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Маалокс

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Маалокс

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Method of action: Antacid

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.

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Overview of Маалокс

Quick Facts

Property Description
Active ingredients Algeldrate, Magnesium Hydroxide
Forms Oral suspension, Chewable tablets
Pharmacological class Antacid
General purpose Neutralizes excess stomach acid
Origin Synthetic inorganic compounds

What Type of Medicine is Маалокс?

Маалокс is defined as a fixed-dose combination product belonging to the high-level pharmacological category of Antacids, intended for the effective neutralization of excess acid in the stomach. Antacids are a class of medication used for providing relief from heartburn, indigestion, and sour stomach. This preparation is utilized in clinical settings for its balanced approach to rapid pH correction. Маалокс is chemically composed of synthetic inorganic compounds derived from mineral salts, which function as chemical bases to locally counteract acidity within the gastrointestinal tract, supporting its common over-the-counter (OTC) status for adult self-care.

Composition and Available Forms of Маалокс

The formulation contains two INN active ingredients: Algeldrate (a form of dried aluminium hydroxide gel) and Magnesium Hydroxide. This dual composition defines it as a polyvalent antacid, utilizing the distinct properties of aluminium and magnesium salts in a deliberately balanced mixture. Combining these salts serves to optimize therapeutic action and minimize undesirable gastrointestinal effects commonly associated with single-salt antacids, resulting in a more balanced therapeutic profile. Маалокс is administered via the oral route and is commonly supplied as a liquid oral suspension and as convenient chewable tablets, offering versatility in patient administration and positioning it as a fast-acting, portable option.

Primary Action and General Purpose

The general purpose of this medicine is to provide prompt relief by means of gastric acid neutralization, directly addressing the discomfort caused by excess stomach acid. The active hydroxides chemically react with the hydrochloric acid (HCl) present in the stomach, effectively consuming the acid and elevating the gastric pH. This immediate local action helps to alleviate the symptomatic manifestations of gastric hyperacidity, including the characteristic burning sensation known as heartburn and general dyspepsia, which is commonly described as an upset or sour stomach following a meal.

Regulatory References

  1. MedlinePlus Medical Encyclopedia: Taking Antacids
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What side effects are possible with Маалокс?

Possible Side Effects and Safety Information

The official safety information for this combination antacid (Algeldrate and Magnesium Hydroxide) addresses adverse reactions primarily affecting the digestive system and mineral balance, categorized by frequency as defined in regulatory documents.

Classification Adverse Reaction Categories
Uncommon Diarrhea, Constipation
Not Known Hypersensitivity reactions (e.g., pruritus, urticaria, angioedema), Hypermagnesemia, Hypophosphatemia

Constipation is generally linked to the aluminum component (Algeldrate), while diarrhea is associated with the magnesium component, which is why both are listed as uncommon due to the formula's balancing effect. Other documented effects involve the Metabolism and Nutrition Disorders system, including the potential for high levels of magnesium (hypermagnesemia) or low levels of phosphate (hypophosphatemia).

Serious Adverse Reactions and Population-Specific Constraints

The most critical safety limitations involve systemic mineral accumulation. Use of this medicine is restricted in patients with severe renal impairment/kidney failure due to the significantly elevated risk of hypermagnesemia and aluminum accumulation (hyperaluminemia), which may lead to neurotoxicity. This risk is a central constraint in regulatory documents.

Furthermore, the label documents that long-term use or high doses are associated with the risk of developing hypophosphatemia and bone demineralization (osteomalacia). Older adults also carry an increased risk of aggravated constipation. These official safety notes structure the understanding of the medicine's risk profile, emphasizing renal function and duration of exposure.

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Overdose and Emergency Response

The official regulatory documents state that acute overdosage of the aluminum and magnesium combination may initially present with common gastrointestinal disturbances, including severe diarrhoea, abdominal pain, and vomiting. However, the regulatory focus for serious outcomes is placed on the accumulation of the active ions. High-dose exposure or prolonged use can result in the serious electrolyte imbalances of Hypermagnesemia and Hyperaluminemia. Severe Hypermagnesemia is a life-threatening outcome documented to manifest through systemic signs such as drowsiness, muscle weakness, cardiac arrhythmias (e.g., heart block), and potentially Respiratory depression or Coma. Seek immediate emergency medical attention if any severe systemic symptoms are observed, as specific interventions are officially required for management. For instance, Intravenous Calcium Gluconate is described for reversing severe cardiac effects of magnesium, and supportive measures like Haemodialysis are documented as necessary steps. The risk of these severe, life-threatening outcomes is explicitly noted to be significantly elevated in patients with pre-existing renal impairment, for whom accumulation is more rapid.

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Therapeutic Uses of Маалокс

What Маалокс Treats: Main Uses and Benefits

Маалокс is a medication used to provide symptomatic management for conditions associated with excess stomach acid. The primary benefit for patients is the ability to achieve temporary relief from uncomfortable digestive symptoms. This relief may help in managing the day-to-day discomfort caused by conditions such as heartburn, acid regurgitation, and indigestion (dyspepsia) that may follow dietary indiscretion or functional digestive issues.

The medication may also be used as a short-term intervention to help manage the symptoms related to certain gastrointestinal conditions, including the pain and discomfort associated with peptic ulcers and gastritis. The goal of treatment is to alleviate discomfort and support the patient's general well-being during symptom flares.

Quick Fact: Relief for Heartburn and Indigestion

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Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Маалокс

This section outlines the officially documented population eligibility and restrictions for using Маалокс (Aluminum Hydroxide/Magnesium Hydroxide), based strictly on governmental regulatory labeling.


Populations for Whom Use is Restricted or Contraindicated

Category Regulatory Status
Absolute Contraindication Contraindicated in patients with severe renal insufficiency or kidney failure, hypophosphataemia (low phosphate levels), and hypersensitivity to the active ingredients. Use is also contraindicated in patients with severe abdominal pain or the possibility of bowel obstruction, and those who are severely debilitated.
Age-Related Restrictions Use is not recommended or contraindicated for the paediatric population (children and adolescents under 12 to 18 years, depending on the specific label). The standard approved population is adults (including the elderly).
Conditional Use Patients with mild to moderate renal impairment must use the medicine with extreme caution and should avoid prolonged use. Caution is also advised for elderly persons due to the increased risk of intestinal obstruction. Diabetics should note the sugar content in certain formulations.
Pregnancy and Lactation Use during pregnancy should be restricted to situations where the potential benefit outweighs the risk, and some labels advise avoiding the first trimester. Use is generally considered compatible with breastfeeding due to negligible maternal absorption.
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What should I know about interactions with other medicines?

The interaction profile for Маалокс is fundamentally defined by its effect on the absorption of co-administered oral medicines. The active components, Algeldrate and Magnesium Hydroxide, cause a reduction in the plasma concentration and overall systemic exposure of a broad range of other medicinal products.

This pharmacokinetic interference, stemming from chelation and local pH elevation, dictates a mandatory rule for administration timing. To mitigate this effect, official regulatory documents require that co-administration must be separated by an interval of at least two to three hours for most interacting medications. A longer separation of four hours is required for Fluoroquinolones.

Documented Exposure Alterations

  • Reduced Exposure: The systemic exposure of products including Tetracyclines, Digoxin, L-Thyroxine, and Iron Supplements may be reduced due to decreased absorption.
  • Increased Exposure: Increased plasma concentration has been documented for Quinine, and Salicylates show increased renal excretion due to urine alkalinisation.
  • Interaction-Related Restrictions: Combinations with Integrase Inhibitors ( Dolutegravir, Raltegravir, Bictegravir) and Pazopanib are officially advised to be avoided. Co-administration with Citrate-containing products increases the systemic absorption of aluminium, which is a documented risk for patients with impaired renal function.
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Mechanism of Action

The active components of Maalox exhibit local action centered within the gastrointestinal tract, functioning to neutralize acid and modulate associated pH-dependent physiological responses.

Gastric Acid Neutralization

This domain covers the direct chemical interaction of the drug's components, aluminum and magnesium hydroxides, with hydrochloric acid ( HCl) in the stomach lumen. The hydroxides act as bases, rapidly initiating a mechanistic cascade of acid-base reactions that elevate the pH within the stomach. This chemical event results in the reduction of free H^+ ion concentration, which contributes to the modulation of gastric pH-dependent physiological responses.

Modulation of Luminal Environment

This domain involves the downstream effects of the non-absorbed reaction products—aluminum and magnesium salts—on the gastric and intestinal lumen. The presence of these salts affects systems where specific mediators like pepsin exhibit pH-dependent activity, causing a resulting reduction in pepsin's proteolytic function. Additionally, the aluminum and magnesium compounds alter gastrointestinal motility, leading to predictable changes in transit time.

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Dosage and Administration Information

How to Use Maalox — Administration Guidelines

The usage protocol for Maalox (Aluminum Hydroxide/Magnesium Hydroxide) positions it as an oral, intermittent treatment for acute symptoms. Administration is focused on precise timing relative to meals, adhering to limits on both frequency and duration.


Administration Scope

Usage Entity Instructions
Route of Administration Oral for both liquid and solid forms.
Labeled Dosing Regimens (Adults ge 12 years) Oral Suspension: 10 mL to 20 mL per dose. Chewable Tablets: One to two tablets per dose.
Frequency and Schedule Taken up to four times a day (QID) or as needed.
Timing in Relation to Meals Doses are typically administered 20 minutes to one hour after meals and at bedtime.
Preparation Requirements Suspension must be shaken well before use. Tablets require thorough chewing before swallowing.
Course Duration Use is constrained to short-term treatment; the maximum dosage should not be used continuously for more than two weeks.
Age-Group Rules Generally not recommended for children under 12 or 14 years unless directed by a clinician.

Connection to the Overall Use Protocol

The instructions establish a self-limited, intermittent use protocol for Maalox, which dictates the maximum daily quantity and imposes a two-week duration limit for continuous use. This protocol emphasizes administration after meals to align with peak periods of potential gastric acid production. The specific preparation steps, such as shaking the suspension, are steps used to ensure the correct amount of active ingredients is delivered in the oral dose.

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Recent Clinical Evidence

Research evidence / Overview of studies for Маалокс

Evidence for Rapid Relief of Heartburn Symptoms

Researchers have explored the use of the antacid combination in short-term Randomized Controlled Trials (RCTs) and controlled comparative studies. These studies were used in research exploring how outcomes related to physical discomfort change over time. The key axes measured were the time from ingestion until researchers observed changes in patient-reported heartburn intensity, and the duration for which patient-reported outcomes describing perceived discomfort were monitored.

Studies reported patterns observed in these short-term trials. Research explored changes measured during the study period, with findings describing a rapid observation of perceived symptomatic change. The evidence contributes to understanding symptom patterns, particularly focusing on acute symptom episodes. However, research exploring sustained benefits for conditions characterized by fluctuating or episodic manifestations is limited.


Studies on Acid Indigestion and Dyspepsia

Systematic reviews and controlled studies have assessed the temporary symptom changes associated with functional dyspepsia and general acid indigestion. Studies monitored patient-reported outcomes describing perceived discomfort. Studies monitored outcomes and described changes in overall dyspepsia symptoms measured during the study period. Systematic reviews of the antacid class described that the evidence quality varies across studies, with some evidence contributing to the broader evidence landscape but certainty remains low for chronic management.


Long-Term Studies and Follow-up

Research exploring short-term symptom changes is common, but long-term effects are not fully established for this combination. Follow-up durations were limited in the majority of available studies, meaning the results apply only to the populations studied over those short periods. There is limited information for long-term outcomes describing symptomatic change or patterns of symptom evolution in observed populations beyond a few weeks.


Gaps in Research and Areas of Uncertainty

Research highlights that studies focusing on episodes where symptoms become more noticeable often have limited follow-up durations. The evidence quality varies across studies, and findings help contextualize how patients reported their experience during short-term symptom activity, but do not determine whether an individual will respond similarly over an extended period. The scientific literature indicates that comparative evidence against modern acid-reducing therapies in a long-term context remains limited in the research.

Key Studies & References HEALTH PRODUCTS REGULATORY AUTHORITY PUBLIC ASSESSMENT REPORT FOR A MEDICINAL PRODUCT FOR HUMAN USE Scientific discussion Maalox

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Frequently Asked Questions (FAQ)

Common questions about Маалокс (FAQ)

Q: Does Маалокс help with heartburn that keeps coming back?

A: Studies examining this medicine's use primarily focus on providing rapid, temporary relief for acute episodes of heartburn. Official research evidence is limited regarding sustained benefits for symptoms that are chronic, frequent, or keep coming back over a long period. Research findings indicate that official evidence for sustained benefit is limited for chronic or frequently recurring symptoms.

Q: How quickly can I expect Маалокс to start working?

A: Studies that monitored patient experiences noted a rapid observation of perceived symptomatic change shortly after the medicine was taken. This medicine belongs to a class of medications designed for quick, local action to neutralize stomach acid shortly after ingestion, aiming for prompt relief.

Q: What does 'neutralizing stomach acid' mean in simple terms?

A: Neutralizing stomach acid means that the medicine's active ingredients, which are chemical bases, directly react with the acid in the stomach. This chemical process consumes the acid and raises the stomach's pH level. The local action provides prompt relief from the symptoms caused by excess acidity.

Q: How long does the effect of a dose of Маалокс usually last?

A: The effects are local to the stomach and are temporary, as the medicine is intended for short-term, intermittent use against acute symptoms. Research explores symptom changes over a limited period after ingestion, which is consistent with its function as a fast-acting antacid for rapid, acute relief.

Q: What is the official information regarding Маалокс and antibiotic use?

A: Official documents specify interactions with certain types of antibiotics, such as Tetracyclines and Fluoroquinolones. This medicine may reduce the absorption of these co-administered drugs. Official guidelines indicate that co-administration separation by an interval of at least two to three hours is required to mitigate this effect.

Q: Does Маалокс contain aluminum, and is that a concern?

A: Yes, the formulation contains Algeldrate, which is a form of aluminum hydroxide. Official warnings emphasize that this ingredient presents a risk of aluminum accumulation in patients with severe kidney impairment. Long-term use or high doses are also associated with a documented risk of developing low phosphate levels (hypophosphatemia).

Q: What types of abdominal discomfort is Маалокс NOT intended for?

A: The primary purpose of this medicine is to address symptoms caused by excess stomach acid, like heartburn and sour stomach. The official patient information explicitly lists severe abdominal pain and the possibility of bowel obstruction as conditions where the use of this medicine is absolutely contraindicated.

Q: What does 'contraindication' mean when official sources talk about Маалокс?

A: In official patient information, a contraindication is a specific condition or factor that renders the use of a medical treatment improper because it may cause harm. For this medicine, examples of contraindications include severe kidney failure and pre-existing low phosphate levels (hypophosphataemia).

Q: Is it true that Маалокс can interfere with the absorption of vitamins?

A: Official data confirms that this medicine can interfere with the absorption of certain co-administered substances, leading to reduced systemic exposure. Specifically, Iron Supplements are documented as having reduced absorption when taken too close to the medicine.

Q: Why is magnesium sometimes included in antacid products like Маалокс?

A: Magnesium hydroxide is a key active ingredient that contributes to acid neutralization. Its inclusion is also designed to balance the potential gastrointestinal side effects. The magnesium component is known to counteract the tendency toward constipation sometimes observed with the aluminum component.

Q: Why do some people use Маалокс before eating certain foods?

A: Official guidance describes the administration protocol as being taken 20 minutes to one hour after meals and at bedtime. This timing is intended to coincide with the period when gastric acid production typically peaks after eating. The labeled instructions describe this timing as aligning with appropriate use.

Q: Does Маалокс interact with common pain relievers like ibuprofen?

A: Official clinical studies have explored the effect of this antacid combination when taken with ibuprofen. Findings from these bioavailability studies indicated that this medicine did not interfere with the absorption of ibuprofen when the two were co-administered.

Q: Why is research evidence for Маалокс important?

A: The research evidence, which includes Randomized Controlled Trials, forms the foundational basis for the official patient information. Regulatory bodies use this evidence to determine the medicine's approved uses, establish necessary warnings, and define the conditions and limitations of its use.

Q: What does the official patient information say about stopping Маалокс use?

A: The official patient information specifies that this medicine is for short-term treatment, constrained to continuous use for not more than two weeks. The patient information describes seeking further guidance if symptoms do not resolve or persist beyond the specified two-week limit.

Q: Are there any specific lifestyle factors mentioned that might affect Маалокс use?

A: Official labeling highlights a specific interaction related to diet involving citrate-containing products, which can be found in some foods and drinks. Co-administration can increase the systemic absorption of aluminum, posing a documented risk for individuals with pre-existing impaired kidney function.

Q: What is the difference between an antacid and a PPI drug?

A: Antacids like this medicine work quickly by directly neutralizing the existing acid in the stomach, providing immediate, local relief. Other medications, such as Proton Pump Inhibitors ( PPIs), have a different mechanism and work systemically to reduce the amount of acid the stomach produces over time.

Q: Can Маалокс be used for symptoms related to a hiatus hernia?

A: The official drug information documents that the combination of aluminum and magnesium hydroxides may be used to relieve symptoms like acid indigestion and heartburn. These symptoms are commonly experienced by patients with conditions such as a hiatal hernia.

Q: Are there specific food or drinks to avoid while taking Маалокс?

A: Official documents describe a necessity for caution regarding the consumption of citrate-containing products, which includes some foods and drinks. For patients with kidney issues, co-administering these products can lead to increased systemic absorption of aluminum, which is a documented safety concern.

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How should Маалокс be stored and disposed of?

Official Storage and Disposal Instructions for Maalox

Storage Conditions and Protection

Maalox must be stored at Controlled Room Temperature, typically 20^circ to 25 C (68^circ to 77 F). It is essential that the oral suspension be protected from freezing. Chewable tablets must be stored in the original package to protect them from moisture.

Container and Stability

Keep the container tightly closed. The suspension must be shaken well before using. The product must not be used after its expiration date. If labeled, the suspension must be discarded six months after the bottle is first opened.

Safety and Disposal

The medicine must be kept out of the sight and reach of children. Unused or expired Maalox should not be disposed of via wastewater or household trash. Patients are directed to ask a pharmacist or use an official drug take-back program for proper disposal.

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

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