Glimepiride stimulates the insulin release from pancreatic β-cells and reduces glucose output from the liver. It also increases insulin sensitivity at peripheral target sites.
In principle, the dosage of Glimepiride is governed by the desired blood sugar level. The dosage of Glimepiride must be the lowest which is sufficient to achieve the desired metabolic control.
The initial and the maintenance doses are set based on the results of regular checking of glucose in blood and urine. Monitoring of glucose levels in blood and urine also serves to detect either primary or secondary failure of therapy.
Initial dose and dose titration: Usual initial dose is 1 mg once daily. If necessary, the daily dose can be increased. Any increase can be based on regular blood sugar monitoring, and should be gradual, i.e., at intervals of one to two weeks and carried out step wise at follows: 1 mg-2 mg-3 mg-4 mg-6 mg.
Dose range in patients with well controlled diabetes: Usual dose range in patients with well controlled diabetes is 1 to 4 mg daily.
Distribution of doses: Timing and distribution of doses are decided by the physician, in consideration of the patient’s current life style. Normally, a single daily dose is sufficient. This should be taken immediately before a substantial breakfast or – if none is taken – immediately before the first main meals. It is very important not to skip meals after taking the drug.
Secondary dosage adjustment: As the control of diabetes improves, sensitivity to insulin increases; therefore, Glimepiride requirement may fall as treatment proceeds. To avoid hypoglycaemia, timely dose reduction or cessation of Glimepiride therapy must be considered.
A dose adjustment must also be considered whenever the patient’s weight or life style changes, or other factors arise which cause an increased susceptibility to hypo- or hyperglycaemia.
Changeover from other oral antidiabetics to Glimepiride: There is no exact dosage relationship between Glimepiride and other oral blood sugar lowering agents. When substituting Glimepride for other such agents, the initial daily dose is 1 mg; this applies even in changeover from the maximum dose of other oral blood sugar lowering agents. Any dose increase should be in accordance with guideline given above in initial dose and dose titration.
Consideration must be given to the potency and duration of action of the previous blood sugar lowering agent. It may be necessary to interrupt treatment to avoid additive effects which would increase the risk of hypoglycaemia.