follow-up durations were limited in many of the trials. Therefore, long-term effects are not fully established regarding continuous daily use over periods of months or years. Certainty remains low regarding the durability of effects after stopping use. Additionally, comparative evidence is limited in some areas. The findings describe group patterns, but they do not provide a complete picture, meaning research is ongoing to address these gaps.

Key Studies & References

  1. Gastro-oesophageal reflux disease and dyspepsia in adults: investigation and management (NICE Guideline CG184)

Frequently Asked Questions (FAQ)

Common questions about Peptac (FAQ)

Q: How quickly is Peptac expected to start working?

Official documents describe this medicine as acting rapidly due to its specific combination of ingredients. This fast action is related to its unique dual mechanism, which includes both acid neutralization and the quick formation of a physical barrier in the stomach.


Q: How long does the effect of one dose of Peptac typically last?

The duration of the observed effect has been examined in clinical studies focusing on short-term symptom relief. Studies have examined the duration of the effect, which has been observed to last up to approximately four hours in that research.


Q: Does Peptac come in different flavors?

The most common form of this medicine that is listed in regulatory documents is described as Peppermint Liquid. The flavor is generally included in the product name on the labeling.


Q: Are there different strengths of Peptac?

According to the official product composition documents, this liquid product is described in a single concentration of its active ingredients. Different strengths of the liquid formulation are not listed in the regulatory profile.


Q: What is the purpose of the liquid form of Peptac?

The formulation as an oral liquid suspension is intentional. The liquid form facilitates the rapid deployment of the active ingredients, which aids in the effectiveness of the medicine’s physical action. This helps ensure the physical barrier forms quickly inside the stomach.


Q: Does Peptac cause drowsiness or make you tired?

Drowsiness, fatigue, or other effects on the central nervous system (like feeling tired) are not listed among the adverse reactions officially documented for this medicine in regulatory sources.


Q: Can taking Peptac change the color of stools?

Changes to the color of stools are not included in the officially documented list of adverse reactions for Peptac. Official safety information focuses primarily on hypersensitivity reactions.


Q: Is a metallic taste common after using Peptac?

Taste disturbance or a metallic taste is not listed in the official regulatory documentation of adverse reactions for this product.


Q: Are there any known issues with taking Peptac and certain vitamins?

The primary interaction issue is pharmacokinetic, meaning the medicine can change the chemical environment in the stomach and potentially reduce the absorption of other oral products. Official guidelines direct users to observe a separation of two hours from the intake of all oral medicines and supplements, including vitamins, to mitigate this risk.


Q: Is it okay to take Peptac if I am taking blood pressure medicine?

Regulatory documents specifically mention that Peptac may reduce the absorption of certain oral medicines, including drugs like beta-blockers that are used for blood pressure. Regulatory documentation specifies that a two-hour separation is required between the two medicines due to the absorption risk.


Q: Does Peptac have gluten or common allergens in it?

The official list of ingredients and excipients does not include gluten or lactose. However, official warnings note the presence of ingredients like parahydroxybenzoates and liquid maltitol, which can cause allergic or other specific reactions in sensitive individuals.


Q: Is Peptac different from alginate-only products?

Yes, Peptac is officially described as a combination product. It contains sodium alginate for the physical barrier, but also the antacids sodium bicarbonate and calcium carbonate, which provide a chemical acid-neutralizing action.


Q: Does Peptac interact with common pain relievers like paracetamol?

Regulatory information notes a procedural constraint to observe a separation of two hours between Peptac and all other oral medicines, including common pain relievers. This is intended to mitigate the risk of reduced absorption and maintain the effectiveness of the other medicine.


Q: Is it possible to become dependent on Peptac if used often?

Official warnings emphasize that this medicine is for short-term use. Regulatory documents specify a time limit for use, stating that if symptoms persist for more than seven days, the user should refer to a healthcare professional. There are no documented reports of tolerance or dependence listed in the regulatory profile for this medicine.


Q: Does Peptac contain sugar or artificial sweeteners?

The product is noted to contain liquid maltitol, which is a type of sugar alcohol and sweetener. Official warnings note that special caution is required for individuals with rare hereditary problems of fructose intolerance.


Q: What does the term 'alginate' mean in simple language?

Alginate is a key active component in the medicine that is derived from natural sources, often associated with seaweed. Its role is to form a physical protective layer or "raft" that floats on the stomach contents.


Q: Can Peptac be used for a persistent cough caused by reflux?

The medicine is officially indicated for the relief of symptoms of gastro-oesophageal reflux such as heartburn and acid indigestion. Its approved use is limited to these specific symptoms.


Q: Is Peptac known to cause or worsen constipation?

Constipation is not listed in the official regulatory documentation of adverse reactions for Peptac. Official safety information focuses on hypersensitivity reactions, which are categorized as Very Rare.


Q: Is it normal to feel a bloated feeling after taking Peptac?

The medicine's mechanism involves the generation of carbon dioxide ( CO2) gas inside the stomach, which facilitates the physical barrier (the raft) floating on the stomach contents. Some users may notice a sensation or discomfort related to this expected gas generation.


Q: What are the most commonly reported mild side effects of Peptac?

The officially documented list of adverse reactions includes hypersensitivity reactions which are classified as Very Rare (affecting less than 1 in 10,000 people). No other common or mild side effects are officially categorized by frequency in the regulatory documents.


Q: Is it normal to need to drink water after taking the liquid Peptac?

The official administration guidelines provided in regulatory documents do not include an instruction to drink water immediately after taking the liquid suspension.


Q: Is Peptac suitable for people with diabetes?

The medicine contains liquid maltitol, which is a sweetener. Regulatory documents also provide warnings about the high sodium content in each dose. These facts are noted in relation to dietary management for people with diabetes or other related conditions.


Q: Does using Peptac affect the absorption of food nutrients?

The documented risk of absorption interference is specific to co-administered oral medicines (such as iron salts or certain antibiotics). The official interaction warnings do not specify an effect on the general absorption of food nutrients.


Q: What kind of regulatory body approved Peptac for sale?

Products like this are approved for sale by the relevant governmental medicine regulatory authority in the country where they are distributed. These agencies are responsible for assessing the product's safety and efficacy before market authorization.


Q: Are there different packaging sizes of Peptac available?

The official regulatory documentation lists that the medicine is supplied in various bottle sizes. Common packaging sizes often include 100 ml, 250 ml, and 500 ml containers.


Q: How is Peptac different from a medicine that reduces acid production?

Peptac is officially categorized as a reflux suppressant and antacid. This means its primary function is to physically block acid backflow and chemically neutralize existing acid, rather than suppressing the overall production of stomach acid like certain other medicines do.


Q: Can Peptac be used alongside proton pump inhibitors?

The official regulatory instruction is to observe a two-hour time interval between the intake of Peptac and other oral medicines. This constraint is outlined to mitigate potential absorption risks associated with all orally taken medicines.

How should Peptac be stored and disposed of?

How to Store and Dispose of Peptac

The storage and disposal requirements for Peptac Peppermint Liquid are strictly defined by regulatory labeling to maintain the product's stability and efficacy.

Storage Conditions

Requirement Official Instruction
Temperature Limit Do not store above 25 C
Prohibited Environments Do not refrigerate or freeze
Child Safety Keep out of the sight and reach of children

Stability and Disposal

Once the bottle is opened, the medicine must be used within four weeks. After this period, or if the product has expired, it must be disposed of correctly. Unused or expired Peptac should be returned to any pharmacy for appropriate disposal. This prevents the medicinal product from entering the environment through household waste or wastewater.

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

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