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Glisulin XR

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Glisulin XR

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Treatment option:

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.

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Overview of Glisulin XR

This foundational section defines Glisulin XR by its identity, composition, and high-level classification, strictly excluding details on dosage, administration, or safety.

Property Description
Active ingredient Metformin hydrochloride
Form Oral tablet (Extended-Release/XR)
Pharmacological class Antidiabetic Agent (Biguanide)
Common use Managing high blood sugar in Type 2 diabetes
Origin Synthetic derivative

What Type of Medicine is Glisulin XR and What Does it Do?

Glisulin XR is a prescription-only medicine containing Metformin hydrochloride as its single active ingredient. It is classified pharmacologically as an antidiabetic agent belonging to the biguanide class. The drug is clinically recognized for its effectiveness as a first-line therapy in treating elevated blood sugar levels.

The primary general purpose of this medication is to facilitate effective chronic disease management by reducing the excess blood glucose associated with Type 2 diabetes mellitus. The compound is a synthetic derivative, and its established efficacy is widely supported by extensive pharmacological studies.


Glisulin XR Composition and Form: Metformin and Extended Release

The medication is an oral tablet distinguished by its XR suffix, which signifies a sustained-release formulation. It is composed of the Metformin hydrochloride integrated within pharmaceutical excipients designed to control the drug's release.

This extended-release design is the differentiating factor from standard, immediate-release Metformin. The formulation ensures the active ingredient is distributed and absorbed gradually over a prolonged action period, which provides a sustained level of the drug over 24 hours for consistent antihyperglycemic control.


How Glisulin XR Manages Blood Sugar at a High Level

The therapeutic effect of Glisulin XR is achieved through a dual-focus mechanism principle aimed at glucose regulation. The drug reduces the amount of glucose produced by the liver, a major contributing factor to high blood sugar.

Concurrently, this glucose-lowering medication improves how the body's tissues respond to insulin, enhancing insulin sensitivity. By performing these complementary functions, Glisulin XR provides a continuous, systemic approach to reducing and stabilizing overall circulating glucose, which is the essential benefit for individuals managing hyperglycemia.

Regulatory References

  1. Metformin - StatPearls - NCBI Bookshelf - NIH
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What side effects are possible with Glisulin XR?

Glisulin XR: Possible side effects and safety information

Glisulin XR (Metformin Extended-Release) has an officially documented safety profile characterized by specific frequency classifications and system-organ effects.

Adverse Reaction Classification

The most frequently reported adverse reactions are generally related to the Gastrointestinal System and are often classified as Very Common in official regulatory documents. These include diarrhea, nausea, vomiting, and abdominal pain, which are typically observed at the initiation of treatment and may diminish over time. Common effects include a metallic taste disturbance and headache.

Serious Adverse Reactions and Safety Constraints

Regulatory agencies document Lactic Acidosis as a rare but serious metabolic adverse reaction. The risk of this condition is officially stated to increase in certain circumstances and populations. Specifically, the medicine is contraindicated in individuals with severe renal impairment due to the significantly increased risk of drug accumulation and Lactic Acidosis. Furthermore, safety documents specify that excessive alcohol intake and certain medical procedures, such as radiologic studies using iodinated contrast media, are risk factors that may necessitate temporary interruption of the medicine.

Long-term use of Glisulin XR is associated with the official risk of developing Vitamin B12 deficiency.

This framework of classification and explicit constraints defines the medicine’s official safety profile, distinguishing common, generally transient effects from rare, critical risks tied to physiological function.

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Overdose and Emergency Response

Glisulin XR Overdose and when to seek help — Official Regulatory Information

Overdose of Glisulin XR (Metformin hydrochloride) is fundamentally defined by the risk of developing Lactic Acidosis, a severe and potentially life-threatening metabolic complication resulting from drug accumulation.

Documented Overdose Presentations and Risk: The documented presentations include nonspecific gastrointestinal distress (severe nausea, vomiting, abdominal pain, and diarrhea), systemic signs such as malaise, muscle pain (myalgias), somnolence, and feeling cold. Severe cases may exhibit hypotension and signs of respiratory distress (hyperpnea). The risk of Lactic Acidosis is explicitly stated to be increased in patients with renal impairment and in the elderly patient population. Cardiovascular collapse is a documented, severe outcome.

Emergency Actions and Management: Regulatory guidance mandates that individuals seek immediate medical attention and contact emergency services if an overdose is suspected. Urgent medical help is required upon the appearance of any nonspecific symptoms of Lactic Acidosis, such as unusual muscle pain or trouble breathing. No specific antidote is known for Metformin overdose. Management is primarily symptomatic and supportive treatment. Hemodialysis is the officially recommended procedure for the effective removal of the drug and correction of acidosis, and close monitoring of renal function and blood lactate levels is required.

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Therapeutic Uses of Glisulin XR

Main Uses of Glisulin XR

Glisulin XR is an extended-release oral medication primarily used to manage blood glucose levels in adults with type 2 diabetes mellitus. It belongs to the biguanide class of medications and is designed to release the active ingredient slowly into the body over an extended period.

The medication is typically utilized when glycemic control cannot be achieved through diet and exercise alone. It may be used as a standalone therapy or in combination with other glucose-lowering agents to help maintain blood sugar targets.

How Glisulin XR Works

Glisulin XR helps manage blood sugar through three primary mechanisms:

  • Reduction of Glucose Production: It limits the amount of glucose produced and released by the liver.
  • Improved Insulin Sensitivity: It increases the sensitivity of muscle tissue to insulin, allowing the body to use existing insulin more effectively to remove glucose from the bloodstream.
  • Delayed Glucose Absorption: It slows the absorption of glucose from the intestinal tract after meals.

Benefits of Extended-Release Therapy

The extended-release (XR) formulation offers specific therapeutic advantages compared to immediate-release versions:

Consistent Blood Sugar Control

Because the medication is released gradually, it helps maintain a more stable concentration of the active ingredient in the blood. This contributes to the management of both fasting blood glucose and post-meal glucose levels throughout the day.

Cardiovascular and Metabolic Support

Beyond glucose lowering, this medication is often associated with a neutral effect on body weight, which is beneficial for individuals managing type 2 diabetes. It may also support healthy lipid profiles by contributing to the maintenance of stable cholesterol and triglyceride levels.

Long-term Health Management

By assisting in the maintenance of target blood glucose levels, Glisulin XR plays a role in the broader strategy to reduce the risk of long-term complications associated with persistent high blood sugar, such as damage to the kidneys, nerves, and eyes.

Regulatory References

  1. NIH MedlinePlus guidance
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Eligibility and Restrictions for Use

Glisulin XR is approved for use in adults with Type 2 Diabetes Mellitus. Eligibility to use this medicine is strictly defined by regulatory authorities based on organ function and specific health conditions.

Contraindications and Restrictions

Glisulin XR must not be used by patients with:

  • Severe renal impairment (estimated GFR < 30 mL/min/1.73 m^2).
  • Acute or chronic metabolic acidosis, including diabetic ketoacidosis.
  • Known hypersensitivity to metformin hydrochloride.
  • Acute conditions that may impair renal function, such as severe infection or shock.

Use is restricted or not recommended for the following populations:

  • Renal Impairment: Initiation is not recommended for patients with an eGFR between 30 and 45 mL/min/1.73 m^2.
  • Hepatic Impairment: Use should be avoided in the presence of clinical or laboratory evidence of liver disease.
  • Pediatric Use: Safety and effectiveness for the extended-release (XR) formulation are not established in children and adolescents.
  • Temporary Discontinuation: The medicine must be temporarily stopped prior to or at the time of procedures involving intravascular iodinated contrast materials or surgery under general, spinal, or epidural anesthesia.
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What should I know about interactions with other medicines?

Glisulin XR (Metformin hydrochloride) has officially documented interaction patterns primarily concerning its elimination and pharmacodynamic effects. Co-administration with certain cationic drugs is documented to increase Glisulin XR’s systemic exposure. Medicines that interfere with renal tubular transport, such as Cimetidine, Ranolazine, Vandetanib, and Dolutegravir, may reduce Glisulin XR clearance, leading to increased plasma concentration (Cmax and AUC). This is an officially recognized pharmacokinetic interaction.

Pharmacodynamically, Glisulin XR has an additive effect when combined with other glucose-lowering agents like insulin or sulfonylureas, increasing the documented risk of hypoglycemia. Furthermore, official labeling notes an increased risk of lactic acidosis when Glisulin XR is used concurrently with Carbonic Anhydrase Inhibitors or when excessive alcohol intake occurs, as these substances can potentiate the effect on lactate metabolism.

Interaction-related restrictions exist for diagnostic procedures. Glisulin XR therapy must be temporarily suspended at the time of or prior to any radiological study involving iodinated contrast agents. The drug is then withheld for 48 hours and only restarted after renal function is confirmed as normal. Certain patient populations, such as geriatric subjects, have a higher risk of drug accumulation due to naturally reduced clearance, which may intensify interaction outcomes. Additionally, long-term use of Glisulin XR is associated with officially documented reduction in serum Vitamin B12 levels.

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Mechanism of Action

Glisulin XR (Metformin) acts by engaging specific enzyme systems and pathways primarily in the liver and muscle tissue to modulate the pathways governing glucose concentration. Its mechanism relies on three complementary biological actions.


Suppressing Glucose Output in the Liver

The drug initiates its action by interacting with Mitochondrial Complex I inside liver cells, which alters the cell's energy state. This change activates AMP-Activated Protein Kinase (AMPK), a key metabolic sensor, which then acts to inhibit the enzymes needed for hepatic gluconeogenesis (the production of new glucose). This foundational action reduces the amount of glucose the liver releases into the bloodstream.


Increasing Peripheral Tissue Sensitivity

Glisulin XR also influences tissues outside the liver, particularly muscle and fat cells. The drug's mechanism increases the cellular response to insulin, facilitating the movement of glucose transporters to the cell surface. This peripheral action increases the rate of glucose uptake and utilization by these tissues, facilitating the uptake and utilization of circulating glucose.


⬇️ Influencing Intestinal Absorption

The medication's mechanism includes a secondary effect in the digestive tract, where it contributes to a modest reduction in the amount of glucose absorbed from the small intestine. This action works in concert with the hepatic and peripheral effects, providing an additional factor in the net physiological reduction of plasma glucose concentration.

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Dosage and Administration Information

Administration of Glisulin XR

Glisulin XR is an oral tablet indicated for long-term use in chronic condition management. The administration guidelines are structured to support the medicine's extended-release design. The tablet must be swallowed whole and should never be crushed, cut, or chewed, as altering its physical form would disrupt the controlled release mechanism. If a dose is missed, the patient should not take a double dose to compensate, but must resume the next scheduled dose as usual.

Dosing and Frequency Patterns

The standard administration schedule for the extended-release form is typically once daily and must be taken with the evening meal. The instruction to take the medication with food is critical for proper use and absorption. Treatment begins with a low starting dose, commonly 500 mg or 1000 mg once daily. The dose is then gradually adjusted, or titrated, in increments, such as 500 mg weekly, to achieve the appropriate maintenance level. The maximum recommended dose for once-daily administration is 2000 mg.

Use in Specific Populations

Usage instructions include specific parameters for certain populations. For pediatric patients (ages 10 and older), the starting dose and titration schedule are specified, leading up to the 2000 mg maximum once daily. Additionally, there is a procedural restriction on use based on renal function (eGFR). The use of the medicine is restricted or not recommended when the patient’s kidney function falls below specific thresholds.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Glisulin XR

Evidence for Use in Type 2 Diabetes Mellitus

Research exploring the use of Glisulin XR primarily involves Randomized Controlled Trials (RCTs) and systematic reviews. These studies were evaluated in adults with Type 2 Diabetes Mellitus (T2DM), particularly focusing on adults with previously recorded elevated blood sugar levels. The main focus was on biomarkers monitored in relation to blood sugar, with key outcomes being Glycated Hemoglobin (HbA1c) and Fasting Plasma Glucose (FPG). Studies also monitored other metabolic factors, such as lipid profiles and markers related to insulin sensitivity. Findings describe patterns observed in the studies where blood sugar markers were measured across the adult patient populations. The design of these trials contributed to the research base for T2DM in adults.


Comparison of Extended-Release vs. Immediate-Release Metformin

A significant part of the research has focused on comparing the extended-release formulation (Glisulin XR) to the standard, immediate-release (IR) version of metformin in head-to-head trials. Research explored whether the sustained-release mechanism, which creates a prolonged drug profile, was associated with different measurements of blood sugar control compared to the IR version over the short term. Pharmacokinetic studies examined the extended timeframe of the drug's absorption. Findings describe patterns observed in the studies suggesting that the extended-release formulation provides comparable measurements of HbA1c and FPG to the IR formulation across the observed populations.


Long-term Research Gaps and Uncertainty

While many pivotal RCTs track results for 12 to 24 weeks, some observational studies and extensions were observed in patients for 12 months or more. Evidence contributes to the broader evidence landscape by providing some insight into sustained measurements beyond the initial trial window. However, long-term stability of the observed measurements is not fully established through extensive head-to-head RCTs comparing Glisulin XR specifically to IR metformin over multiple years. Data for certain groups remain insufficient, particularly the pediatric population, where follow-up durations were limited for the XR formulation. The results apply only to the populations studied, meaning the findings describe group patterns, and research does not provide individual predictions.

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Frequently Asked Questions (FAQ)

Common questions about Glisulin XR (FAQ)


Q: How long does it usually take to see results after starting Glisulin XR?

According to official product information, patients may start to see an improvement in their blood glucose (sugar) levels within the first 1 to 2 weeks of starting Glisulin XR. However, the full, measured glucose-lowering effect, often tracked by the A1C test, usually takes about 2 to 3 months to be fully established in the body.


Q: I heard Glisulin XR can cause weight changes; is this common?

Clinical studies that were reviewed by regulatory authorities indicate that Glisulin XR is generally associated with stable body weight or weight loss. This contrasts with some other medications used to manage the same condition.


Q: Do I need any special monitoring or tests while taking Glisulin XR?

Official product information recommends that a patient's kidney function, measured by eGFR, be checked at least once per year while taking this medication. Additionally, because long-term use is associated with potential decreases in Vitamin B12, periodic monitoring of those levels is indicated.


Q: Is Glisulin XR safe to use during pregnancy, according to official information?

Information from some authoritative sources suggests the medication's use during pregnancy may be considered. When taken by a breastfeeding patient, the drug passes into breast milk in very small amounts, and adverse effects are not typically reported for breastfed infants in available data.


Q: Can Glisulin XR affect my energy levels?

While Glisulin XR does not commonly cause general tiredness, official warnings list extreme tiredness or weakness as a potential symptom of the rare, but serious, side effect called lactic acidosis. Furthermore, feeling fatigued or having a lack of energy can be a symptom of the underlying high blood sugar condition that the medication is treating.


Q: How long does Glisulin XR stay in my system, generally speaking?

Pharmacological data indicate that Glisulin XR has an elimination half-life of approximately 17.6 hours in the blood. The half-life refers to the time it takes for the concentration of the medication in the bloodstream to be reduced by half.


Q: Can people with heart concerns generally use Glisulin XR?

Regulatory documents note that if a patient has an acute condition, such as certain types of heart failure, that can cause tissue hypoxia (low oxygen in the tissues), official guidance states temporary discontinuation may be required. Therefore, use requires careful assessment of risk, particularly kidney function, as stated in the label.


Q: Are there different strengths available for Glisulin XR?

Yes, the extended-release tablets are commercially available in a variety of dose strengths. These commonly include 500 mg, 750 mg, and 1000 mg tablets. These strengths are available for dispensing.


Q: Do studies suggest Glisulin XR affects blood pressure?

The clinical trials that established the safety and efficacy of Glisulin XR focused on blood sugar control. Reported clinical data indicated that the medication caused no significant change in blood pressure when compared to placebo or other similar drugs used in the studies.


Q: Do official sources describe any specific risks for women taking Glisulin XR?

Official labeling notes a potential effect for some women with Polycystic Ovary Syndrome (PCOS). In these patients, the medication may cause ovulation, which could potentially increase the chance of becoming pregnant.


Q: What are the known symptoms of an allergic reaction to Glisulin XR?

Hypersensitivity, which is the medical term for an allergic reaction, to the drug's active ingredient is listed as a contraindication. This means the condition is one for which the medication is contraindicated.


Q: Are there any lifestyle changes that are often studied alongside Glisulin XR use?

Patient information and clinical guidelines emphasize that Glisulin XR is designed to be used in conjunction with lifestyle management. Regulatory materials often remind patients of the importance of following medical and dietary advice regarding diet and exercise while on this medication.


Q: What happens to the Glisulin XR tablet after the drug is absorbed?

The extended-release formulation uses a specialized delivery system, and it is a known occurrence that the outer shell of the tablet may appear intact in the stool. Official patient counseling information clarifies that this is normal and does not mean the medication failed to be absorbed.


Q: What should I know about taking Glisulin XR if I have other health conditions?

Official labeling identifies several conditions that affect eligibility to use the drug. For example, severe kidney impairment is a condition for which the medication is contraindicated. Additionally, regulatory documents indicate temporary discontinuation is required before certain imaging procedures that involve iodinated contrast agents.


Q: Are there known interactions between Glisulin XR and certain vitamins or supplements?

Official warnings state that long-term use of Glisulin XR is associated with a decrease in the body's Vitamin B12 levels. This is why monitoring Vitamin B12 is often recommended during extended treatment, as outlined in regulatory documents.


Q: Do older adults use Glisulin XR differently than younger adults?

Official guidance states that use in older adults, who are geriatric subjects, is associated with regulatory requirements for closer monitoring of kidney function. This increased monitoring is due to the natural reduction in kidney clearance that occurs with age, which can increase the risk of potential complications.


Q: Are there any specific food or beverage types that are described as interacting with Glisulin XR?

Yes, regulatory documents contain a specific warning regarding excessive alcohol intake. This is because heavy alcohol consumption can significantly increase the risk of a rare, but serious, side effect called lactic acidosis.


Q: Is Glisulin XR approved for use in children?

Official regulatory documents indicate that the extended-release formulation of this medication is approved for use in children aged 10 years and older for the management of Type 2 Diabetes Mellitus.


Q: Why might Glisulin XR be a preferred option over immediate-release formulations?

Clinical experience and patient counseling information suggest that the extended-release formulation is formulated for a simpler once-daily dosing schedule. It is also frequently associated with a lower incidence of gastrointestinal side effects compared to the immediate-release version.


Q: How is Glisulin XR eliminated from the body?

Pharmacological data confirms that Glisulin XR is not metabolized by the liver. Instead, the medication is primarily eliminated from the body unchanged through the urine, which means the kidneys play the main role in its clearance.


Q: What clinical trials led to the approval of Glisulin XR?

The safety and effectiveness of the drug were established through controlled clinical trials. Regulatory documents contain detailed summary tables and data from these pivotal studies, which compared Glisulin XR to placebo and/or the immediate-release formulation.


Q: Is Glisulin XR used by people who are not diagnosed with diabetes?

The primary approved use (indication) for Glisulin XR is for the management of Type 2 Diabetes Mellitus. It is important to know that regulatory documents define approved uses, but the drug is sometimes used to manage conditions, such as Polycystic Ovary Syndrome (PCOS).

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How should Glisulin XR be stored and disposed of?

Glisulin XR (metformin hydrochloride extended-release tablets) must be stored at Controlled Room Temperature, specifically between 20°C and 25°C (68°F and 77°F). Temperatures may briefly exceed this range, but must remain within 15°C and 30°C.

Storage Protection and Safety

The medication must be protected from both moisture and light and should be dispensed in a light-resistant container. It is a mandatory requirement that Glisulin XR be stored out of the sight and reach of children.

Disposal Requirements

To dispose of unused or expired Glisulin XR, use an authorized drug take-back program. As the product is not on the official flush list, it must not be flushed down a toilet or poured into a drain. If a take-back program is unavailable, the tablets should be mixed with an undesirable substance, placed in a sealed bag, and discarded with household trash.

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

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