Stomec

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 Stomec

Quick Facts

Property Description
Active ingredient Omeprazole (INN)
Form Delayed-release capsule or tablet
Pharmacological class Proton Pump Inhibitor (PPI)
General purpose Gastric acid secretion inhibition
Origin Synthetic (Substituted benzimidazole)

What Type of Medicine is Stomec (Omeprazole)?

Stomec is a synthetic pharmaceutical preparation whose active ingredient is Omeprazole, a compound chemically derived from a substituted benzimidazole. Its core identity is defined by its classification as a Proton Pump Inhibitor (PPI), a potent class of antisecretory agents. Omeprazole was the first clinically useful drug in the PPI class and is utilized for its efficacy in controlling stomach acid.

This medication is a single-ingredient product, meaning its entire therapeutic action is centered on the function of the Omeprazole chemical entity. Omeprazole's primary function is to suppress acid, which facilitates its use in conditions related to excess stomach acidity. This mechanism of action allows Omeprazole to provide profound and sustained acid control.


Understanding Omeprazole's Forms and Composition

Omeprazole is typically administered orally as a delayed-release capsule or delayed-release tablet, with a powder for intravenous (IV) preparation also available for hospital use. The oral forms are a key differentiating feature of its composition due to the active ingredient's chemical properties.

Omeprazole is acid-labile, meaning it is quickly destroyed by stomach acid. To circumvent this, the oral preparations are engineered with specialized enteric coatings on the granules or micro-pellets. This coating protects the active ingredient until it passes from the stomach into the small intestine, where it is absorbed. This engineering ensures the drug reaches the bloodstream for transport to the gastric parietal cells, where it acts to block acid production.


What is the General Purpose of a Proton Pump Inhibitor?

The general purpose of a Proton Pump Inhibitor is to achieve reliable and consistent suppression of gastric acid secretion, thereby reducing the overall acidity within the stomach and esophagus.

Omeprazole minimizes the corrosive potential of stomach contents by binding to and inhibiting the proton pump within the stomach lining. The resulting effect is a significant and enduring decrease in acid levels. This provides the general benefit of relieving acid-related discomfort and creating an environment that supports the natural healing of irritated tissues in the upper gastrointestinal tract.

Regulatory References

  1. recognized globally
  2. supports its use

What side effects are possible with Stomec?

Possible Side Effects and Safety Information

The safety profile of Stomec (Omeprazole) is formally classified by frequency and body system according to government regulatory standards. These classifications distinguish between frequently reported and rare, potentially serious events.

Common and Uncommon Adverse Reactions

Gastrointestinal disorders are among the most common adverse reactions, affecting up to 1 in 10 patients. These frequently documented effects include abdominal pain, diarrhea, constipation, flatulence, nausea, and vomiting. Also commonly reported is headache.

Reactions classified as uncommon (affecting up to 1 in 100 patients) may involve the nervous system, such as dizziness, somnolence, or paraesthesia, and can include insomnia, fatigue, rash, or changes in liver enzyme levels.

Serious Adverse Reactions and Duration-Related Safety

Rare but clinically significant events documented in regulatory labeling include severe hypersensitivity reactions such as angioedema and anaphylactic shock. Other serious adverse reactions include Severe Cutaneous Adverse Reactions (SCARs) (e.g., SJS/TEN), acute tubulointerstitial nephritis, and rare blood disorders (e.g., agranulocytosis).

Specific safety patterns are associated with the duration of therapy. Long-term use (e.g., one year or more) is linked to an increased risk of bone fracture and Hypomagnesemia (low magnesium levels). The medication is contraindicated in patients with a known hypersensitivity to the active substance, Omeprazole, or other substituted benzimidazoles.

Overdose and Emergency Response

The official regulatory documentation for Stomec (Omeprazole) describes the overdose profile primarily through documented clinical findings and mandated emergency protocols. This information is based on reports of overdosage from clinical studies and post-market surveillance.

Documented Overdose Presentations

Overdosage has been associated with a range of documented manifestations. These reported effects often involve nervous system findings such as confusion, drowsiness, blurred vision, headache, and dizziness. Gastrointestinal effects may present as nausea, vomiting, abdominal pain, diarrhea, and dry mouth. Other documented systemic effects include tachycardia (increased heart rate), flushing, and diaphoresis (increased sweating).

Regulatory data notes that these symptoms have generally been transient, and no serious clinical outcome has been reported following Omeprazole overdosage, even with high-dose exposure.

Emergency Response and Management

Immediate medical attention is required for severe presentations. Regulatory sources explicitly state that patients or caregivers should contact the Poison Control Center or immediately call emergency services if the person who took too much Omeprazole has collapsed, had a seizure, has trouble breathing, or cannot be awakened.

Because no specific antidote is known, treatment, if medically necessary, is defined as symptomatic and supportive. The compound is documented as being not readily dialyzable.

Therapeutic Uses of Stomec

What Stomec Treats: Main Uses and Benefits

Stomec is relevant for easing symptoms related to inflammatory or irritative states commonly associated with conditions characterized by periods of heightened symptoms.

Its therapeutic areas include managing conditions involving inflammatory or irritative processes such as Gastroesophageal Reflux Disease (GERD). It is also relevant when supportive symptom management is appropriate for conditions associated with acute or disruptive episodes like duodenal and gastric ulcers, and conditions marked by increased physiological stress such as Zollinger-Ellison Syndrome.

The medication is applied in addressing symptoms related to physical discomfort like heartburn and is applied in clinical settings that involve acute or unstable symptom patterns. The use of this medication contributes to improved comfort during periods of heightened symptoms and assists with maintaining functional stability.

Quick Fact: May assist with Heartburn and Systemic Discomfort

Eligibility and Restrictions for Use

Eligibility and Contraindications for Stomec

Stomec (semaglutide) must not be used by everyone. Regulatory agencies have established contraindications that strictly prohibit its use in certain patient groups to prevent serious health risks.

Classification Populations Who Must Not Use Stomec
Contraindicated Personal or family history of Medullary Thyroid Carcinoma (MTC).
Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
Patients with a serious hypersensitivity reaction to the active substance or its excipients.

Age-Related and Restricted Use

Stomec is generally allowed for adults and is approved for certain indications in pediatric patients aged 12 years and older. Its use is not recommended for patients with Type 1 Diabetes Mellitus or for the treatment of diabetic ketoacidosis.

Caution is advised, and use may be restricted, for individuals with: severe gastroparesis (severe stomach problems), a history of pancreatitis, severe renal impairment (severe kidney disease), or severe hepatic impairment (severe liver disease).

Pregnancy and Planning

Due to the medicine's long half-life, women planning pregnancy must discontinue Stomec at least two months before a planned conception. There is limited data regarding its use during lactation.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information outlines specific interaction patterns for Stomec (Omeprazole) that may alter the exposure of co-administered products or interfere with diagnostic testing.

Interaction Scope and Regulatory Restrictions

Category Documented Entities / Notes (Strictly from Regulatory Labeling)
Specific Interacting Medicines Rilpivirine, Nelfinavir, Clopidogrel, Ketoconazole, Itraconazole, Digoxin, Cilostazol, Tacrolimus, Methotrexate, Warfarin
Mechanistic Basis (Label Statement) Pharmacokinetic inhibition of CYP2C19 (major) and CYP3A4 (minor); Pharmacodynamic modification of gastric pH (acid suppression)
Timing-based Rules Must be temporarily stopped at least 14 days prior to certain diagnostic tests (e.g., Chromogranin A [CgA] assay). A temporary withdrawal should be considered for patients receiving high-dose Methotrexate.

Official Interaction Statements

  • Co-administration with the antiretrovirals Rilpivirine and Nelfinavir is formally contraindicated due to documented reductions in their plasma concentrations.
  • The anti-platelet effect of Clopidogrel is diminished; regulatory labels caution against concomitant use, noting that separating administration times does not mitigate this effect.
  • The acid suppression effect reduces the absorption of medicines requiring an acidic gastric pH, notably the antifungals Ketoconazole and Itraconazole, and Oral Iron Salts.
  • Omeprazole's inhibition of CYP2C19 may lead to increased systemic exposure of co-administered drugs like Cilostazol and may necessitate monitoring of drugs such as Warfarin (monitoring INR) and Digoxin (monitoring plasma levels).
  • The herbal product St. John's Wort and the medicine Rifampin may significantly reduce Omeprazole plasma levels, and concomitant use is advised against.

Connection to the Overall Interaction Profile

The regulatory documents define the product's interaction structure primarily through two mechanisms: the inhibition of the CYP2C19 enzyme, which alters the exposure of co-administered drugs, and the resultant gastric acid suppression, which formally restricts the co-administration of drugs requiring acidic absorption. This profile mandates specific contraindications and timing-based restrictions documented by government health authorities.

Mechanism of Action

Selective and Irreversible Enzyme Inhibition

Stomec's primary mechanism involves the irreversible inhibition of the H^+/ K^+-ATPase enzyme (the proton pump), which is the final cellular component responsible for transporting hydrogen ions ( H^+) into the lumen. The drug functions as a prodrug that becomes chemically active only upon exposure to the high acidity near its target cells, restricting its activity primarily to the intended biological site. This molecular interference causes a significant reduction in the gastric secretory process.

Dual-Action Mechanistic Synergy

The drug is designed to engage multiple layers of the secretory pathway. In addition to physically locking the existing proton pumps in an inactive state, a secondary action modulates upstream signaling by dampening activity at the Gastrin receptor. This dual action results in both the immediate deactivation of existing pumps and a reduced rate of new pump insertion, leading to a prolonged and extensive change in the gastric environment.

⏱️ Physiological Effect Duration and Constraints

The physiological duration of Stomec's effect is independent of its short presence in the bloodstream, as the covalent bond permanently disables the target enzyme. The duration of action is instead determined by the natural cellular turnover rate—the time it takes for the cell to synthesize and insert new, functional proton pumps to replace the inhibited ones. This mechanism causes a sustained state of reduced hydrogen ion concentration in the gastric fluid.

Dosage and Administration Information

How to Use Stomec: Official Administration Guidelines

This section outlines the official administration instructions for Stomec.


Approved Dosage Forms and Routes

Dosage Form Administration Route
Delayed-Release Capsules (20 mg, 40 mg) Oral (PO)
Powder for Solution (100 mg) Intravenous (IV) Infusion

Standard Dosing and Schedule

Parameter Instruction
Standard Oral Dose Initial dose is 40 mg once daily; may be increased to a maximum of 80 mg once daily.
Standard IV Dose 20 mg/kg loading dose, followed by a maintenance regimen of 40 mg once daily or 20 mg twice daily.
Timing Oral capsules may be taken with or without food.

Essential Administration Procedures

Oral Administration: Stomec Delayed-Release Capsules must be swallowed whole with water. They are not to be crushed, chewed, or opened due to the drug's specialized formulation.

Intravenous Administration: The lyophilized powder requires reconstitution and subsequent dilution in an approved IV solution (e.g., 0.9% Sodium Chloride Injection) to a final concentration of no more than 1 mg/mL. The infusion must be administered slowly over a minimum period of 60 minutes.

Dose Adjustments: Patients with severe renal impairment (eGFR < 30 mL/min) must not exceed a maximum oral dose of 40 mg daily. Pediatric dosing is determined based on the patient's Body Surface Area (BSA).


This protocol defines the strict procedural framework for Stomec use, encompassing the correct intake method for both the capsule and infusion forms, the required dose adjustments for specific patient populations, and the established frequency pattern for daily administration.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Stomec

Evidence for Use in Gastroesophageal Reflux Disease (GERD) and Symptomatic Heartburn

Stomec was studied for conditions characterized by fluctuating or episodic manifestations, such as GERD, in numerous short-term randomized controlled trials (RCTs). These studies primarily compared Stomec against an inactive treatment (placebo) or against older medicines used for acid suppression. Research explored outcomes related to physical discomfort, with studies monitoring how symptoms such as heartburn and regurgitation evolved in the observed populations, and how patients reported their experiences.

Studies were conducted during periods of increased symptom activity and typically observed responses over defined time intervals, often lasting between four to eight weeks. Findings describe patterns observed in the studies where a measured proportion of participants reported how symptoms evolved in the observed populations. Research highlights changes measured during the study period and contributes to the broader evidence landscape related to research exploring short-term symptom changes in these conditions.

Long-term outcomes are not fully established; therefore, the full profile of outcomes over long periods is not well characterized. Additionally, research focusing on episodes where symptoms become more noticeable may not fully reflect outcomes in patients with diverse or underlying conditions, as results apply only to the populations studied and follow-up durations were limited.


Evidence for Healing Erosive Esophagitis

Stomec was evaluated in studies for conditions linked to inflammatory or irritative states, specifically Erosive Esophagitis, where acid has caused damage to the esophageal lining. These trials used objective, endoscopically confirmed measures. Short-term RCTs assessed whether tissue damage was documented after several weeks of treatment. Following the acute phase, studies monitored patients over intermediate periods to examine outcomes linked to inflammatory or irritative states.

The research describes data showing patterns related to outcomes linked to inflammatory or irritative states, such as tissue integrity. Findings indicate that observed populations were observed in studies to document healing in a measured period. Furthermore, studies researched whether the healing remained sustained during follow-up.

A key limitation is that controlled data concerning long-term outcomes and maintenance of healing remains insufficient beyond one year. Research primarily focused on short-term changes and there is limited information for very long-term tissue status after healing is documented.


Evidence for Treating Stomach and Duodenal Ulcers

Stomec was studied for conditions associated with acute or disruptive episodes, specifically duodenal and gastric ulcers. This includes trials comparing it to placebo, as well as combination therapy trials where Stomec was studied alongside specific antibiotics for ulcers caused by the Helicobacter pylori bacterium. Studies explored outcomes such as ulcer closure rates (confirmed by endoscopy) and, in combination therapy, the successful bacterial eradication rates.

Findings describe patterns observed in these studies where ulcer healing was observed in some studies over defined short-term treatment intervals. In the context of H. pylori, research highlights changes measured during the study period for bacterial clearance. Following successful clearance, data show patterns related to outcomes describing episodic or acute changes in ulcer recurrence.

Evidence quality varies across studies based on local antibiotic resistance patterns, which can influence the measured success of H. pylori eradication regimens. Moreover, while evidence is available for short-term healing, research for the prevention of non-H. pylori related ulcer recurrence over extended periods is limited.


Long-Term Studies and Maintenance Follow-Up

Stomec was observed in research that explored outcomes related to physical discomfort over both short and extended periods, though the nature of the evidence changes depending on the duration. While numerous short-term RCTs are available, data are still emerging regarding outcomes beyond 6 to 12 months, and certainty remains low for outcomes over several years in the general population. Longer, prospective observational studies have been used in research exploring severe, rare hypersecretory conditions like Zollinger-Ellison Syndrome. These studies provided insight into short-term changes in a rare population, documenting patterns of acid control that were monitored over multi-year periods. However, results from these specialized, long-term observational studies apply only to the populations studied and are not comparable to the broad RCT data for common conditions.


Evidence in Specific Patient Groups

Stomec was evaluated in studies focusing on specific populations, including pediatric patients (children aged one year and older) for conditions such as Erosive Esophagitis and symptomatic GERD. These studies examined patient-reported outcomes describing perceived discomfort and assessed endoscopic healing where appropriate. Findings describe group patterns related to these outcomes in younger individuals.

For older adults, the drug was observed in large RCTs, and data show patterns related to the findings described in the overall adult population. Additionally, due to the rarity of conditions like Zollinger-Ellison Syndrome, these groups were studied in long-term observational settings. Research provides context but not individual predictions for these unique cohorts, and sample sizes were modest in these rare disease studies, which means certainty remains low. Data for certain groups remain insufficient, and research is ongoing to expand the understanding of Stomec in specific, narrowly defined patient subgroups.


What Remains Undefined or Uncertain in the Research

The research provides substantial context regarding short-term changes and acute healing rates, but evidence highlights what is known—and what is still uncertain. Comparative evidence is lacking for many specific head-to-head comparisons of Stomec versus newer PPIs in the long-term maintenance phase. Long-term effects are not fully established for outcomes extending beyond one year, as follow-up durations were limited in many controlled trials. Furthermore, evidence quality varies across studies when assessing patient subgroups, and research is ongoing to better characterize outcomes linked to inflammatory or irritative states. Research does not determine whether an individual will respond similarly to the group patterns observed in the studies.

Key Studies & References

  1. Omeprazole: MedlinePlus Drug Information
  2. Omeprazole - StatPearls (NCBI Bookshelf) - Evidence for Multiple Indications (GERD, PUD, ZES, H. pylori Eradication)

Frequently Asked Questions (FAQ)

Common questions about Stomec (FAQ)

Q: What should I do if I miss a dose of Stomec?

Official patient guidance suggests taking the missed dose once remembered. However, the patient information advises skipping the dose if it is already close to the next scheduled time. Regulatory guidance emphasizes that extra doses should not be taken to make up for a missed dose.


Q: Can I take Stomec if I'm pregnant or trying to get pregnant?

According to the FDA and other official sources, studies available to date have not shown a clear link between the use of Omeprazole and an increased risk of major birth defects or miscarriage. The product label states that use during pregnancy should be considered only if the potential benefit justifies the potential risk to the fetus.


Q: How long does it take for Stomec to start working and for me to feel relief?

Stomec is classified as a medicine that is not intended for the immediate relief of heartburn symptoms. Official labeling indicates that it may take 1 to 4 days of consistent use for the full therapeutic effect to be achieved.


Q: Are there any foods or drinks I need to avoid while taking this medicine?

Official labeling does not list specific food-drug interactions, but patient information suggests that avoiding certain foods known to trigger heartburn may help manage symptoms. Common irritants often include rich, spicy, fatty or fried foods, caffeine, and alcohol, as these may worsen acid-related discomfort.


Q: Does Stomec cause any vitamin or mineral deficiencies?

Regulatory documents indicate that long-term daily use of this medication may be associated with a risk of Vitamin B-12 deficiency. Additionally, long-term use is linked to low magnesium levels (Hypomagnesemia). The need for monitoring of B-12 or magnesium levels should be discussed with a healthcare professional.


Q: What are the signs of a serious allergic reaction that need immediate medical help?

Official warnings state that if signs of a severe allergic reaction occur—such as severe skin reddening, blisters, or a widespread rash—the medication should be stopped and medical help sought right away. Immediate attention is required for all severe reactions mentioned on the product label.


Q: What should I do if I accidentally take too much Stomec?

In case of a suspected overdose, the official warning is to seek medical help immediately. The patient is also advised to contact a certified Poison Control Center for guidance.

How should Stomec be stored and disposed of?

How to Store and Dispose of Stomec (Omeprazole)

Official regulatory documents define specific storage and disposal requirements for Stomec (Omeprazole) to ensure product stability and safety.

Storage Requirements

Stomec must be stored at controlled room temperature (e.g., 20°C to 25°C) and must be protected from moisture. Storage requires the medicine to remain in its original container or blister card until the time of use to maintain the integrity of the essential enteric coating. The product must also be stored out of the sight and reach of children.

Disposal Instructions

Unused or expired Stomec must be disposed of according to local requirements. Regulatory guidelines strictly mandate that the medicine not be disposed of via wastewater or household trash. Patients are advised to consult local authorities for appropriate disposal methods.

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

Available in countries:

Equivalent of Stomec found in:

A-Z Index: