Gliclada

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Gliclada

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Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Gliclada

What is Gliclada? Overview

Property Description
Active ingredient Gliclazide (C15H21N3O3S)
Form Oral Tablet (Modified-Release)
Pharmacological class Sulfonylurea (Second-Generation)
General purpose Systemic Glucose Control
Origin Synthetic Compound

Defining Gliclada: A Second-Generation Antidiabetic Agent

Gliclada is an oral, prescription-only medication whose active component is the synthetic compound Gliclazide. It is formally classified as a sulfonylurea, specifically a second-generation agent, belonging to the group of oral hypoglycemic agents known as insulin secretagogues. The primary function of Gliclada is systemic glucose control, assisting the body in lowering and regulating blood glucose concentration.

Pharmacological properties of Gliclazide focus on its efficacy in diabetes care, specifically its role in the reduction of elevated blood sugar levels. The substance is used as an option for sustained glucose management, intended to support consistent sugar control over time.

Composition and Physical Form

Gliclada is a single-entity product dispensed as an oral tablet with a specialized modified-release (MR) formulation. This controlled-release design is a key feature, influencing the drug's delivery profile to ensure its action is both prolonged and steady.

The sustained-release formulation utilizes a specialized solid oral dosage base to release the Gliclazide gradually. This continuous delivery profile is engineered specifically to support consistent therapeutic effects throughout a typical 24-hour cycle. The oral administration route is a foundational component for many adult patients requiring long-term glucose management.

How Gliclazide Works at a High Level

Gliclazide's action is that of an insulin secretagogue, meaning it works primarily by acting directly on the pancreatic β-cells. Through a specific binding action, Gliclazide prompts these cells to stimulate insulin secretion. This enhanced and regulated release of the body's natural insulin is the core principle by which the medicine achieves its general purpose of effective glucose control and stability.

What side effects are possible with Gliclada?

Possible Side Effects and Safety Information

The safety profile of Gliclada is defined by the official classifications of its documented adverse reactions and the constraints related to its use. As a sulfonylurea, the most significant and most frequently documented adverse reaction is hypoglycaemia (low blood sugar), which is classified as common in regulatory documents.

Frequency and System-Organ Classifications

Adverse effects are categorized by the body systems they affect, according to regulatory standards (System-Organ Classes, or SOCs). Effects on the Metabolism and Nutrition Disorders SOC (hypoglycaemia) are primary. Other effects, typically classified as uncommon, involve Gastrointestinal Disorders (e.g., abdominal pain, nausea, vomiting, diarrhoea) and Skin and Subcutaneous Tissue Disorders (e.g., rash, itching).

Serious Adverse Reactions and Safety Constraints

The regulatory profile highlights rare but clinically significant serious adverse reactions. These include severe forms of hypoglycaemia and rare instances of serious organ impairment, such as severe hepatic insufficiency (hepatitis) and rare, severe generalized bullous skin reactions (e.g., Stevens-Johnson syndrome).

Safety limitations are also explicitly documented. Use of Gliclada is formally restricted (contraindicated) in patients with pre-existing conditions such as severe renal or hepatic impairment, and in those with Type 1 diabetes or diabetic ketoacidosis.

Furthermore, the label notes time-related patterns, such as transient visual disturbances that may occur at the start of treatment due to changes in blood glucose levels.

Overdose and Emergency Response

Overdose with Gliclada (Gliclazide) primarily results in severe and prolonged hypoglycaemia (critically low blood sugar), which constitutes a potential medical emergency as defined by regulatory authorities. The official overdose profile is strictly defined by the clinical consequences of this metabolic event.

Documented Overdose Presentations

Domain Official Regulatory Statement
Documented overdose presentations: Overdose manifests as severe and prolonged hypoglycaemia, presenting with symptoms such as sweating, tachycardia (rapid heartbeat), dizziness, anxiety, confusion, poor concentration, headache, and tremor.
Physiological systems affected: Metabolic System, Central Nervous System (CNS), and the Cardiovascular System (adrenergic counter-regulation).
Population-specific overdose notes: Patients with severe renal or hepatic insufficiency and the elderly are explicitly noted to be at an enhanced risk for severe and prolonged reactions. Ingestion of even a single tablet can cause life-threatening hypoglycemia in young children.

When Immediate Medical Help is Required

Classification Aspect Official Regulatory Statement
Severity classification: Can lead to life-threatening neurological impairment, including coma and convulsions (seizures).
When help is required (label phrasing): Immediate medical treatment or hospitalisation is required if the hypoglycaemic episode is determined to be severe or prolonged. Urgent medical assistance is needed if the patient is unconscious or cannot be awakened.
Monitoring requirements: Management requires administering intravenous dextrose (glucose) and initiating close monitoring for recurrence. Hospital monitoring may need to be continued for several days until the patient is out of danger.

Connection to the overall overdose profile

Regulatory documents define the Gliclada overdose profile solely through the expected consequences of excessive lowering of blood glucose, centering on the onset of severe, recurrent, and prolonged hypoglycaemia. This metabolic state forms the basis for all emergency guidance, which strictly mandates urgent clinical intervention and extended hospital monitoring to mitigate the established risk of subsequent severe neurological impairment or death.

Therapeutic Uses of Gliclada

Gliclada (Gliclazide) Main Uses and Benefits

Gliclada is an approved prescription medication utilized in the management of Type 2 Diabetes Mellitus in adults. The drug is generally considered as an adjunct to non-pharmacologic interventions, such as appropriate dietary measures, physical activity, and weight management, when these lifestyle-based strategies alone are not adequate to establish satisfactory glycemic control.

The primary therapeutic purpose of Gliclada is to support the body in regulating blood sugar levels. It is typically reserved for individuals whose bodies retain the capacity to produce some natural insulin. The use of this agent is part of a comprehensive strategy to improve the regulation of blood sugar and support the maintenance of target glucose values over time. Appropriate regulation of blood sugar is a significant component in the overall management of Type 2 Diabetes Mellitus.


Quick Facts on Gliclada Uses

  • Condition addressed: Type 2 Diabetes Mellitus in adults.
  • Therapeutic goal: To improve glycemic control when diet and exercise are not sufficient.
  • Main benefit: Supports the regulation of high blood sugar (hyperglycemia) as part of an overall diabetes management plan.

Eligibility and Restrictions for Use

Who Can and Cannot Use Gliclada?

This section outlines the official population eligibility and non-eligibility for Gliclada (Gliclazide) as defined in regulatory documents. Use is indicated only for adults with Type 2 Diabetes Mellitus that is not adequately controlled by diet and exercise alone.


Regulatory Status Affected Population or Condition
Contraindicated Type 1 Diabetes Mellitus; Diabetic Keto-acidosis or Diabetic Coma/Pre-coma; Severe Hepatic or Renal Insufficiency/Failure; known Hypersensitivity to Gliclazide, other sulfonylureas, or sulfonamides [Source 1.1, 4.2].
Contraindicated Women who are pregnant or breastfeeding/lactating [Source 1.1, 4.2].
Not Recommended Children and adolescents (mathbf< 18 years of age), as the safety and efficacy of the medicine have not been established in this age group [Source 4.1, 4.2].
Conditional Use Patients with mild to moderate renal impairment (requires careful patient monitoring) and patients at risk of hypoglycemia due to undernourishment or irregular mealtimes [Source 1.1, 4.2].

The regulatory profile strictly prohibits use in cases of severe organ failure and acute diabetic complications. Eligibility is restricted to the adult population, with the safety and efficacy data explicitly not established for pediatric use [Source 4.1, 4.2].

What should I know about interactions with other medicines?

Gliclada Interactions with other medicines and products

Interactions involving Gliclada, whose active ingredient is Gliclazide, are formally documented in regulatory sources and classified by their effect on blood glucose concentration or drug exposure.

Documented Pharmacodynamic Interactions

Interactions are grouped into those that potentiate or reduce the blood glucose-lowering action:

  • Potentiation (Increased Hypoglycemic Effect): This outcome is documented when Gliclazide is co-administered with substances such as other antidiabetic agents, certain NSAIDs, ACE inhibitors, beta-blockers, H2-receptor antagonists, MAOIs, and the antifungal Fluconazole. These combinations increase the formal risk of hypoglycemia.
  • Reduction (Increased Hyperglycemic Effect): Agents documented to lessen the effect include Glucocorticoids, Thiazide diuretics, the neuroleptic Chlorpromazine (in high doses), and Danazol. These interactions may compromise glycemic control.

Exposure and Substance Restrictions

Classification Substance Official Regulatory Restriction
Contraindicated Combination Miconazole (systemic) Strictly prohibited due to risk of severe hypoglycemia.
Substance Restriction Alcohol (ethanol) Must be avoided as it formally increases the hypoglycaemic reaction.
Exposure Modification St John's Wort Documented to formally decrease Gliclazide exposure.

The systemic administration of Phenylbutazone is documented to increase Gliclazide exposure by reducing its elimination or displacing its plasma protein binding. Furthermore, the co-administration of Fluoroquinolones carries a population-specific note regarding the risk of dysglycaemia, particularly in elderly patients.

Mechanism of Action

beta-Cell Insulin Release and K ATP Channel Regulation

Gliclada (gliclazide) acts primarily by binding to the sulfonylurea receptor 1 (SUR1) subunit of the ATP-sensitive potassium channels ( K ATP) located on the plasma membrane of pancreatic beta-cells. This binding event causes the K ATP channels to close, which prevents the efflux of potassium ions ( K^+). The resulting retention of positive charge causes the beta-cell membrane to depolarize. Depolarization subsequently activates voltage-dependent calcium channels, allowing extracellular calcium ions ( Ca^2+) to influx into the cell. The rise in intracellular Ca^2+ concentration acts as a final signal to directly trigger the exocytosis of stored insulin granules; this is the physiological consequence of the beta-cell signaling cascade.


Modulating Extrapancreatic Cellular Pathways

Beyond its core action in the pancreas, Gliclada influences other relevant mechanistic domains, particularly those involving oxidative signaling and vascular function. The drug is associated with effects that modulate processes influenced by reactive oxygen species. This activity within extrapancreatic cellular pathways involves modulation of cellular activity and signaling pathways.

Dosage and Administration Information

Gliclada is an oral medication administered as a modified-release tablet for long-term systemic glucose management. The standard use procedure mandates a single daily dose to be taken with breakfast. This strict association with the first main meal is a key procedural requirement, and the medication should only be administered if the patient is likely to maintain a regular food intake. Due to the specialized formulation, the tablet must be swallowed whole with water and must not be crushed or chewed.

The dosing regimen is standardized, beginning with an initial daily dose of 30 mg. The daily dose may be adjusted based on metabolic response, ranging from the starting dose up to a maximum recommended daily intake of 120 mg. Dose increases are typically incremental and should respect an interval of at least one month between each adjustment, though this period may be shortened to two weeks if blood glucose has not been adequately reduced.

Administration for specific populations remains consistent with the general adult guidelines. For both older adults (over 65 years) and patients with mild to moderate renal impairment, the recommended initial dose of 30 mg is identical to that for the general adult population. Furthermore, if a dose is accidentally forgotten, the official instruction is that the patient must not increase the dose taken on the subsequent day to compensate. Use in the pediatric population has not been established.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Gliclada


Evidence for use in Type 2 Diabetes Mellitus

Gliclada was studied for its use in patients with Type 2 Diabetes Mellitus, a condition marked by outcomes related to systemic or functional imbalance. Randomized Controlled Trials (RCTs) were the main study type used for this indication. These studies monitored outcomes like glycated hemoglobin ( HbA1 c) and fasting glucose levels, and also tracked body weight measurements.

Studies report how symptoms evolved in the observed populations, where studies reported measurements of decreased HbA1 c values over the observed study periods when compared to control groups or baseline measurements. However, follow-up durations were limited in many core studies, and certainty remains low regarding the consistency of these reported changes over periods exceeding one year.


Evidence for use in Cardiovascular Risk Reduction

Large-scale, dedicated Cardiovascular Outcome Trials (CVOTs) were evaluated in high-risk adults with Type 2 Diabetes. The trials explored outcomes describing episodic or acute changes, specifically tracking the rate of Major Adverse Cardiovascular Events ( MACE), including heart attack, stroke, and cardiovascular death.

The findings describe patterns observed in the studies where the occurrence of these major cardiovascular events was observed in some studies at a lower rate in the intervention groups over several years. The results apply only to the populations studied, which were high-risk individuals often already receiving other standard cardiovascular medications. Limited information is available regarding the specific contribution of the intervention when compared to existing standard-of-care treatments.


What is still uncertain about Gliclada

Certainty remains low in several aspects of the research. For HbA1 c outcomes, research often relies on laboratory measurements, and the full clinical relevance of these short-term changes is not fully established. Subgroup findings are uncertain for many specific patient groups, and limited information is available for children, adolescents, or pregnant individuals. The research does not determine whether an individual will respond similarly to the group patterns observed in the studies.

Frequently Asked Questions (FAQ)

Common questions about Gliclada (FAQ)

Q: What are the typical symptoms of hypoglycemia that people taking Gliclada should know?

A: Regulatory documents state that low blood sugar (hypoglycemia) can present with symptoms such as dizziness, sweating, trembling, hunger, and confusion. Since hypoglycemia is the most frequently documented side effect of Gliclada, the recognition of these signs, including a fast heartbeat and unusual tiredness, is typically considered essential for individuals using the medication.

Q: Is Gliclada associated with skin reactions or increased sun sensitivity?

A: Official product information notes that skin reactions like rash and itching have been reported. Additionally, increased skin sensitivity to sun (photosensitivity) is also documented as a possibility when taking this medication.

Q: Is it safe to drive or operate machinery while taking Gliclada?

A: Official safety warnings indicate that Gliclada can cause low blood sugar, which may lead to symptoms like reduced alertness or dizziness. Due to the potential for low blood sugar, activities such as driving or operating heavy machinery may need to be avoided until the individual is aware of how the medicine affects their alertness.

Q: Does Gliclada have known interactions with common high blood pressure medications?

A: Yes, official documents state that interactions are documented with certain classes of high blood pressure medicines. Specifically, ACE inhibitors and beta-blockers are described as potentially potentiating (increasing) the blood glucose-lowering action, which raises the formal risk of low blood sugar.

Q: What are the research themes concerning Gliclada's long-term safety profile?

A: Long-term research has focused on important areas such as the occurrence of Major Adverse Cardiovascular Events (MACE), including heart attack and stroke. Some non-clinical studies explore antioxidant properties and their relationship to pancreatic cell function, which is cited as a theme of ongoing research.

Q: What are the signs of liver issues that a person taking Gliclada should watch for?

A: The regulatory profile highlights that severe liver impairment, such as hepatitis, is a rare but serious adverse reaction. Patient safety warnings list symptoms to be aware of, which include yellowing of the skin or eyes (jaundice), dark urine, and severe abdominal pain.

Q: What is the connection between Gliclada and the risk of cardiovascular issues?

A: Dedicated Cardiovascular Outcome Trials (CVOTs) have evaluated the drug in high-risk patients with Type 2 Diabetes. The findings describe patterns where the occurrence of major cardiovascular events was observed at a lower rate in the Gliclada groups over several years, specifically in the high-risk populations studied.

Q: Do studies suggest Gliclada has any effects beyond just blood sugar control?

A: Official data confirms Gliclada has actions beyond the pancreas. The drug is associated with extrapancreatic effects, including a potential reduction in hepatic glucose production by the liver and increased sensitivity to the body's own insulin. It also exhibits haemovascular properties, such as anti-oxidant actions and partial inhibition of platelet aggregation.

Q: Is Gliclada considered an oral insulin or a different type of medicine?

A: Gliclada is not insulin. It is an oral hypoglycemic agent classified as a sulfonylurea, which is also known as an insulin secretagogue. Its core function is to work on the pancreatic beta-cells to stimulate the body's natural release of insulin.

Q: How does Gliclada differ from other sulfonylurea medicines?

A: Gliclazide is classified as a second-generation sulfonylurea. Studies indicate that its binding to the KATP channels on the pancreas is rapidly reversible and it has a low affinity for cardiac KATP channels, which differs from some other medicines in its class. Clinical studies have also shown it to be associated with fewer confirmed episodes of hypoglycemia compared to glimepiride.

Q: Does Gliclada cause weight gain, and if so, how is this addressed in official literature?

A: Official adverse reaction data acknowledges that weight gain is a potential side effect associated with Gliclazide. This is a possibility recognized in the regulatory profile, similar to other medications belonging to the sulfonylurea class.

Q: How long does it usually take for Gliclada to start affecting blood sugar levels?

A: Due to its modified-release (MR) formulation, the medicine is designed to release the active ingredient progressively over several hours. This design allows it to provide effective concentrations for blood sugar management over a 24-hour period after a single daily dose.

Q: Does Gliclada cause any long-term damage or 'wear out' the pancreas?

A: Official information confirms Gliclada stimulates insulin release from pancreatic beta-cells. Some research has explored the drug's documented anti-oxidant properties and their relationship to beta-cell survival from oxidative stress, a theme noted in non-clinical studies.

Q: Can Gliclada be taken alongside other common diabetes medications?

A: Official documents state that Gliclazide can be used in combination with other antidiabetic medicines. Due to the combined effects, a lower dose of the additional agent may be required to help manage the risk of low blood sugar.

Q: Are there any known interactions between Gliclada and non-prescription or herbal supplements?

A: Yes, official regulatory documents note that the herbal supplement St John’s Wort is documented to formally decrease Gliclazide exposure. Furthermore, other non-prescription substances, such as certain NSAIDs (Nonsteroidal Anti-inflammatory Drugs), are documented to potentiate the blood glucose-lowering effect.

Q: Are there specific food types or dietary habits that can affect Gliclada?

A: Official warnings emphasize that the treatment should only be prescribed if the patient is likely to maintain a regular food intake, including breakfast. The risk of low blood sugar is increased if a meal is taken late, if an inadequate amount of food is consumed, or if the food is described as being low in carbohydrate.

Q: Is Gliclada a standard first-line treatment for Type 2 diabetes?

A: Gliclada is indicated for use in adults with Type 2 diabetes when their condition is not adequately controlled by diet and exercise alone. In clinical settings, it is often utilized following or in combination with medications like Metformin.

Q: Why is Gliclada sometimes combined with Metformin?

A: Gliclazide is often used in combination with Metformin to achieve better glucose control because they address Type 2 diabetes through different mechanisms of action. This combination is available in some markets as a fixed-dose tablet.

Q: Is the risk of hypoglycemia lower with Gliclada compared to older sulfonylureas?

A: Official clinical studies have investigated the risk of low blood sugar compared to other drugs in the same class. One major study found Gliclazide to be associated with approximately 50% fewer confirmed episodes of hypoglycemia when compared with glimepiride.

Q: Can Gliclada be taken before or during a planned surgery?

A: Official safety guidelines recommend that for elective surgery, the morning dose is typically omitted and the medicine may need to be discontinued depending on the length of the fasting period. Insulin administration is sometimes used as a substitute for Gliclada during major surgical stress or restricted food intake periods.

Q: Is Gliclada effective for managing blood sugar spikes after meals?

A: Yes, regulatory information states that Gliclazide acts to restore the first peak of insulin secretion in response to glucose, and significantly increases insulin release following stimulation by a meal. This action specifically supports the control of post-meal (postprandial) blood glucose levels.

Q: How is Gliclada described in official research regarding its durability of effect?

A: Studies on Gliclazide's effects on insulin release have shown that the increased secretion persists after two years of treatment. However, official documents also note that certainty remains low regarding the consistency of these changes over periods exceeding one year.

Q: Do people typically experience mood changes or mental fog while taking Gliclada?

A: Official safety information indicates that mood changes, mental fog, and confusion are recognized symptoms of hypoglycemia (low blood sugar), which is a common side effect of the medicine. Drowsiness is also a reported symptom.

Q: Does Gliclada affect or interact with birth control pills?

A: Certain hormonal agents, including contraceptive pills, are documented in regulatory sources to potentially reduce the blood glucose-lowering effect of Gliclazide. This interaction may, in rare cases, require a small adjustment in the Gliclada dose to maintain glycemic control.

Q: Is it true that Gliclada works better for some patient groups than others?

A: The regulatory research overview notes that official evidence does not determine whether an individual will respond similarly to the group patterns observed in studies. Furthermore, subgroup findings are uncertain for many specific patient groups.

Q: Can Gliclada be used to treat diabetes caused by steroid medication?

A: Official information indicates that Glucocorticoids (steroids) are documented to reduce the blood glucose-lowering action of Gliclazide. This interaction is noted because the use of steroids may lessen the hypoglycemic effect and compromise overall glycemic control.

Q: Why might a doctor prescribe Gliclada over another similar diabetes drug?

A: Gliclada's clinical profile, as described in regulatory documents, includes a documented lower risk of hypoglycemia compared to some other medicines in its class. Additionally, it possesses extrapancreatic and haemovascular properties that may be factors considered in treatment selection.

Q: Are there any known genetic factors that affect how Gliclada works?

A: Official pharmacokinetic data indicates that Gliclazide is mainly metabolized (broken down) in the liver. The processing of Gliclada is noted to be influenced by genetic variations related to the CYP2C19 enzyme.

Q: Does taking Gliclada require changes to exercise routines or activity levels?

A: Official safety warnings state that regular exercise is important in the management of diabetes. However, low blood sugar is noted to be more likely following prolonged or strenuous physical exercise.

How should Gliclada be stored and disposed of?

Gliclada modified-release tablets do not require any special storage conditions in terms of specific temperature, light, or moisture protection, according to regulatory documentation. The product labeling indicates that standard ambient storage is appropriate. The medicine must not be used past the expiry date printed on the carton and blister, and it must be kept out of the sight and reach of children.

Disposal Requirements

For disposal, the product must not be thrown away via household waste or wastewater to protect the environment. Any unused medicinal product or associated waste material should be disposed of in accordance with local requirements, typically by consulting a pharmacist for guidance on authorized take-back programs.

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

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