Active Substance: vildagliptin
Common Name: vildagliptin
ATC Code: A10BH02
Marketing Authorisation Holder: Novartis Europharm Limited
Active Substance: vildagliptin
Authorisation Date: 2008-11-19
Therapeutic Area: Diabetes Mellitus, Type 2
Pharmacotherapeutic Group: Drugs used in diabetes
Vildagliptin is indicated in the treatment of type-2 diabetes mellitus in adults:
- in patients inadequately controlled by diet and exercise alone and for whom metformin is inappropriate due to contraindications or intolerance;
as dual oral therapy in combination with
- metformin, in patients with insufficient glycaemic control despite maximal tolerated dose of monotherapy with metformin;
- a sulphonylurea, in patients with insufficient glycaemic control despite maximal tolerated dose of a sulphonylurea and for whom metformin is inappropriate due to contraindications or intolerance;
- a thiazolidinedione, in patients with insufficient glycaemic control and for whom the use of a thiazolidinedione is appropriate;
as triple oral therapy in combination with
- a sulphonylurea and metformin when diet and exercise plus dual therapy with these medicinal products do not provide adequate glycaemic control;
- vildagliptin is also indicated for use in combination with insulin (with or without metformin) when diet and exercise plus a stable dose of insulin do not provide adequate glycaemic control.
What is Xiliarx?
Xiliarx is a medicine that contains the active substance vildagliptin. It is available as tablets (50 mg).
This medicine is the same as Galvus, which is already authorised in the European Union (EU). The company that makes Galvus has agreed that its scientific data can be used for Xiliarx.
What is Xiliarx used for?
Xiliarx is used to treat type-2 diabetes mellitus. It can be used in the following ways:
- on its own (monotherapy) in patients whose diabetes is not sufficiently controlled by diet and exercise and who cannot take metformin;
- together with metformin, a thiazolidinedione or a sulphonylurea (dual therapy) when the patient’s diabetes is insufficiently controlled by this other medicine taken alone, but it is only used in combination with a sulphonylurea in patients who cannot take metformin;
- together with a sulphonylurea and metformin (triple therapy) in patients whose diabetes is not sufficiently controlled by these medicines plus diet and exercise;
- together with insulin (with or without metformin) in patients whose diabetes is not sufficiently controlled by diet and exercise plus a stable dose of insulin.
The medicine can only be obtained with a prescription.
How is Xiliarx used?
In adults, the recommended dose of Xiliarx is:
- one tablet in the morning and another in the evening (100 mg per day), when used alone, with metformin, with a thiazolidinedione, with metformin plus a sulphonylurea, or with insulin (with or without metformin);
- one tablet in the morning (50 mg per day) when taken with a sulphonylurea. A lower dose of the sulphonylurea may also be considered to reduce the risk of hypoglycaemia (low blood glucose levels).
The daily dose should not exceed two tablets (100 mg).
How does Xiliarx work?
Type-2 diabetes is a disease in which the pancreas does not make enough insulin to control the level of glucose (sugar) in the blood or when the body is unable to use insulin effectively. The active substance in Xiliarx, vildagliptin, is a dipeptidyl-peptidase-4 (DPP-4) inhibitor. It works by blocking the breakdown of ‘incretin’ hormones in the body. These hormones are released after a meal and stimulate the pancreas to produce insulin. By increasing levels of incretin hormones in the blood, vildagliptin stimulates the pancreas to produce more insulin when blood glucose levels are high. Vildagliptin does not work when the blood glucose is low. Vildagliptin also reduces the amount of glucose made by the liver, by increasing insulin levels and decreasing the levels of the hormone glucagon. Together, these processes reduce blood glucose levels and help to control type-2 diabetes.
How has Xiliarx been studied?
Xiliarx has been studied in eleven main studies involving a total of over 5,000 patients with type-2 diabetes and insufficient control of blood glucose levels.
Five of these studies looked at the effects of Xiliarx taken alone in a total of 3,644 patients, comparing it with placebo (a dummy treatment), metformin, rosiglitazone (a thiazolidinedione) or gliclazide (a sulphonylurea).
Four studies compared the effects of Xiliarx, taken at doses of 50 or 100 mg a day for 24 weeks, with those of placebo, when used as an add-on to existing treatment with metformin (544 patients), pioglitazone (a thiazolidinedione, 463 patients), glimepiride (a sulphonylurea, 515 patients) or insulin (296 patients).
A further study compared Galvus with placebo as an add-on treatment in 318 patients who were already taking metformin and glimepiride.
A further study compared Galvus with placebo as an add-on treatment in 449 patients who were already taking a stable dose of long-acting insulin. Some of the patients were also taking metformin.
In all studies, the main measure of effectiveness was the change in blood levels of a substance called glycosylated haemoglobin (HbA1c), which gives an indication of how well blood glucose is controlled.
What benefit has Xiliarx shown during the studies?
Xiliarx used on its own was effective at reducing levels of HbA1c, but was less effective than the comparator medicines. In the study comparing Xiliarx with metformin, significantly better results were seen with metformin: a reduction in HbA1c of 1.5 percentage points after 52 weeks compared with a reduction of around 1 percentage point in patients treated with Xiliarx.
When used as an add-on to existing treatment for type-2 diabetes, Xiliarx was more effective than placebo in reducing HbA1c levels. With metformin and with pioglitazone, the 100 mg daily dose was more effective than the 50 mg daily dose, with a reduction in HbA1c levels of between 0.8 and 1.0 percentage points. In combination with glimepiride, both 50 mg and 100 mg daily doses caused a reduction of around 0.6 percentage points. In contrast, patients adding placebo to their existing treatment showed smaller changes in HbA1c levels, ranging from a fall of 0.3 to a rise of 0.2 percentage points.
In combination with metformin and glimepiride, 50 mg Galvus taken twice a day reduced HbA1c levels by 1 percentage point, compared with a reduction of 0.3 percentage points in patients taking placebo.
In the study involving 296 patients taking insulin, adding Galvus caused a greater reduction in HbA1c levels than adding placebo, but the size of this effect was small possibly due to the fact that the study included long-term patients who were less likely to show improvement. However, in another study involving 449 patients taking insulin, the size of this effect was significant. Patients taking Galvus in addition to insulin, with or without metformin, had a reduction in HbA1c levels of 0.77 percentage points, compared with 0.05 percentage points in patients taking placebo in addition to insulin.
What is the risk associated with Xiliarx?
The most common side effect with Xiliarx (seen in between 1 and 10 patients in 100) is dizziness. For the full list of all side effects reported with Xiliarx, see the package leaflet.
Xiliarx must not be used in people who are hypersensitive (allergic) to vildagliptin or any of the other ingredients.
Because vildagliptin has been associated with liver problems, patients should have tests to check their liver function before treatment with Xiliarx and at regular intervals during treatment.
Why has Xiliarx been approved?
The CHMP noted that Xiliarx was effective as an add-on to metformin, a thiazolidinedione, or a sulphonylurea (dual therapy), a sulphonylurea and metformin (triple therapy) or insulin with or without metformin, and concluded that the benefits of the add-on treatment outweigh the risks.
The CHMP also considered the use of Xiliarx on its own and concluded that it was effective in reducing blood glucose but less so than metformin. Xiliarx should therefore be used only in patients for whom metformin is inappropriate either because of side effects occurring with metformin or because they have a condition that makes metformin unsuitable for them.
Other information about Xiliarx
The European Commission granted a marketing authorisation valid throughout the European Union for Xiliarx on 19 November 2008.
For more information about treatment with Xiliarx, read the package leaflet (also part of the EPAR) or contact your doctor or pharmacist.
Source: European Medicines Agency