SUMELITUS®-M

Pharmacological Classification

• Glimepiride: Sulfonylurea (third generation)
• Metformin: Biguanide

What is this medicine?

This tablet contains two medicines that work together to control blood sugar in people with type 2 diabetes:

• Glimepiride: Helps your pancreas release more insulin.
• Metformin: Helps your body use insulin better and reduces sugar production in the liver.

Mechanism of Action

• Glimepiride:
  • Stimulates pancreatic ?-cells to release insulin by binding to sulfonylurea receptors (SUR1) ? closure of ATP-sensitive potassium channels ? depolarization ? calcium influx ? insulin exocytosis.
  • May also increase insulin sensitivity in peripheral tissues.
• Metformin:
  • Decreases hepatic glucose production (inhibits gluconeogenesis).
  • Enhances peripheral glucose uptake and utilization.
  • Reduces intestinal glucose absorption.
  • Does not stimulate insulin secretion ? minimal risk of hypoglycemia when used alone.

Combined Effect: Targets both insulin deficiency (via glimepiride) and insulin resistance (via metformin) ? complementary glycemic control.

Indications

• Type 2 Diabetes Mellitus (T2DM) inadequately controlled with diet, exercise, and monotherapy with either agent.
• Suitable for patients requiring combination therapy to achieve HbA1c targets.

Dosage Forms

• Glimepiride 1 mg + Metformin 500 mg
• Glimepiride 2 mg + Metformin 500 mg

Advantages of Combination

• Dual mechanism addresses multiple pathophysiologic defects in T2DM
• Greater HbA1c reduction compared to monotherapy
• Metformin mitigates glimepiride-induced weight gain and reduces insulin resistance
• Lower doses of each drug reduce dose-related adverse effects
• Improved patient adherence via fixed-dose combination (FDC)

Adverse Effects

• Glimepiride: Hypoglycemia, weight gain, dizziness, rash
• Metformin: Gastrointestinal upset (nausea, diarrhea, abdominal pain), vitamin B12 deficiency with long-term use, rare lactic acidosis
• Combination Risks: Hypoglycemia (mainly from glimepiride), GI intolerance (mainly from metformin)

Contraindications

• Type 1 diabetes mellitus
• Diabetic ketoacidosis
• Severe renal impairment (eGFR <30 mL/min/1.73m²)
• Hepatic failure or alcoholism (metformin: lactic acidosis risk)
• Pregnancy and lactation (relative; use insulin if needed)

When to get medical help quickly

• Severe dizziness, fainting, confusion
• Signs of allergic reaction (swelling of face/lips, difficulty breathing)
• Unexplained muscle pain or weakness

Tips for best results

• Follow your doctor’s diet and exercise advice
• Check your blood sugar regularly
• Do not stop the medicine suddenly
• Keep regular follow-up appointments