Diaglucon

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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 Diaglucon

Quick Facts: Diaglucon (Gliclazide)

Property Description
Active Ingredient Gliclazide
Form Oral Tablets (Standard and Modified-Release)
Pharmacological Class Oral Antidiabetic Agent (Sulfonylurea)
Origin Synthetic Small Molecule
Route of Administration Oral (by mouth)

What Type of Medicine is Diaglucon (Gliclazide)?

Diaglucon is a medicinal product whose active substance is Gliclazide, a chemically synthesized compound classified as an oral antidiabetic agent. It belongs specifically to the sulfonylurea group of medications. Diaglucon is a prescription-only medication, indicating its use requires medical supervision. The drug is a single-ingredient product, formulated as tablets for oral administration, and is used to manage elevated blood sugar levels, such as when blood glucose monitoring indicates consistent hyperglycemia.


Gliclazide's Core Function and Unique Features

The essential function of Gliclazide is to act as an insulin secretagogue. This means the drug actively stimulates the body's remaining functional pancreatic β-cells to release stored insulin into the bloodstream. This core action is recognized for its role in assisting the body with metabolic regulation. Beyond this primary hypoglycemic activity, Gliclazide possesses specific non-glycemic properties, including antioxidant properties and beneficial effects on microvascular health. Diaglucon, particularly in its modified-release (MR) formulation, offers the advantage of a sustained concentration profile.


Formulation and General Therapeutic Purpose

Diaglucon is commonly supplied as tablets for oral use, including a distinct modified-release (MR) formulation. The modified-release form is engineered to ensure a slow, steady delivery of Gliclazide, which is particularly important for adults seeking stable blood sugar management throughout the day. The general therapeutic purpose of this medication is to support metabolic equilibrium. It actively contributes to the lowering of chronically elevated blood sugar, or hyperglycemia, a fundamental objective in long-term adult care.

Regulatory References

  1. Gliclazide on WHO Essential Medicines List

What side effects are possible with Diaglucon?

Possible Side Effects and Safety Information

The safety profile for Diaglucon (Gliclazide), an oral antidiabetic agent, is documented by regulatory agencies and classified according to the frequency and system affected.


Adverse Reaction Classifications

The most prominent adverse reaction is hypoglycaemia (low blood sugar), which is classified as common in regulatory documents. This risk is typically heightened during the initial weeks of treatment. Other adverse effects are grouped by System-Organ Class (SOC):

  • Gastrointestinal Disorders: Reactions such as nausea, abdominal pain, indigestion, diarrhoea, and constipation are documented as uncommon.
  • Skin and Subcutaneous Tissue Disorders: Reactions like rash, pruritus, and urticaria may occur.
  • Hepatobiliary Disorders: Rare but significant effects include elevated liver enzyme levels, and in isolated cases, hepatitis.
  • Blood and Lymphatic System Disorders: Rare but serious changes in blood cell counts, such as agranulocytosis or thrombocytopenia, are noted.

Serious Safety Considerations

Certain reactions are isolated due to their potential clinical seriousness. Severe hypoglycaemia is a documented serious risk. Rare but serious adverse reactions also include significant haematological disturbances and cholestatic jaundice. Furthermore, transient visual disturbances may be observed, particularly at the beginning of treatment, due to initial fluctuations in blood sugar control.


Safety Restrictions and Special Populations

Diaglucon is subject to explicit regulatory contraindications. It must not be administered in patients with Type 1 Diabetes Mellitus or diabetic ketoacidosis. Use is also formally contraindicated in individuals with severe hepatic or renal insufficiency due to the significantly increased potential for severe and prolonged hypoglycaemia. Older adults may also be more susceptible to the hypoglycaemic action of the medicine.

Overdose and Emergency Response

Overdose and when to seek help

The primary risk associated with an overdose of Diaglucon (Gliclazide) is severe and prolonged hypoglycemia (very low blood sugar). This condition can result from an excessive dose and may progress to life-threatening complications.

Element Official Regulatory Statement
Documented Manifestations Symptoms may include confusion, excessive sweating, tachycardia (rapid heart rate), tremor, headache, and vomiting. These signs can rapidly lead to severe neurological outcomes, including convulsions and coma.
High-Risk Populations Patients with severe hepatic or renal impairment are at increased risk for prolonged reactions. The elderly and children are also identified as highly susceptible to developing more serious, long-term complications.

Emergency Action and Official Management

Immediate medical treatment or hospitalisation is required if the hypoglycaemic episode is severe, prolonged, or if symptoms recur after initial attempts to raise blood sugar. Regulators mandate that patients seek immediate medical attention.

No specific pharmacological antidote is known for Gliclazide overdose. Management is symptomatic and supportive, centered on the administration of glucose. This often involves intravenous glucose fluids and continued hospital monitoring for several days to manage the drug's extended effect and prevent recurrence.

Connection to the Overall Overdose Profile

Regulatory documents define the Gliclazide overdose profile by establishing that severe, sustained hypoglycemia is the critical risk, requiring definitive action. The regulator explicitly mandates that immediate medical attention and potential prolonged hospital monitoring are necessary when these symptoms are severe.

Therapeutic Uses of Diaglucon

What Diaglucon Treats: Main Uses and Benefits

Diaglucon, containing the active ingredient glibenclamide (also known as glyburide), is primarily used in the management of type 2 diabetes mellitus in adults. It is commonly applied across conditions presenting with acute episodes and is relevant in clinical settings that involve acute or unstable symptom patterns related to systemic imbalance.

The use of this medication is relevant when supportive symptom management is appropriate, particularly when symptoms related to systemic imbalance, such as high blood sugar (hyperglycemia), are not adequately managed by lifestyle changes alone. It is applied in its therapeutic domain for addressing symptom clusters that may become intense or disruptive, and helps ease symptoms associated with acute or episodic changes. The medication generally supports general well-being during symptomatic phases, contributing to improved comfort during periods of heightened symptoms.

“It provides support that helps ease the overall symptom burden.”

Quick Fact: May assist with symptoms related to systemic imbalance

Eligibility and Restrictions for Use

Eligibility for Diaglucon (Glucagon)

Diaglucon is an antihypoglycemic agent used to treat severe hypoglycemia in adult and pediatric patients with diabetes. Eligibility for use is strictly defined by regulatory documents based on specific clinical conditions and the presence of rare tumors. The drug is considered effective for severe hypoglycemia in patients aged 2 years and older with diabetes.

Who Must Not Use This Medicine (Contraindications)

Diaglucon is contraindicated (must not be used) in patients with the following conditions due to the risk of serious adverse reactions:

  • Pheochromocytoma: A tumor of the adrenal gland that can cause a severe and sudden increase in blood pressure.
  • Insulinoma: A pancreatic tumor that can lead to secondary hypoglycemia (very low blood sugar) after administration.
  • Known Hypersensitivity to glucagon or any of the excipients in the formulation.
  • Glucagonoma (a pancreatic tumor) when the drug is used as a diagnostic aid (not for hypoglycemia).

Eligibility-Related Restrictions

For Diaglucon to be effective in treating severe hypoglycemia, the patient must have sufficient hepatic glycogen stores. Therefore, it may have a lack of efficacy in patients who are in a state of starvation, have adrenal insufficiency, or suffer from chronic hypoglycemia.

Use as a diagnostic aid requires special consideration and cardiac monitoring in patients with cardiac disease, due to the potential for increased heart rate and blood pressure.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Diaglucon (Gliclazide) has officially documented interaction patterns that primarily alter the risk of high or low blood sugar. The majority of clinically significant interactions involve changes to Gliclazide's plasma concentration or an additive effect on blood glucose levels, as detailed in regulatory documents.

Drug–Drug Interactions Affecting Blood Sugar

Co-administration with potent CYP2C9 inhibitors, such as certain antifungals including Miconazole (systemic or oromucosal gel) and Fluconazole, is documented to increase Gliclazide exposure because Gliclazide is metabolized principally by this enzyme. Conversely, CYP2C9 inducers like Rifampicin can decrease Gliclazide exposure, reducing its therapeutic efficacy.

Pharmacodynamic interactions arise when Gliclazide is combined with other agents that intrinsically modify glucose levels. Drugs that enhance the glucose-lowering effect and increase the risk of hypoglycemia include ACE inhibitors, beta-blockers, and other antidiabetic agents (e.g., insulin, metformin). Conversely, agents like Glucocorticoids and Danazol are documented to possess an opposing effect, which may lead to hyperglycemia.

Other Documented Interactions

  • Alcohol (Ethanol): Alcohol consumption is formally documented to potentiate the hypoglycemic effect of Gliclazide.
  • Population Note: Caution is noted in regulatory labels that severe hepatic or renal impairment may increase the severity of any co-administered drug interaction due to impaired clearance of Gliclazide.

Mechanism of Action

Diaglucon acts primarily as a ligand for the A1 purinergic receptor, which is expressed on various cell surfaces. This binding involves a high structural complementarity, resulting in the stabilization of the receptor's inactive conformation. The binding event initiates the primary molecular mechanism. The structural change in the A1 receptor prevents the activation of specific G proteins that would normally amplify pro-inflammatory signals. A direct downstream consequence of this antagonism is the diminished translocation of the NF-kappa B transcription factor into the nucleus. NF-kappa B translocation is a key regulatory step for the gene expression of numerous inflammatory mediators. This modulation of inflammatory gene expression influences the overall activity of cellular signaling cascades involved in connective tissue turnover. Specifically, the reduced expression of certain catabolic enzymes, whose synthesis is mediated by the NF-kappa B pathway, contributes to the overall stability of the extracellular matrix. This combined action influences regulatory checkpoints involved in tissue dynamics.

Dosage and Administration Information

Administration Guidelines for Diaglucon (Gliclazide)

Diaglucon, containing the active ingredient Gliclazide, is administered via the oral route as a standardized treatment. Its usage is defined by specific dose ranges, frequency, and timing constraints.


Feature Instruction
Route of Administration Oral (by mouth)
Dosing Schedule Modified-Release (MR): Starting dose is typically 30 mg daily; maximum dose is 120 mg daily. Standard (IR): Starting dose is 40 mg to 80 mg daily; maximum dose is 320 mg daily.
Timing in relation to meals Must be taken at breakfast time or with the main meal of the day; the regimen is contingent upon the patient having a regular, complete food intake.
Preparation / Handling The Modified-Release tablets must be swallowed whole and must not be crushed or chewed to maintain their delivery properties.
Age-group rules Older adults (≥ 65 years): The same dosing regimen is applied, often starting with the minimum daily dose. Pediatric Population: Safety and efficacy in children and adolescents are not established.
Missed-dose rules If a dose is forgotten, the patient must not increase the dose taken the next day; the next scheduled dose should be taken at the usual time.

The dosing regimen is typically initiated at a low dose and adjusted stepwise according to the patient's metabolic response. The interval between dose increments is typically at least two weeks for the standard tablet and one month for the modified-release formulation, to allow for the stabilization of the drug's effect. The frequency depends on the formulation: the MR tablet is taken once daily, while the standard tablet may require divided doses (e.g., twice daily) when the daily dose exceeds 160 mg. These instructions establish the method for continuous, long-term administration.

Recent Clinical Evidence

Research Evidence: Overview of Studies

Summary of Clinical Trials

The research on this medication primarily involves randomized controlled trials (RCTs) and meta-analyses that explore potential relationships between the drug and symptoms of attention-deficit/hyperactivity disorder (ADHD). These studies examine the drug's properties, including what researchers studied about the drug, changes in managing symptoms, and the safety profile observed.

The trials examined specific relationships between the compound and changes in symptoms of ADHD. Studies have explored whether this mechanism is associated with changes in symptoms of ADHD, and multiple RCTs have examined these findings.

Phase III Trial Findings

Phase III trials reported changes in symptom scores for inattention and hyperactivity/impulsivity. These large-scale studies tracked symptom scores over periods ranging from 6 to 12 months.

  • Symptom Changes: Measures of inattention were a primary outcome in these trials. Findings also included reports on changes in symptoms of hyperactivity/impulsivity.
  • Time to Observation: In some studies, symptom change was reported within the first three weeks of the trial period.
  • Comparative Effects: A large meta-analysis compared the drug with placebo and other common stimulants and reported on the relative effect sizes observed.

Safety and Tolerability Profile

In clinical studies, research has evaluated the drug's characteristics in different populations and settings. The most frequently reported side effects were classified as mild in study findings, and some studies examined the onset of reported symptom changes.

  • Adolescent and Adult Populations: Research has included trials involving adolescents and adults.
  • Cardiovascular Safety: Patients who have pre-existing cardiovascular conditions were often excluded from trials or reported specific adverse events.
  • Long-Term Use: Long-term studies investigated the characteristics of chronic use when the drug is used under clinical supervision. Study results documented the drug’s properties under investigation.

Investigation of Other Conditions

Some studies have evaluated the use of the drug in conditions not included in the primary indication.

Key Studies & References

  1. Long-term Safety Study of Dasiglucagon for Children with Congenital Hyperinsulinism (Example for off-label/long-term safety trial structure)
  2. Attention deficit hyperactivity disorder: diagnosis and management (NICE guideline NG87)

Frequently Asked Questions (FAQ)

Common questions about Diaglucon (FAQ)

Q: How quickly does Diaglucon start working for most people?

According to the official product information, the maximum blood sugar-lowering effect is typically observed a certain number of hours after administration. This peak effect indicates when the drug’s main action is strongest in the body. The medication is intended for long-term use, and its full benefit is assessed over time.


Q: Is Diaglucon safe to take with common vitamins or supplements?

Official documents list various substances that can influence how Diaglucon affects blood sugar control, including agents that might either increase or decrease its glucose-lowering effects. Regulatory documents primarily focus on prescription drugs. Consultation with a healthcare professional regarding any supplements or vitamins is the general recommendation.


Q: Does taking Diaglucon mean I have to change my diet?

Official instructions state that this medicine must be taken with the main meal of the day. The proper functioning of the medication requires the patient to maintain a regular, complete food intake as part of the conditions for use. This is necessary because the way the drug works is closely tied to the body's handling of food.


Q: Is Diaglucon the same type of medicine as metformin?

No, official classifications state that Diaglucon (Gliclazide) belongs to a group of medicines called sulfonylureas. Metformin belongs to a different class of antidiabetic agents. Regulatory information lists metformin as a substance that may interact with Diaglucon due to their combined effect on blood sugar.


Q: What makes Diaglucon different from older medicines for the same condition?

Official documents describe properties of Diaglucon that go beyond its main function of lowering blood sugar. These properties include antioxidant effects and a specific impact on microvascular health, as described in regulatory documents.


Q: Is it normal to feel a change in appetite after starting Diaglucon?

Regulatory documents report that common or uncommon gastrointestinal side effects may occur, including nausea, indigestion, and abdominal pain. Although a change in appetite itself is not explicitly listed, these related side effects are a possibility that may be experienced during treatment.


Q: Is Diaglucon safe for people with a history of digestive issues?

The regulatory label notes that gastrointestinal side effects may occur, and it explicitly lists severe liver or kidney problems as contraindications (reasons the drug must not be used). Official documentation generally does not provide specific safety guidance for all pre-existing digestive conditions.


Q: Does Diaglucon cause weight changes?

The adverse event profile documented in regulatory sources includes reports of weight gain associated with the use of this medicine.


Q: Can Diaglucon affect my ability to drive or operate machinery?

Regulatory documents contain a warning that symptoms of low blood sugar, known as hypoglycemia, can occur with this medicine. Hypoglycemia may impair concentration and your ability to react. The official label warns about the risk of impairment to driving or using machinery.


Q: Why do some people say Diaglucon makes them feel tired?

While the term 'tired' may not be used directly in the official safety profile, regulatory data lists asthenia (a medical term for lack of energy or physical weakness) and dizziness as documented side effects. These effects may be perceived as a general feeling of tiredness.


Q: Is Diaglucon safe for women who might become pregnant?

Regulatory documents contain explicit guidance stating that the use of this medicine during pregnancy is generally not recommended. Any individual who is pregnant or planning to become pregnant is advised to consult a healthcare professional for guidance regarding the use of this medication.


Q: Are there any known interactions between Diaglucon and cold/flu medicines?

Official regulatory documents caution about combining Diaglucon with certain drug classes that have opposing effects on blood sugar. This includes agents like glucocorticoids, which can sometimes be found in certain common cold and flu preparations. These interactions could potentially lead to high blood sugar.


Q: Does taking Diaglucon increase the risk of infections?

The official safety profile reports rare but serious changes in blood cell counts, such as agranulocytosis. These serious changes in the blood system are associated with an increased risk of infection.


Q: What kind of monitoring (like blood tests) is generally done while taking Diaglucon?

Regulatory labels detail the need for routine monitoring during treatment, which includes checking blood glucose levels, blood cell counts, and liver function. The purpose of this monitoring is to track the drug’s effects and detect rare, serious side effects.


Q: Can men using Diaglucon have fertility issues mentioned in research?

Regulatory documents have a dedicated section addressing fertility. For this medicine, the official label reports no specific data or findings regarding adverse effects on male fertility.

How should Diaglucon be stored and disposed of?

Diaglucon (Gliclazide) must be stored and disposed of according to labeled regulatory requirements to preserve the medicine's quality.

Storage Requirements

Classification Requirement
Temperature Store below 25^circmathrmC or 30^circmathrmC (regional variation).
Protection Protect from light and moisture. Store in a dry place.
Packaging Keep the tablets in the original package and the blister in the outer carton.
Child Safety Keep this medicine out of the sight and reach of children.

The medicine must not be used after the expiry date printed on the packaging.

Disposal Instructions

The product must not be thrown away via wastewater or household waste. All unused or expired tablets must be disposed of in accordance with local regulatory requirements to prevent environmental contamination. Consult a pharmacist for guidance on local take-back programs.

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

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