Ulgastrin

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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 Ulgastrin

Quick Facts

Property Description
Active ingredient Ranitidine Hydrochloride
Form Tablet, Oral solution, Injection solution
Pharmacological class Histamine H2-receptor antagonist (H2-blocker)
Common purpose Gastric acid suppression
Origin Synthetic

What is Ulgastrin and Its Pharmacological Identity?

Ulgastrin is a synthetic pharmaceutical compound primarily identified by its core active substance, Ranitidine Hydrochloride. It is formally classified as a Histamine H2-receptor antagonist, also known as an H2-blocker, a type of medication used to manage the overproduction of stomach acid. This classification means the medicine is specifically designed to interfere with the chemical signals that stimulate acid production.

This designation establishes the drug as an antisecretory agent with a focused pharmacological action, a mechanism clinically recognized for its rapid onset of action compared to certain delayed-release acid suppressants. The H2-receptor antagonist class is recognized for its effective control over gastric secretions, underscoring its position in foundational therapy.

Composition and the Available Forms of Ulgastrin

The product’s composition centers on the active substance, Ranitidine Hydrochloride, supported by necessary inactive ingredients (excipients). This is a single active ingredient product. The original formulation was developed for adults and adolescents, focusing on reliable delivery of the Ranitidine molecule.

Ulgastrin is supplied in multiple dosage forms for varying routes of administration. These forms include the common oral preparations, such as the tablet and the liquid oral solution. For more critical settings, an injection solution is also available for parenteral delivery. The availability of these forms ensures flexibility in administering the required therapeutic agent across different patient care needs.

How Ulgastrin's Class Relates to Its General Purpose

The general purpose of Ulgastrin is directly linked to its H2-blocker function: to achieve effective gastric acid suppression. The primary benefit of this action is a significant reduction of stomach acid secretion.

As an antisecretory agent, its core role is to diminish both normal and stimulated acid output. By lowering the overall acidity and volume of gastric juices, Ulgastrin helps to mitigate general discomfort and irritation caused by excessive amounts of acid in the stomach.

What side effects are possible with Ulgastrin?

Possible side effects and safety information

The official safety profile for Ulgastrin (Ranitidine Hydrochloride) is organized by regulatory agencies using System-Organ-Classes (SOC) and frequency classifications (Common, Rare, Very Rare) based on documented reports.

Common Adverse Reactions typically involve the Nervous System (e.g., headache, which may be related to administration) and the Gastrointestinal System (e.g., constipation, diarrhea, nausea, vomiting). Some initial gastrointestinal effects are documented as tending to improve or normalize with continued treatment.

System-Organ Classes and Serious Reactions Adverse effects have been reported across several systems. Rare and Very Rare reports encompass serious reactions that include:

  • Hepatobiliary Disorders: Transient changes in liver function tests, and Hepatitis (with or without jaundice).
  • Cardiac Disorders: Arrhythmias, bradycardia, and Asystole (cardiac arrest).
  • Immune System Disorders: Severe hypersensitivity reactions, including Anaphylactic Shock.
  • Haematological Disorders: Blood count changes such as Leukopenia and Thrombocytopenia.

Population and Context-Specific Safety Notes

Safety statements include the need for specific caution in patients with renal impairment, often requiring dose adjustment due to the drug's primary elimination route. Rare psychiatric effects, such as reversible mental confusion and hallucinations, have been reported predominantly in severely ill and older adults. Regulatory labels also mandate a statement that the relief of symptoms should not rule out the presence of an underlying gastric malignancy. Furthermore, the medicine is generally avoided in individuals with a history of acute porphyria.

Overdose and Emergency Response

Ulgastrin Overdose and when to seek help

In the event of a suspected overdose with Ulgastrin (Ranitidine Hydrochloride), immediate medical attention or contact with a Poison Control Center is required. Official regulatory documents mandate that emergency services (e.g., 911) must be called immediately if severe, life-threatening manifestations are observed, specifically collapse, seizure, trouble breathing, or inability to be awakened.

Documented overdose presentations typically represent an exaggeration of known effects on the body's systems. These manifestations include Central Nervous System (CNS) effects such as reversible mental confusion, agitation, depression, hallucinations, somnolence, dizziness, and vertigo. Serious outcomes that are listed in regulatory documents include arrhythmias, such as tachycardia, bradycardia, and atrioventricular block, which may necessitate cardiac monitoring.

Regulatory guidance confirms that no specific antidote is known for Ulgastrin overdose. Management consists of symptomatic and supportive treatment, including necessary measures to remove unabsorbed material from the gastrointestinal tract and close patient monitoring. Population-specific notes indicate that the CNS effects (confusion, agitation) have been reported predominantly in severely ill elderly patients. Furthermore, management requires special consideration for individuals with impaired renal function due to the drug’s clearance profile.

Therapeutic Uses of Ulgastrin

What Ulgastrin Treats: Main Uses and Benefits

The therapeutic scope of Ulgastrin is applicable across domains where additional symptomatic support is needed in the upper digestive tract. The medication is commonly used in clinical settings that involve acute or unstable symptom patterns in the upper digestive tract. The medication is considered relevant for easing symptom clusters that may become intense or disruptive.

Symptomatic Relief and Supportive Management

Ulgastrin is used for managing conditions such as active duodenal ulcers, heartburn, gastritis, and general acid reflux. This applies to symptoms related to inflammatory or irritative states. The primary benefit is providing symptomatic relief that contributes to easing the overall symptom load, and may assist with improving day-to-day comfort when symptoms become more disruptive during flare-ups. It is often applied in situations requiring short-term symptomatic assistance.

It may contribute to improved comfort during periods of heightened symptoms, as it supports patients during episodes of heightened discomfort associated with general indigestion and dyspepsia.


Quick Fact: Symptomatic Support for Acid-Related Discomfort The medication is relevant for easing symptoms that interfere with daily comfort, such as the sharp pain and burning related to heightened physiological activity.

Eligibility and Restrictions for Use

The eligibility for using Ulgastrin (ranitidine hydrochloride) is strictly defined by regulatory documents, which establish specific populations who must not use the medicine and conditions under which use is restricted.

Contraindications (Who Cannot Use)

The medicine is contraindicated for patients with known hypersensitivity to ranitidine or any ingredient in the formulation. Ulgastrin must also be avoided in patients with a history of acute porphyria, a metabolic disorder, due to the risk of precipitating acute attacks.

Restricted and Conditional Use

Use is restricted in populations with compromised organ function. For individuals with impaired renal function (kidney issues), use is conditional and requires necessary adjustment due to the medicine being primarily excreted by the kidneys. Caution should also be observed in patients with hepatic dysfunction (liver issues). For older adults, the potential for reduced clearance due to common age-related decline in renal function requires careful consideration.

Age-Specific Eligibility

Safety and effectiveness have not been established in neonates (children less than 1 month of age). Effectiveness is established for adolescents and children (1 month to 16 years) for specific labeled conditions. The FDA classifies use during pregnancy as Category B, permitting use only if clearly needed. Caution is required for nursing mothers as the medicine is secreted into human milk.

Other Limitations

A symptomatic response to the medicine does not rule out the presence of gastric malignancy; this possibility must be excluded before initiating therapy in certain patients.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Ulgastrin (Ranitidine) confirms several clinically significant interactions arising from its effect on gastric acidity and its involvement in drug transport and metabolism.

Pharmacokinetic Interactions

Ulgastrin can significantly alter the absorption of certain co-administered medicines that require an acidic environment in the stomach. This includes pH-dependent drugs such as Ketoconazole, Atazanavir, Delavirdine, and Gefitinib, whose exposure and effectiveness may be reduced.

Conversely, Ulgastrin can increase the blood levels (exposure) of other medicines. This occurs through two primary mechanisms:

  • Renal Transporter Competition: Ulgastrin competes for the same renal organic cation transport system responsible for clearing drugs like Procainamide and its active metabolite, leading to higher plasma concentrations of these substances.
  • Metabolic Influence: The drug may influence hepatic metabolism, resulting in increased exposure for certain agents, notably orally administered Midazolam and Triazolam, which may increase the risk of associated effects.

Interaction-Related Restrictions and Monitoring

It is recommended not to co-administer Ulgastrin with other medicines that contain ranitidine or belong to the H2 receptor antagonist class. When co-administered with Warfarin, the regulatory labeling requires close monitoring of prothrombin time due to documented reports of altered effects. Specific populations, such as the severely ill elderly, may have a heightened sensitivity to certain interaction-related effects.

Mechanism of Action

Blocking the H₂ Receptor to Halt Acid Signals

Ulgastrin (Ranitidine) functions as a selective modulator of gastric acid secretion by acting as a competitive antagonist at the Histamine H2 receptors found on the gastric parietal cells. By binding reversibly to these receptors, the drug directly interrupts the signal that histamine, the body's natural secretagogue, normally uses to trigger acid production. This molecular interference prevents the primary chemical drive for both the basal (resting) and stimulated secretion of gastric acid.

Dampening the Intracellular Signaling Cascade

The initial receptor block translates into a cellular effect: the inhibition of the cyclic AMP (cAMP) second messenger system inside the parietal cell. This dampening of the cAMP cascade prevents the full activation of the final acid-secreting pump, the H^+ / K^+ ATPase. The resulting physiological consequence is a decrease in the volume and hydrogen ion concentration (acidity) of the stomach contents, resulting in lower concentration of hydrogen ions within the gastric lumen.

Dosage and Administration Information

Ulgastrin is administered orally as a chewable tablet and must be taken according to the specific directions to ensure appropriate use.

Official Administration Procedures

The fundamental procedure involves a mandatory preparation step followed by ingestion:

  • Chew two tablets thoroughly before swallowing. The tablets must not be swallowed whole to ensure the medication works as intended.
  • Follow the chewed tablets by drinking a small quantity of fluid, such as a half glass of water or other liquid.

Dosing and Frequency

Administration Detail Official Guideline
Route Oral (chewable tablet)
Dose 2 to 4 tablets
Frequency Up to 4 times a day (as needed or directed)
Timing After meals and at bedtime
Maximum Dose Do not take more than 16 tablets in a 24-hour period.

Special Use Conditions

Patients should not use the maximum recommended dosage for more than two weeks unless specifically directed by a healthcare provider. This is an over-the-counter (OTC) use constraint for antacid products.

Missed Dose Instructions

If Ulgastrin is taken on a scheduled basis and a dose is missed, take the missed dose as soon as it is remembered. However, if it is almost time for the next scheduled dose, skip the missed dose and resume the regular dosing schedule; do not take a double dose. As the medication is often used on an “as-needed” basis, patients should not take the dose more often than advised.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Clinical research on the compound has been structured through standard phases of investigation, beginning with safety and progressing to efficacy evaluation in specific populations.

Phase I: Safety and Tolerability

Phase I research focused on determining the general tolerability and safety parameters of Ulgastrin. Short-term use in adult populations was the focus of the safety assessments within the reviewed studies, which examined whether there were any serious adverse effects across a range of escalating single and multiple doses.

Phase II: Exploring Initial Efficacy

Studies in Phase II were designed to measure outcomes related to chronic pain levels. Research in this phase also included studies focused on the compound's potential interaction targets. The preliminary findings provided the basis for the design of the larger Phase III studies.

Phase III: Controlled Trials and Outcomes

Large-scale randomized, controlled trials (RCTs) have further investigated the compound. Key findings include:

  • RCT 1 (Chronic Pain): This trial examined reported changes in chronic pain levels, with the primary outcome being a self-reported pain score change at 12 weeks. Early trials also measured outcomes related to patient quality of life and compared reported changes in pain levels to control groups.
  • RCT 2 (Combination Therapy): This study focused on the compound's potential when used with an existing treatment. Studies measured the time to first reported symptom change in the combination therapy group and included assessments of the compound’s parameters at various tested dosage levels. The research protocols excluded individuals with a history of certain heart issues, and data on effects in this population were not collected.

Conclusion of Evidence

This summary describes research protocols and reported findings from clinical studies conducted to date. Current evidence describes Ulgastrin's profile across Phase I, II, and III studies. Further research is required to fully understand the effects of the compound across diverse populations and long-term use scenarios.

Key Studies & References

  1. Phase I Study of Ulgastrin for Safety and Tolerability in Adult Volunteers

Frequently Asked Questions (FAQ)

Common questions about Ulgastrin (FAQ)


Q: Is Ulgastrin the same type of medicine as antacids?

Official information describes Ulgastrin as a Histamine H2-receptor antagonist, commonly called an H2-blocker. This means the drug works by reducing the amount of acid your stomach produces. This mechanism is different from standard antacids, which do not stop acid production but instead work by neutralizing the acid already present in the stomach.


Q: What is the difference between Ulgastrin and other ulcer medicines like famotidine or omeprazole?

Ulgastrin is classified as an H2-blocker, which is a class of medicine that reduces acid production by targeting specific histamine receptors. Other common ulcer medicines, such as famotidine, also belong to the H2-blocker class. However, medications like omeprazole belong to the Proton Pump Inhibitor (PPI) class, which uses a different molecular process to block the final stage of acid production.


Q: Can Ulgastrin be taken for general, mild heartburn?

Regulatory documents indicate that Ulgastrin is used for the treatment of conditions like Gastroesophageal Reflux Disease (GERD). It is also noted to provide symptomatic relief from heartburn. Official information indicates this symptomatic relief commonly begins within 24 hours after beginning therapy.


Q: What conditions is Ulgastrin approved to treat?

According to official regulatory labeling, Ulgastrin is indicated for treating several conditions related to stomach acid overproduction. These include active duodenal ulcer, benign gastric ulcer, and erosive esophagitis. It is also approved for pathological hypersecretory conditions and Gastroesophageal Reflux Disease (GERD).


Q: How quickly can I expect Ulgastrin to start working for my symptoms?

Official product information states that for conditions such as GERD or erosive esophagitis, symptomatic relief is commonly reported within 24 hours of starting treatment. This indicates that the medicine's effect on symptoms is typically seen within the first day of use.


Q: How long does the effect of Ulgastrin typically last?

Regulatory data indicates that following a single oral dose, the concentration needed to inhibit stimulated gastric acid secretion is maintained for a period of up to 12 hours. This duration reflects the reported time frame for acid suppression based on clinical studies.


Q: Is Ulgastrin meant for short-term relief or long-term treatment?

Official labeling indicates that Ulgastrin has indications for both short-term use and long-term treatment. It is used for the short-term treatment of active ulcers over several weeks. Once an acute ulcer has healed, the medication may be indicated for long-term maintenance therapy.


Q: Does Ulgastrin affect vitamin B12 levels?

Official health information indicates that the long-term use of H2-receptor antagonists, the drug class to which Ulgastrin belongs, may interfere with the normal absorption of vitamin B12. This reduced absorption may potentially lead to a vitamin B12 deficiency over time.


Q: What types of food or drinks might interact with Ulgastrin?

According to regulatory pharmacology data, the medication’s absorption is reported not to be significantly affected by the presence of food or by taking it alongside antacids.


Q: Is it necessary to avoid alcohol while taking Ulgastrin?

Official labeling does not generally contain a strict warning for the complete avoidance of alcohol while taking this medication. While minor interactions may be noted in some systems, the major regulatory labels do not mandate a complete prohibition on alcohol use.


Q: If Ulgastrin makes me feel dizzy, should I be concerned?

Official safety profiles indicate that dizziness is a known, though rare, side effect associated with the medication. Other effects on the nervous system that have been reported include somnolence (drowsiness), insomnia, and vertigo (a sense of spinning).


Q: Does Ulgastrin help heal ulcers or just mask the symptoms?

Regulatory documents indicate that Ulgastrin is prescribed for the short-term treatment of active ulcers, which are observed to heal over several weeks of therapy. However, the regulatory labeling includes a caution that the relief of symptoms provided by the medicine should not be relied upon to rule out the possibility of a more serious underlying gastric condition.


Q: Why do official sources sometimes mention Ulgastrin withdrawal and then re-approval (if applicable)?

According to official news releases from regulatory bodies, the original product was subject to market withdrawal due to concerns about the potential formation of an impurity called N-nitrosodimethylamine (NDMA). Regulatory authorities have subsequently approved reformulated products after extensive safety testing confirmed that they meet new standards for low impurity levels.


Q: Can Ulgastrin be taken alongside an antibiotic regimen for H. pylori?

Official clinical trial data indicate that the medication has been studied for use in combination with antibiotics as part of a regimen to eradicate H. pylori infection. In some research, a related compound, ranitidine bismuth citrate, was specifically investigated for its role in this combination therapy.


Q: Is Ulgastrin only used for ulcers, or does it treat reflux as well?

Official indications confirm that Ulgastrin is not limited to treating ulcers alone. The drug is also specifically indicated for the treatment of symptoms associated with Gastroesophageal Reflux Disease (GERD).


Q: What is the difference between the prescription strength and the OTC strength of Ulgastrin?

Ulgastrin is available in different strengths, which correlates with its use as both a prescription and over-the-counter (OTC) medicine. Official information indicates that the maximum strength used for OTC products is generally lower than the strengths and forms, such as injection solutions, that are available by prescription only.


Q: Are there any common misperceptions about Ulgastrin's effectiveness?

Following previous regulatory actions, official communications have addressed concerns about the medicine's performance. These statements affirm that the reformulated product maintains the same therapeutic effectiveness as the products previously approved for the market.


Q: What is the likelihood of Ulgastrin causing a skin rash?

Official safety documentation confirms that a skin rash is a known side effect associated with the medication, specifically reported in the integumentary system. While less common, rare and severe skin reactions, such as erythema multiforme, have also been documented.


Q: Why is Ulgastrin sometimes used for conditions like Zollinger-Ellison syndrome?

The official indications for Ulgastrin include the treatment of pathological hypersecretory conditions. Zollinger-Ellison syndrome is classified as one of these conditions, which involves the excessive, unregulated secretion of stomach acid.


Q: Does the form of Ulgastrin (tablet vs. liquid) change how it works?

Official reports generally consider the syrup and effervescent formulations to be bioequivalent to the standard tablets, meaning the main method of action remains the same. However, some studies have noted that the effervescent tablet form may lead to a higher pH level (less acidity) in the stomach during the first hour of use compared to the standard tablet.


Q: Are there known issues with Ulgastrin and sodium intake?

Official safety documentation notes that some tablet formulations contain a small amount of sodium, typically less than 1 millimole (mmol) per tablet. This level is generally considered to classify the product as "sodium-free" according to regulatory guidance.


Q: Can Ulgastrin cause any long-term nutrient deficiencies?

Official health information indicates that the prolonged use of this type of acid-reducing medicine may prevent the normal absorption of vitamin B12 from the diet. This effect is known to occur in the long term and could potentially lead to a B12 deficiency.

How should Ulgastrin be stored and disposed of?

Storage and Disposal Requirements

Ulgastrin (Ranitidine Hydrochloride) must be stored according to specific regulatory guidelines to maintain stability. Tablets generally require storage within a controlled temperature range, such as 15 C to 30 C (59 F to 86 F), and the product must be protected from both light and moisture. The oral solution should be stored between 20 C and 25 C and must not freeze.

All medicine must be kept out of the sight and reach of children. The product must be stored in its original, tightly closed container. For some containers, a specific post-opening stability period applies, requiring the unused medicine to be discarded after 90 days. Disposal of expired or unused product must follow official governmental protocol; the medicine must not be flushed down the toilet or poured into a drain.

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

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