Product Information

Registration Status: Active

GLYBORAL TABLET 5mg is approved to be sold in Singapore with effective from 2002-01-26. It is marketed by ZYFAS MEDICAL CO, with the registration number of SIN11789P.

This product contains Glibenclamide 5mg in the form of TABLET. It is approved for ORAL use.

This product is manufactured by USV LTD in INDIA.

It is a Prescription Only Medicine that can only be obtained from a doctor or a dentist, or a pharmacist with a prescription from a Singapore-registered doctor or dentist.



Glyburide is an oral antihyperglycemic agent used for the treatment of non-insulin-dependent diabetes mellitus (NIDDM). It belongs to the sulfonylurea class of insulin secretagogues, which act by stimulating β cells of the pancreas to release insulin. Sulfonylureas increase both basal insulin secretion and meal-stimulated insulin release. Medications in this class differ in their dose, rate of absorption, duration of action, route of elimination and binding site on their target pancreatic β cell receptor. Sulfonylureas also increase peripheral glucose utilization, decrease hepatic gluconeogenesis and may increase the number and sensitivity of insulin receptors. Sulfonylureas are associated with weight gain, though less so than insulin. Due to their mechanism of action, sulfonylureas may cause hypoglycemia and require consistent food intake to decrease this risk. The risk of hypoglycemia is increased in elderly, debilitated and malnourished individuals. Glyburide has been shown to decrease fasting plasma glucose, postprandial blood glucose and glycosolated hemoglobin (HbA1c) levels (reflective of the last 8-10 weeks of glucose control). Glyburide appears to be completely metabolized, likely in the liver. Although its metabolites exert a small hypoglycemic effect, their contribution to glyburide's hypoglycemic effect is thought to be clinically unimportant. Glyburide metabolites are excreted in urine and feces in approximately equal proportions.


Indicated as an adjunct to diet to lower the blood glucose in patients with NIDDM whose hyperglycemia cannot be satisfactorily controlled by diet alone.

Mechanism of Action

Sulfonylureas such as glyburide bind to ATP-sensitive potassium channels on the pancreatic cell surface, reducing potassium conductance and causing depolarization of the membrane. Depolarization stimulates calcium ion influx through voltage-sensitive calcium channels, raising intracellular concentrations of calcium ions, which induces the secretion, or exocytosis, of insulin.


Significant absorption within 1 hour and peak plasma levels are reached in 2 to 4 hours. Onset of action occurs within one hour.
Steady state Vd=0.125 L/kg; Vd during elimination phase=0.155 L/kg.
Primarily hepatic (mainly cytochrome P450 3A4). The major metabolite is the 4-trans-hydroxy derivative. A second metabolite, the 3-cis-hydroxy derivative, also occurs. These metabolites do not contribute clinically significant hypoglycemic action in humans as they are only weakly active; however, retention of 4-trans-hydroxyglyburide may prolong the hypoglycemic effect of the agent in those with severe renal impairment.


78 ml/hr/kg in healthy adults. Clearance may be substantially decreased in those with severe renal impairment.


Oral rat LD50: > 20,000 mg/kg. Oral mouse LD50: 3250 mg/kg.

Active Ingredient/Synonyms

1-((p-(2-(5-chloro-o-anisamido)ethyl)phenyl)sulfonyl)-3-cyclohexylurea | 1-(p-(2-(5-chloro-2-methoxybenzamido)ethyl)benzenesulfonyl)-3-cyclohexylurea | 5-chloro-N-(2-(4-((((cyclohexylamino)carbonyl)amino)sulfonyl)phenyl)ethyl)-2-methoxybenzamide | Glibenclamida | Glibenclamide | Glibenclamidum | Glyburide |

Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.


  1. Health Science Authority of Singapore - Reclassified POM
  2. Drugbank