Maximum dose of gliclazide for diabetic management
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Here is a complete summary of gliclazide dosing for diabetic management:
Gliclazide - Maximum Dose & Dosing Summary
Gliclazide is a second-generation sulfonylurea used in type 2 diabetes management. It is not available in the United States but is widely used elsewhere.
Formulations and Maximum Doses
| Formulation | Starting Dose | Usual Dose | Maximum Dose |
|---|---|---|---|
| Immediate-release (IR) 80 mg tablets | 40-80 mg/day | 80-160 mg/day | 320 mg/day |
| Modified-release (MR) 30 mg / 60 mg tablets | 30 mg once daily | 30-90 mg/day | 120 mg/day |
Key Dosing Points
- IR tablets: Starting dose is 40-80 mg daily. Doses above 160 mg are typically divided into twice-daily administration (with breakfast and evening meal). Maximum is 320 mg/day.
- MR tablets (Diamicron MR): Taken once daily with breakfast. Titrate in 30 mg increments. Maximum is 120 mg/day.
- Half-life of the IR formulation is approximately 10 hours.
- Gliclazide is completely metabolized by the liver to inactive metabolites - this is a key advantage over glyburide/glibenclamide, as it reduces hypoglycemia risk, particularly in elderly patients and those with renal impairment.
Special Populations
- Renal impairment (CKD): Gliclazide and glipizide are preferred sulfonylureas in CKD because they lack active metabolites. Start low and titrate carefully. However, hypoglycemia risk is still increased in moderate-to-severe CKD.
- Elderly: Use with caution - hypoglycemia can be especially dangerous.
- Hepatic impairment: Use with caution, as gliclazide is hepatically metabolized.
Mechanism
Gliclazide binds to the sulfonylurea receptor (SUR1) on pancreatic beta cells, stimulating insulin secretion. It is 100-200 times more potent than first-generation sulfonylureas like tolbutamide.
Sources: Katzung's Basic and Clinical Pharmacology, 16th Edition, p. 1185 | NHS Gliclazide Guidance
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