Diacron

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Medically reviewed

Laura Arias

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 Diacron

What is Diacron? Identity and Foundation

Diacron is a prescription-only medicine that provides a foundational strategy for the chronic management of Type 2 Diabetes Mellitus, an important chronic metabolic disorder. It is an effective Hypoglycemic Agent for the treatment of this condition.

Quick Facts Description
Active ingredient Gliclazide
Form Tablet or modified-release tablet
Pharmacological class Oral Antidiabetic Agent, Sulfonylurea derivative
Common use Management of hyperglycemia
Origin Synthetic compound

Defining Diacron: Classification and Active Ingredient

Diacron is the commercial designation for a medicinal product whose active ingredient is Gliclazide, an Oral Antidiabetic Agent. The substance is structurally classified as a sulfonylurea derivative, specifically characterized as a second-generation sulfonylurea derivative, distinguishing it from earlier compounds in this therapeutic class. Its profile is characterized by its action on pancreatic function, which is a key characteristic of its class. The core utility of Gliclazide is its systemic action to help lower and maintain stable blood glucose levels.

Compositional Profile: Synthetic Origin and Oral Form Differentiation

The medication is a single active ingredient product, relying entirely on the function of the Gliclazide substance, which is a pure synthetic compound. As a pharmaceutical preparation, it is typically formulated as an oral preparation, commonly supplied as a tablet or a modified-release tablet. The design of the modified-release tablet is particularly relevant for chronic management, as it allows the gradual release of the Gliclazide substance following oral administration. As a hypoglycemic agent, it supports the long-term metabolic control of adults with Type 2 Diabetes. The emphasis on the modified-release formulation differentiates it from simple immediate-release preparations by supporting consistent blood glucose lowering drug activity throughout the day.

General Purpose: Managing Hyperglycemia

The primary purpose of Diacron is to serve as an effective tool in controlling hyperglycemia in adults with Type 2 Diabetes Mellitus (Non-Insulin-Dependent Diabetes Mellitus, or NIDDM). It achieves this general benefit by stimulating the specialized cells in the pancreas, known as the pancreatic beta-cells, which subsequently triggers an essential increase in insulin secretion. This action addresses the challenge of managing elevated blood sugar, supporting the long-term metabolic health of patients managing this condition, such as those requiring daily systemic support to prevent high blood sugar spikes.

What side effects are possible with Diacron?

Possible Side Effects and Safety Information

The safety profile of Diacron (Gliclazide), a sulfonylurea derivative, is defined by adverse reactions classified by frequency and the organ system affected, as documented in regulatory sources.

Frequency and System Classification

Consistent with its pharmacological class, the most frequent adverse reaction is hypoglycaemia (low blood sugar), which is officially classified as a common event. Other common adverse reactions primarily affect the Gastrointestinal System, including abdominal pain, nausea, vomiting, diarrhoea, and constipation. Reactions involving the Skin and Subcutaneous Tissue are also reported, such as rash and pruritus.

Classification Representative Adverse Reaction
Common Hypoglycaemia, Gastrointestinal disturbances
Rare Blood disorders (e.g., leucopenia), Severe bullous reactions

Serious Adverse Reactions and Constraints

Regulatory documents list several serious adverse reactions, including severe and prolonged hypoglycaemia. Rare but clinically significant reactions involving the liver (hepatitis and cholestatic jaundice) and the skin (e.g., Stevens-Johnson syndrome) are also documented. Certain effects, such as transient visual disturbances, may occur especially on initiation of treatment due to fluctuations in blood glucose levels.

Use of Diacron is contraindicated in specific conditions, including Type 1 diabetes, diabetic keto-acidosis, and in patients with severe hepatic or renal impairment. The drug is also officially contraindicated during pregnancy and lactation.

Overdose and Emergency Response

Overdose of Diacron (Gliclazide) is officially documented to result primarily in severe and protracted hypoglycemia, which is the critical manifestation requiring emergency medical intervention. The potential for a sustained drop in blood glucose levels is a key characteristic noted in regulatory information, especially with modified-release formulations.

Manifestations of overdose may include autonomic symptoms such as sweating, pallor, tachycardia, and tremor, alongside neuroglycopenic effects like confusion, agitation, dizziness, and headache. Should hypoglycemia become severe and uncorrected, regulators state that this condition can escalate to life-threatening outcomes, including convulsions and coma.

When to Seek Immediate Medical Attention

Condition Required Action (as mandated by regulators)
Any suspected overdose or symptomatic hypoglycemia Seek immediate medical attention and contact emergency services without delay.
Severe neurological signs (e.g., loss of consciousness, seizures) Emergency hospitalization is necessary.

Official Management and Monitoring

Management documented in official prescribing information is symptomatic and supportive treatment. The specific intervention for correcting low blood glucose is the administration of intravenous glucose. Due to the high risk of recurrent hypoglycemia, particularly in the elderly or those with impaired kidney or liver function, regulators mandate a prolonged observation period—often 24 hours or longer—in a hospital setting.

Therapeutic Uses of Diacron

What Diacron Treats: Main Uses and Benefits

Diacron (Gliclazide) is applied as a foundational strategy for the long-term management of Type 2 Diabetes Mellitus (T2DM) in adults. It is used across domains where additional symptomatic support is needed when the disorder, a chronic metabolic imbalance, is not adequately managed by lifestyle measures alone. Its use assists with supporting consistent management of the patient's metabolic status. The medication is considered relevant for easing symptom-driven clinical presentations caused by elevated glucose.

The main symptomatic benefit is that it plays a role in supporting the consistent management of chronic hyperglycemia, which involves addressing persistently high fasting and postprandial blood glucose levels. This helps address symptoms related to systemic imbalance that interfere with daily functioning. By providing supportive relief when symptoms become more noticeable, it contributes to easing the overall symptom load and supports patients during episodes of heightened discomfort.

Consistent management of blood sugar plays an important role in helping to reduce the long-term risk of severe microvascular and macrovascular complications associated with T2DM.

Quick Fact Relief for Symptom
Main Use Management of chronic metabolic disorder (T2DM)
Benefit Focus Assists with managing blood glucose levels
Symptom Domain Symptoms related to systemic imbalance (Hyperglycemia)

Eligibility and Restrictions for Use

Diacron is officially approved for use exclusively in adults managing Type 2 Diabetes Mellitus whose condition is not adequately controlled by diet and exercise alone. Older adults (ge 65 years) can use the medicine with the same regimen as younger adults.

The medicine is contraindicated and must not be used by patients with Type 1 Diabetes Mellitus or acute metabolic complications such as diabetic keto-acidosis or diabetic pre-coma. Absolute non-eligibility also applies to individuals with a known hypersensitivity to Gliclazide or related sulfonamides/sulfonylureas, or those receiving concomitant treatment with Miconazole.

Use is prohibited based on physiological and organ constraints. Diacron is contraindicated during pregnancy and lactation/breastfeeding. Furthermore, it must not be used by patients diagnosed with Severe Hepatic Insufficiency or Severe Renal Insufficiency. The medicine’s safety and efficacy are not established in the pediatric population (children and adolescents), rendering them ineligible. Patients with Mild to Moderate Renal Insufficiency require cautious use and careful monitoring.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents detail specific drug–drug, drug–substance, and drug–herbal interactions for Diacron (Gliclazide). The most significant constraint is the contraindication of co-administration with Miconazole (systemic or oromucosal gel), which is strictly prohibited due to the risk of severe, potentiated hypoglycemia.

Pharmacodynamic and Pharmacokinetic Constraints

Interactions are categorized by their effect on blood sugar or drug exposure. Substances that increase the risk of hypoglycemia via potentiation include other Antidiabetic Agents, Beta-blockers, ACE inhibitors, Fluconazole, and Clarithromycin. The combination with Phenylbutazone is not recommended because it increases Gliclazide plasma levels by displacing it from plasma protein binding.

Conversely, agents that may reduce the glucose-lowering effect include Danazol (combination not recommended), Glucocorticoids, and high-dose Chlorpromazine.

Substances and Specific Populations

Alcohol must be avoided as acute intake significantly increases the hypoglycaemic reaction risk. Similarly, St John's Wort preparations decrease Gliclazide exposure due to increased metabolism, risking a loss of blood glucose control. In elderly patients, careful monitoring is noted during concomitant use with Fluoroquinolones due to documented disturbances in blood glucose levels.

Mechanism of Action

How Diacron Works

Ion Channel Blockade and Cellular Depolarization

The primary mechanism involves the direct interaction of Gliclazide with the Sulfonylurea Receptor 1 ( SUR1), a specific component of the ATP-sensitive potassium channel ( K ATP channel) on the pancreatic beta-cell. This binding forces the closure of the channel, blocking the outflow of potassium ions ( K^+) and causing the cell membrane to depolarize.

️ Ca^2+ Dependent Hormone Secretion Cascade

The resulting cellular depolarization immediately opens voltage-dependent L-type Ca^2+ channels, allowing a rush of calcium ions ( Ca^2+) into the beta-cell. This sudden increase in intracellular Ca^2+ concentration triggers the final step of the secretory cascade, leading to an increase in endogenous insulin secretion.

Influence on Systemic Glucose Dynamics

The increase in circulating insulin acts as the physiological mediator, influencing organs such as the liver and peripheral tissues. By facilitating glucose uptake into these tissues and suppressing the liver's natural production and release of glucose, the mechanism results in enhanced glucose uptake by peripheral tissues and suppression of hepatic glucose output. This cascade is entirely dependent on the presence of viable, functional beta-cells.

Dosage and Administration Information

Diacron (Gliclazide modified-release) is strictly administered for oral use only. The official instructions define a standardized, once-daily regimen tailored for long-term metabolic management. The medication is available as a modified-release tablet in strengths such as 30 mg and 60 mg. The structural integrity of the tablet is essential for its function; therefore, it must be swallowed whole without being crushed or chewed.


Dosing and Schedule

The initial starting dose is 30 mg taken once daily. The labeled maintenance dose range is between 30 mg and 120 mg daily, with a maximum recommended daily dose of 120 mg. The dose is administered as a single intake at breakfast time, and must always be consumed alongside a regular food intake.

Dose adjustments are procedural, generally requiring an interval of at least 1 month between successive increments to assess the metabolic response.


Procedural Conditions

Administration rules apply to specific populations and usage scenarios. For older adults, the treatment protocol remains the same, but initiation should always start with the minimum daily dose of 30 mg. The standard regimen is also applicable for patients with mild to moderate renal insufficiency. Usage is not supported for the pediatric population.

In the event of a forgotten dose, the patient should not attempt to compensate by taking a double dose on the subsequent day; the regular schedule must be maintained. The entirety of the usage protocol is designed to ensure the continuous and proper systemic delivery required for chronic management.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Diacron


Evidence for Management of Type 2 Diabetes Mellitus

Research exploring Diacron (Gliclazide) has focused on studies conducted to evaluate its use in the management of Type 2 Diabetes Mellitus (T2DM). The evidence base includes many Randomized Controlled Trials (RCTs) that have compared the effects of Diacron against placebo, against other treatments in its class (sulfonylureas), and against other types of oral diabetes medications. These studies typically apply in research contexts involving fluctuating or unstable symptoms of T2DM. Research explored the medication in monotherapy study settings and in combination regimens.

The primary focus of most studies was on Glycated Hemoglobin (HbA1c), a key marker monitored to show long-term blood sugar patterns over several months. Studies monitored and reported changes measured during the study period for both HbA1c and more immediate measures like Fasting Plasma Glucose and Postprandial Blood Glucose. These findings describe patterns observed in adult populations with T2DM.


Long-Term Studies and Vascular Outcome Trials

Large-scale, long-term clinical trials were conducted because T2DM is a chronic condition where long-term outcomes related to organ and vascular health are examined. These trials followed groups of patients for five years or more to study outcomes related to physical discomfort and systemic imbalance that define T2DM.

The primary objective of these extended-duration studies was to examine the frequency of clinical events, categorized as macrovascular outcomes (such as stroke or heart attack) and microvascular outcomes (such as new or worsening kidney disease). Studies examined the relationship between observed changes in blood sugar markers and the occurrence of microvascular outcomes, particularly those affecting the kidneys.


Evidence Quality, Consistency, and Research Gaps

The overall level of evidence is consistent with authoritative findings for the evaluation of Diacron's effect on glycemic markers in T2DM adults, primarily based on the large number of existing RCTs and meta-analyses. This consistency applies mostly to short- to intermediate-term outcomes related to HbA1c measurements.

Despite this, several research limitations exist. One key limitation is that comparative evidence is lacking for the effects of Diacron against the newest classes of diabetes medications (such as SGLT-2 inhibitors or GLP-1 receptor agonists) in terms of long-term macrovascular and microvascular outcomes. Furthermore, evidence quality varies across studies, and some older trials had small sample sizes or limited follow-up durations.

Key Studies & References

  1. Antidiabetic drugs and kidney disease (Includes evidence on Gliclazide use in renal impairment)

Frequently Asked Questions (FAQ)

Common questions about Diacron (FAQ)


Q: Is Diacron used for any conditions besides the main one listed?

Regulatory documents state that Diacron, which contains Gliclazide, is officially indicated only as a treatment to improve blood sugar control in adults who have Type 2 Diabetes Mellitus. It is intended to be used alongside diet and exercise. Official product information does not list any other approved uses.


Q: How long do the effects of Diacron last after taking a dose?

Diacron is formulated as a modified-release tablet, which is designed to provide blood sugar control over an extended period. The half-life and release properties of Gliclazide in this formulation support a 24-hour duration of action, making it suitable for a once-daily dosing regimen.


Q: Is Diacron similar to [Name of another drug]?

Diacron is the brand name for the active substance Gliclazide, which belongs to a class of medicines called sulfonylurea derivatives. These medicines work by stimulating the beta cells in the pancreas to release more insulin. Official sources classify it alongside other drugs that share this same mechanism of action.


Q: Can Diacron affect a person's ability to drive or operate machinery?

Official safety information advises caution because Gliclazide works to lower blood sugar and can cause a condition called hypoglycemia (low blood sugar). Symptoms of hypoglycemia can include dizziness and impaired concentration. Official product information states that if symptoms of low blood sugar occur, activities requiring mental alertness, such as driving or operating machinery, may be impaired.


Q: Is Diacron known to cause weight changes?

Gliclazide is part of the sulfonylurea drug class, which is generally associated with a potential for weight gain. Weight gain is a documented effect of this class of medicine, and patients should be aware of this possibility.


Q: Can Diacron be taken if a person has pre-existing heart problems?

Official documents do not list pre-existing heart problems as a strict contraindication for Gliclazide itself. However, because Gliclazide belongs to the sulfonylurea class, there have been historical warnings associated with a possible increased risk of cardiovascular mortality that may be noted in regulatory documents. The official product information notes that medical supervision is required during use.


Q: How is Diacron cleared from the body?

According to official pharmacokinetic data, Gliclazide is mainly metabolized (broken down) in the liver. The resulting inactive products of this metabolism are then primarily excreted through the urine. Less than one percent of the original drug is eliminated unchanged.


Q: Are there different brand names for the medicine Diacron?

Yes, Gliclazide, the active ingredient in Diacron, is marketed under various brand names globally, in addition to its generic name.


Q: What happens if Diacron is taken for longer than recommended?

Diacron is a medicine approved for the chronic, long-term management of Type 2 Diabetes Mellitus. Taking it for an extended period is the standard treatment approach. However, long-term management with Diacron is typically accompanied by regular clinical monitoring, which is intended to assess its continued effectiveness and safety.


Q: Is Diacron a controlled substance or scheduled drug?

Gliclazide is classified by health authorities as a prescription-only medicine (POM or Rx-only). However, it is not typically a scheduled controlled substance in major jurisdictions, meaning it does not have the same restrictions as opioids or certain sedatives.


Q: Can Diacron cause changes in sleep patterns?

While specific changes to sleep patterns are not a commonly highlighted side effect, Gliclazide's main action is to lower blood sugar. If blood sugar drops too low (hypoglycemia), symptoms can include drowsiness, confusion, or weakness, which could indirectly affect a person's sleep state or patterns.


Q: Is Diacron known to interact with birth control pills?

Yes, regulatory drug interaction information states that oral contraceptives (birth control pills containing estrogen or progestogen) may potentially cause an increase in blood sugar levels. Regulatory information notes that if these medicines are taken together, co-administration may reduce the effectiveness of Diacron, and therefore, blood sugar monitoring may be increased.


Q: What is the documented risk of developing tolerance to Diacron?

Official information acknowledges a risk known as secondary failure, where the medicine initially works well but gradually loses its ability to control blood sugar over time. This loss of effectiveness is a recognized possibility with all sulfonylurea medicines, including Gliclazide, and official guidelines indicate that ongoing monitoring is used to assess effectiveness.


Q: Is Diacron available as a generic medicine?

Yes, the active pharmaceutical ingredient, Gliclazide, is widely available in many countries as an approved generic medicine alongside the branded product Diacron.


Q: Does the efficacy of Diacron change over time?

Yes, regulatory documents mention that a reduction in efficacy is possible with continuous use over a long period. This is often referred to as secondary failure. This reduction in effectiveness may necessitate a medical reassessment of the treatment plan to maintain blood sugar control. To assess its continued effectiveness, medical check-ups are typically used to monitor blood sugar control.


Q: Is it safe to use Diacron before or after surgery?

During periods of physical stress, such as major surgery or serious infection, the need for blood sugar control changes significantly. Regulatory precautions note that during periods of stress, such as surgery or infection, a temporary change to insulin therapy may be medically necessary for closer blood glucose management.

How should Diacron be stored and disposed of?

Official Storage Requirements

DIAMICRON MR 60 mg modified-release tablets must be stored at a temperature below 30 C and kept in the original packaging.

This is necessary to protect the medicine from light and moisture, which helps maintain product stability. It is also a mandatory requirement that the product be stored out of the sight and reach of children.

Disposal Instructions

Regulatory agencies specify that any unused or expired DIAMICRON tablets must not be disposed of via wastewater or household waste.

Instead, patients are instructed to consult their pharmacist for guidance on the proper disposal methods, which ensures compliance with local requirements for pharmaceutical waste management and helps protect the environment.

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

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