Gast Reg

Quick links to important sections

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 Gast Reg

Quick Facts

Property Description
Active ingredient Trimebutine maleate (a synthetic compound)
Form Oral solid dosage form (e.g., tablets)
Pharmacological class Gastrointestinal Motility Regulator, Spasmolytic Agent
General Purpose Balancing irregular bowel movements and sensations
Origin Synthetic

Defining Gast Reg: Composition and Origin

Gast Reg is a medication whose identity is centered on the active ingredient Trimebutine, typically presented in its stable salt form, Trimebutine maleate. This compound is a synthetic molecule, manufactured chemically rather than derived from a natural source, and it functions as a single-ingredient product. It is usually formulated for oral administration as an oral solid dosage form, such as tablets.

The Trimebutine component is clinically recognized for its function as a spasmolytic agent (muscle relaxant) in the gastrointestinal tract. This confirms that the drug helps relax the painful spasms that occur in the digestive muscles.


Pharmacological Type and General Purpose

Trimebutine is classified as a gastrointestinal motility regulator, which means its primary role is to stabilize the mechanical contractions (motility) of the digestive system. This pharmacological designation reflects Trimebutine's unique multimodal or dual action on the bowel.

Trimebutine acts as an agonist on peripheral opioid receptors in the enteric nervous system, helping to regulate gut motility and visceral hypersensitivity. The general purpose of this medicine is to normalize the patterns of movement and sensation within the lower gastrointestinal tract, restoring coordinated function and stabilizing irregular muscular activity. This action is typically used when managing conditions characterized by erratic bowel function.

What side effects are possible with Gast Reg?

Possible Side Effects and Safety Information

The safety profile for Gast Reg (trimebutine maleate) is characterized by a range of documented adverse reactions, classified by frequency and system involvement as defined in regulatory documents. These classifications establish a neutral framework for communicating potential risks.


Adverse Reaction Classification

Side effects are primarily categorized under Gastrointestinal Disorders and Nervous System Disorders.

Classification Common Examples (Regulatory Documents)
Common Dry mouth, diarrhea, constipation, nausea, dizziness, drowsiness, and headache.
Uncommon Rash, pre-syncope, and syncope.
Frequency Not Known Severe skin reactions, including Acute Generalized Exanthematous Pustulosis (AGEP) and Erythema Multiforme, hypersensitivity reactions (including anaphylactic shock), anxiety, and urine retention.

Serious Adverse Reactions and Safety Constraints

Official labeling highlights severe, though rare, hypersensitivity and dermatological events as serious adverse reactions. Overdose cases have specifically been associated with cardiac and neurological disorders, such as QTc interval prolongation, convulsions, and coma.

Regulatory documents outline specific safety considerations for patient groups. The oral tablet formulation is not recommended for use in children under 12 years of age. Use is not recommended during pregnancy, particularly in the first trimester. Due to the potential for effects such as drowsiness, the medicine may impair the ability to drive or operate machinery.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Gast Reg (Trimebutine maleate) overdose is defined by the risk of severe clinical manifestations involving the central nervous and cardiovascular systems.

Documented Overdose Presentations

Overdose may present with serious neurological disorders, including drowsiness, convulsions, and coma. Concurrent cardiac disorders have also been documented, such as bradycardia (slow heart rate), tachycardia (fast heart rate), and prolongation of the QTc interval (a specific electrical change). These documented manifestations indicate the potential for severe and life-threatening outcomes.

Emergency Actions and Monitoring

If an overdose is suspected, official guidance mandates that you contact your regional poison control centre immediately. Immediate medical help is required when severe manifestations, particularly coma or serious cardiac disorders, are observed.

A specialised monitoring environment is required for observation due to the seriousness of the documented effects. Management includes the implementation of symptomatic treatment, and for overdoses involving oral administration, gastric lavage is recommended. No specific antidote is officially documented in the reviewed regulatory labeling.

Therapeutic Uses of Gast Reg

Main Uses and Benefits of Gast Reg

Gast Reg (trimebutine maleate) is generally used in areas where short-term symptom management of functional gastrointestinal disorders is appropriate, and is considered relevant in areas where additional symptomatic support is needed.

The medication is considered relevant for key therapeutic areas and plays a role in managing symptom clusters.

The medication is commonly used to help with symptoms related to heightened physiological activity, such as painful cramping and spasms. It also supports the patient during difficult episodes by easing the overall symptom burden for conditions involving episodic or fluctuating manifestations like diarrhea or constipation that accompany Irritable Bowel Syndrome (IBS). It is applied in clinical settings for conditions such as IBS and for supportive recovery following postoperative paralytic ileus.

“It is commonly used to help with symptoms related to physical discomfort and functional stability.”


Quick Fact: Relief for Functional Discomfort

Symptom Domain Patient Benefit
Intestinal Spasms and Pain Contributes to improved comfort during symptomatic periods
Erratic Bowel Habits Assists with maintaining functional stability of the bowel
Post-Surgical Motility Supports patient recovery by aiding intestinal transit

Regulatory References

  1. Lower gastrointestinal tract motility regulator

Eligibility and Restrictions for Use

Who Can and Cannot Use Gast Reg?

Eligibility for Gast Reg (Trimebutine maleate) is defined by official regulatory documents, which establish clear restrictions based on age, physiological status, and underlying conditions.

Contraindications and Restrictions

The medicine is contraindicated and must not be used in specific groups. These include patients with a documented hypersensitivity or allergy to trimebutine maleate or any of the product's excipients. Furthermore, use is contraindicated in children under 2 years of age.

Age and Physiological Status

Gast Reg is primarily indicated for adults. Its use is not recommended in children under 12 years of age. Use during pregnancy is generally not recommended, particularly in the first trimester, due to insufficient data. Similarly, use while breastfeeding is preferable to avoid, as the passage of the active ingredient into breast milk is not known, and safety has not been established.

Condition-Based Exclusions

Patients with certain rare, pre-existing metabolic conditions, such as galactose intolerance, total lactase deficiency, or glucose-galactose malabsorption, must not use the medicine if the specific formulation contains lactose as an excipient.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes the officially documented interaction patterns for Gast Reg (Trimebutine maleate) based strictly on authoritative government regulatory sources.

Interaction scope

Category Description
Medicinal product categories with documented interactions Neuromuscular blockers; Central Nervous System (CNS) depressants (e.g., Alcohol, Cannabis).
Specific interacting medicines (if explicitly listed) d-Tubocurarine, Pramlintide (listed in health advisories as a product that may interact).
Mechanistic basis of interactions (only if stated in label) Pharmacodynamic interaction (additive effects): prolongation of anesthesia/curarization; enhancement of CNS effects. No specific pharmacokinetic (CYP enzyme or transporter) mechanism is documented.
Timing-based interaction rules (if applicable) None documented. Official government regulatory labels do not specify mandatory time-separation requirements for administration.

Interaction classifications (high-level)

Category Description
Interaction severity classification Official prescribing information reports no specific drug-drug combinations are formally classified as contraindicated. Interactions are described as resulting in an increase in the duration of effect or worsening of side effects.

Resulting interaction structure

Official interaction statements:

  • No specific drug-drug combinations are officially designated as contraindicated in the available government regulatory labeling.
  • Co-administration with d-tubocurarine is documented to increase the duration of curarization.
  • The regulatory profile reports no documented metabolic interactions (e.g., CYP enzyme inhibition or induction) or transporter-mediated interactions.
  • Substances with CNS depressant properties, such as Alcohol and Cannabis, may lead to enhanced CNS effects like dizziness or drowsiness.

Connection to the overall interaction profile (2–4 sentences):

The official regulatory documents define the product's interaction structure as having limited clinically significant drug-drug interactions, with no formal contraindications listed. The documented constraints focus primarily on pharmacodynamic interactions, specifically the described effect on d-tubocurarine during anesthesia and the potential for additive CNS depression with substances like alcohol or cannabis.

Mechanism of Action

How Gast Reg Works


The action of Gast Reg (Trimebutine maleate) is characterized by a dual regulatory mechanism that influences neural control and muscle function, resulting in the modulation of dysregulated activity.

Peripheral Opioid Receptor Modulation and Neuro-Stabilization

The mechanism initiates in the gut's intrinsic nervous system, the Enteric Nervous System ( ENS), where the drug acts as a non-selective agonist on peripheral mu (mu), kappa (kappa), and delta (delta) opioid receptors. This targeted interaction modulates the release of key neurotransmitters that govern gut movement. This domain acts to stabilize the neuro-signaling pathway, contributing to the modulation of intestinal nerve activity rhythm.

Dual Action on Smooth Muscle Tone

The drug directly influences the muscle layer via a concentration-dependent modulation of voltage-gated ion channels, including Calcium ( Ca^2+) and Potassium ( K^+) channels. This ion channel activity provides the dual regulatory effect: it inhibits excessive contractions (spasmolytic action) when the muscle is overactive, while concurrently stimulating contractions (prokinetic action) when the muscle tone is sluggish. This corrective mechanism influences muscle function and contributes to the modulation of gastrointestinal transit time.

Dosage and Administration Information

How Gast Reg Is Used: Administration Guidelines

Gast Reg (trimebutine maleate) is used according to specific administration rules that define its proper intake, frequency, and relationship to mealtimes.


Administration Scope

Administration Component Guideline
Route of Administration Primarily oral administration using tablet forms. Intravenous and Intramuscular routes are reserved for specific circumstances or hospital settings.
Standard Adult Dosing Typical unit doses range from 100 mg to 200 mg. The maximum recommended daily intake is 600 mg in divided doses.
Frequency and Timing The standard schedule is three times daily (TID). Tablets must be administered before meals (pre-prandial).
Pediatric Use Generally not recommended for children under 12 years of age, and contraindicated in those under two years.

Procedural Administration Rules

Use of Gast Reg follows a defined protocol for maintaining consistent levels. If a scheduled dose is missed, it should be taken as soon as possible, unless it is nearly time for the next dose; doubling the dose is prohibited. This medicine is used as a course of treatment for symptom management, and continuation should be directed by the prescribing provider.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Gast Reg (Trimebutine Maleate)


Evidence for Use in Irritable Bowel Syndrome (IBS) and Functional Bowel Disorders

Gast Reg was studied for conditions characterized by fluctuating or episodic manifestations of bowel trouble, most notably Irritable Bowel Syndrome (IBS). The evidence base primarily consists of short-term Randomized Controlled Trials (RCTs). These are clinical studies where participants are randomly assigned to receive either the compound or a comparison treatment, such as a placebo (an inactive substance), over a defined time interval. Researchers primarily monitored outcomes related to physical discomfort, specifically tracking patient-reported outcomes describing perceived discomfort and shifts in their stool frequency and consistency.

Across the systematic reviews that summarized the original trials, findings were mixed regarding overall global symptom assessment. The research highlights changes measured during the study period, but long-term effects are not fully established, and certainty remains low for sustained relief.


Evidence for Use in Postoperative Motility Recovery

Research has explored its role in measuring the return of intestinal function following abdominal surgery. This condition is one where research examines temporary physiological imbalance.

Researchers monitored the time until the restoration of specific intestinal function milestones. The research highlights changes measured during the study period, but some of the evidence was derived from studies where the compound was administered by injection, which differs from the oral form. Therefore, comparative evidence is lacking for the oral formulation in this specific scenario.


Evidence in Special Populations

Research has explored studies including the compound's use in children and adolescents with functional abdominal pain disorders. However, data for certain groups remain insufficient. For instance, evidence for studies including older adults with different levels of comorbid conditions is not as extensively developed. Furthermore, comparative evidence is lacking for many special populations, meaning that results apply only to the populations studied.


What is Still Uncertain About Gast Reg Research

A fundamental gap is that follow-up durations were limited in most core studies. The research provides context but not personal outcomes, and stresses that research does not determine whether an individual will respond similarly to the group average observed in the trials.

Key Studies & References

  1. Product Monograph: lower gastrointestinal tract motility regulator (Health Canada)
  2. Trimebutine Maleate and Pinaverium Bromide for Irritable Bowel Syndrome: A Review of the Clinical Effectiveness, Safety and Guidelines

Frequently Asked Questions (FAQ)

Common questions about Gast Reg (FAQ)

Q: How quickly does Gast Reg start working?

A: Studies on how the body processes the active ingredient in Gast Reg indicate that it is absorbed quite rapidly after being taken by mouth. The highest concentration of the medicine in the bloodstream, according to pharmacokinetic data, is generally observed in less than one hour.


Q: How long does one dose of Gast Reg last?

A: Official regulatory instructions specify that the medicine should be taken three times daily (TID). This dosing schedule is established to maintain consistent levels of the active ingredient in the body, which aligns with its use for symptom management.


Q: Can Gast Reg affect blood pressure?

A: Official regulatory documents list side effects that are related to circulation, such as dizziness, pre-syncope (feeling faint), and syncope (fainting). Patients with concerns about these effects may consult the full safety information.


Q: Does Gast Reg interact with birth control pills?

A: Official regulatory profiles indicate there are no documented metabolic interactions involving liver enzymes, which is the common way some medicines interfere with oral contraceptives. No specific drug-drug combination is formally listed as contraindicated in the available information.


Q: Does Gast Reg come in different strengths?

A: Yes, official regulatory dosing guidelines mention typical unit doses ranging from 100 mg to 200 mg. This indicates that the medicine may be manufactured in different strengths.


Q: What kind of studies support the use of Gast Reg?

A: The evidence for Gast Reg is based primarily on short-term Randomized Controlled Trials (RCTs) and systematic reviews, as summarized in official overviews. These studies have examined its use in managing conditions involving irregular bowel movement and sensation, such as Irritable Bowel Syndrome (IBS).


Q: Is Gast Reg the same as other stomach medicines?

A: No, Gast Reg is classified by official sources as a gastrointestinal motility regulator and a spasmolytic agent. This means its primary role is to stabilize the movement and function of the digestive muscles, setting it apart from other types of stomach medicines like antacids or acid reducers.


Q: What should I do if I experience a very rare side effect from Gast Reg?

A: If you experience any unusual or severe symptom, particularly a severe skin reaction or signs of hypersensitivity, official guidelines advise seeking medical help immediately. Official guidelines mention that patients may report adverse reactions to a healthcare provider or pharmacist, which supports the monitoring of the medicine’s safety profile.


Q: Is Gast Reg known to cause weight gain?

A: According to the official adverse reaction profile, weight gain is not explicitly listed as a reported side effect of Gast Reg.


Q: Does Gast Reg have a risk of dependence or addiction?

A: While the medicine acts on peripheral opioid receptors in the digestive system, official and clinical reports have described cases of abuse and dependence. This has been noted primarily in certain situations involving high doses or the injectable form of the medicine.


Q: Does Gast Reg require a lab test before starting it?

A: Official regulatory prescribing information for Gast Reg does not typically specify required routine screening lab tests that must be completed before starting treatment.


Q: Can Gast Reg be used by people with liver issues?

A: Some clinical studies have excluded patients with severe or chronic liver disease. Official prescribing information indicates that a healthcare provider’s careful consideration of the medicine is recommended, as the liver and kidneys are involved in processing and removing the medicine from the body.


Q: What is the approved use of Gast Reg in different countries?

A: Gast Reg is approved and marketed internationally for the treatment of Irritable Bowel Syndrome (IBS) and other functional gastrointestinal motility disorders. Its primary use is to stabilize erratic bowel function and manage associated pain.


Q: What is the recommended age range for Gast Reg use?

A: The medicine is primarily indicated for use in adults. Regulatory documents consistently state that it is not recommended for children under 12 years of age and is contraindicated (must not be used) in children under 2 years of age.


Q: Does Gast Reg affect mood or anxiety?

A: Anxiety is listed among the adverse reactions with a 'frequency not known' classification in official regulatory documents. Other general effects on mood are not specifically listed.


Q: What types of food are known to interfere with Gast Reg?

A: Official regulatory documents do not list specific food types known to interfere with the effectiveness of Gast Reg. However, the administration instructions advise taking the tablets before meals.


Q: Does Gast Reg change the color of urine or stools?

A: A change in the color of urine or stools is not listed among the reported side effects in the primary regulatory adverse reaction profile for Gast Reg.


Q: What patient populations are excluded from Gast Reg studies?

A: Clinical studies summarized in regulatory reviews have often excluded patients with certain severe pre-existing health issues. Examples of these populations include those with major psychiatric disorders, severe respiratory or central nervous system diseases, and chronic liver or renal disease.


Q: Why does my prescription bottle for Gast Reg have a specific warning label?

A: Warning labels on prescription bottles are mandated by government regulatory bodies to highlight important information about the medicine. The labels summarize specific risks or handling rules that are detailed in the full official prescribing information or patient leaflet.


Q: Do you have to take Gast Reg forever once you start?

A: Gast Reg is officially described in regulatory information as being used as a course of treatment for symptom management. Continuation and overall duration of treatment are decided based on the guidance provided by a healthcare provider.


Q: What is the official method for disposing of Gast Reg?

A: Regulatory instructions strictly mandate that the medicine must not be thrown in household waste or flushed down the toilet. Disposal must be carried out according to local official regulations for unused medical products, such as those provided by a community drug take-back program or a pharmacist.


Q: What are the signs of an allergic reaction to Gast Reg?

A: Official labeling lists severe skin reactions and hypersensitivity reactions, including anaphylactic shock, as potential adverse events. The potential signs associated with a serious hypersensitivity reaction are swelling of the face, tongue, or throat, hives, or difficulty breathing.


Q: Is Gast Reg a prescription-only medicine?

A: Gast Reg is typically classified as a prescription medicine, meaning authorization from a licensed healthcare provider is required for its use. It is not listed as a Controlled Substance in its regulatory classification.

How should Gast Reg be stored and disposed of?

The storage and disposal of Gast Reg (trimebutine maleate) must strictly follow the conditions defined by regulatory labeling to maintain the product's integrity and ensure safety.


Official Storage Requirements

Requirement Condition (Regulatory Standard)
Temperature Store at room temperature, typically below 25°C or 30°C.
Protection Must be kept in a dry place and protected from light and excessive heat.
Packaging Keep in the original container and ensure it is tightly closed.
Safety Keep the medicine out of the sight and reach of children.

Disposal Mandates

Expired or unused Gast Reg must be handled according to specific rules. Regulatory instructions require that the medicine must not be discarded in household waste or flushed down the toilet. Disposal must be carried out according to local, official regulations for unused medical products.

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

Available in countries:

Equivalent of Gast Reg found in:

A-Z Index: