Glunor XR 500 mg Tablet

Glunor XR 500 mg Tablet — Metformin Hydrochloride (Extended Release)

Overview

Glunor XR 500 mg is the extended-release metformin formulation from Eskayef Pharmaceuticals Ltd., designed to release the drug slowly over time for once-daily dosing. This reduces peak plasma concentration spikes that are often responsible for gastrointestinal side effects with immediate-release metformin, making it a preferred option for patients with GI sensitivity or those seeking simpler once-daily dosing.

Mechanism of Action

Metformin XR uses a gel-matrix or osmotic delivery system that controls drug release over several hours, maintaining therapeutic plasma levels with a single daily dose. The underlying glucose-lowering mechanism is identical to immediate-release metformin — reduced hepatic gluconeogenesis, decreased intestinal glucose absorption, and improved peripheral insulin sensitivity — but the smoother absorption profile improves tolerability.

Indications

Glunor XR 500 mg is indicated for type 2 diabetes mellitus, particularly in patients who experience gastrointestinal intolerance with immediate-release metformin or who prefer the convenience of once-daily dosing for better adherence. It can be used as monotherapy or combined with other antidiabetic agents as prescribed.

Dosage and Administration

The typical starting dose is 500 mg once daily with the evening meal, increased in increments of 500 mg at intervals of at least one week as tolerated, up to a maximum of 2000 mg once daily. Glunor XR tablets must be swallowed whole and never crushed, split, or chewed, as this disrupts the extended-release mechanism and can cause rapid drug release.

Contraindications

Contraindicated in severe renal impairment (eGFR <30 mL/min/1.73m²), metabolic acidosis including diabetic ketoacidosis, and known hypersensitivity to metformin. Not recommended for patients with swallowing difficulties or significant gastrointestinal strictures, given the tablet's intact-release design.

Side Effects

Glunor XR is generally associated with a lower incidence of gastrointestinal side effects (nausea, diarrhea, abdominal discomfort) compared to immediate-release metformin, although these can still occur, particularly during initial titration. Reduced vitamin B12 absorption may occur with long-term use. Patients may occasionally notice the tablet shell-like remnant in stool — this is the inert matrix and does not indicate failure of drug absorption.

Drug Interactions

Iodinated contrast media require temporary discontinuation of metformin before and after the procedure due to acute kidney injury risk. Alcohol should be limited. Disclose all concurrent medications, including supplements, to your physician or pharmacist to avoid interactions affecting renal clearance or lactate metabolism.

Special Precautions

Do not switch between immediate-release and extended-release metformin without physician guidance, as dosing schedules differ. Renal function should be assessed before initiation and monitored periodically. Temporary discontinuation is advised during acute illness, dehydration, or conditions causing hypoxia.

Storage

Store below 30°C in a dry place, protected from light. Keep out of reach of children.

Frequently Asked Questions

Q1: Why should Glunor XR not be crushed or split?
Crushing or splitting destroys the extended-release matrix, causing the full dose to be released at once, which increases the risk of side effects and reduces the intended once-daily benefit.

Q2: Is it normal to see a tablet-like remnant in stool with Glunor XR?
Yes, the inert outer matrix of extended-release metformin tablets is sometimes visible in stool; this is expected and does not mean the medication was not absorbed.

Q3: Can Glunor XR be taken in the morning instead of evening?
It can be taken at a consistent time that suits the patient's routine, though taking it with the evening meal is commonly recommended; follow your physician's specific instructions.

Q4: Does Glunor XR cause less stomach upset than regular metformin?
Many patients experience fewer gastrointestinal side effects with the extended-release formulation due to its smoother, slower drug release profile.

Medical Disclaimer: This information is provided for educational purposes only and does not replace professional medical advice. Always consult a registered physician or pharmacist before starting, stopping, or changing any medication. Dosage and suitability vary by individual health condition.