Generic name: glyburide 2.5mg, metformin hydrochloride 500mg
Dosage form: tablet, film coated
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Dosage of GLUCOVANCE must be individualized on the basis of both effectiveness and tolerance while not exceeding the maximum recommended daily dose of 20 mg glyburide/2000 mg metformin. GLUCOVANCE should be given with meals and should be initiated at a low dose, with gradual dose escalation as described below, in order to avoid hypoglycemia (largely due to glyburide), reduce GI side effects (largely due to metformin), and permit determination of the minimum effective dose for adequate control of blood glucose for the individual patient.
With initial treatment and during dose titration, appropriate blood glucose monitoring should be used to determine the therapeutic response to GLUCOVANCE and to identify the minimum effective dose for the patient. Thereafter, HbA1c should be measured at intervals of approximately 3 months to assess the effectiveness of therapy. The therapeutic goal in all patients with type 2 diabetes is to decrease FPG, PPG, and HbA1c to normal or as near normal as possible. Ideally, the response to therapy should be evaluated using HbA1c (glycosylated hemoglobin), which is a better indicator of long-term glycemic control than FPG alone.
No studies have been performed specifically examining the safety and efficacy of switching to GLUCOVANCE therapy in patients taking concomitant glyburide (or other sulfonylurea) plus metformin. Changes in glycemic control may occur in such patients, with either hyperglycemia or hypoglycemia possible. Any change in therapy of type 2 diabetes should be undertaken with care and appropriate monitoring.
In Patients with Inadequate Glycemic Control on Diet and Exercise
Recommended starting dose: 1.25 mg glyburide and 250 mg metformin hydrochloride once or twice daily with meals. GLUCOVANCE 1.25 mg/250 mg tablets are no longer available, however glyburide 1.25 mg and metformin hydrochloride 250mg tablets are available as individual components or a combination tablet.
For patients with type 2 diabetes whose hyperglycemia cannot be satisfactorily managed with diet and exercise alone, the recommended starting dose is 1.25 mg glyburide and 250 mg metformin hydrochloride once a day with a meal. As initial therapy in patients with baseline HbA1c >9% or an FPG >200 mg/dL, a starting dose of 1.25 mg glyburide and 250 mg metformin hydrochloride twice daily with the morning and evening meals may be used. Dosage increases should be made in increments of 1.25 mg glyburide and 250 mg metformin hydrochloride per day every 2 weeks up to the minimum effective dose necessary to achieve adequate control of blood glucose. In clinical trials of GLUCOVANCE as initial therapy, there was no experience with total daily doses >10 mg/2000 mg per day. GLUCOVANCE 5 mg/500 mg should not be used as initial therapy due to an increased risk of hypoglycemia.
GLUCOVANCE Use in Patients with Inadequate Glycemic Control on a Sulfonylurea and/or Metformin
Recommended starting dose: 2.5 mg/500 mg or 5 mg/500 mg twice daily with meals.
For patients not adequately controlled on either glyburide (or another sulfonylurea) or metformin alone, the recommended starting dose of GLUCOVANCE is 2.5 mg/500 mg or 5 mg/500 mg twice daily with the morning and evening meals. In order to avoid hypoglycemia, the starting dose of GLUCOVANCE should not exceed the daily doses of glyburide or metformin already being taken. The daily dose should be titrated in increments of no more than 5 mg/500 mg up to the minimum effective dose to achieve adequate control of blood glucose or to a maximum dose of 20 mg/2000 mg per day.
For patients previously treated with combination therapy of glyburide (or another sulfonylurea) plus metformin, if switched to GLUCOVANCE, the starting dose should not exceed the daily dose of glyburide (or equivalent dose of another sulfonylurea) and metformin already being taken. Patients should be monitored closely for signs and symptoms of hypoglycemia following such a switch and the dose of GLUCOVANCE should be titrated as described above to achieve adequate control of blood glucose.
Addition of Thiazolidinediones to GLUCOVANCE Therapy
For patients not adequately controlled on GLUCOVANCE, a thiazolidinedione can be added to GLUCOVANCE therapy. When a thiazolidinedione is added to GLUCOVANCE therapy, the current dose of GLUCOVANCE can be continued and the thiazolidinedione initiated at its recommended starting dose. For patients needing additional glycemic control, the dose of the thiazolidinedione can be increased based on its recommended titration schedule. The increased glycemic control attainable with GLUCOVANCE plus a thiazolidinedione may increase the potential for hypoglycemia at any time of day. In patients who develop hypoglycemia when receiving GLUCOVANCE and a thiazolidinedione, consideration should be given to reducing the dose of the glyburide component of GLUCOVANCE. As clinically warranted, adjustment of the dosages of the other components of the antidiabetic regimen should also be considered.
Patients Receiving Colesevelam
When colesevelam is coadministered with glyburide, maximum plasma concentration and total exposure to glyburide is reduced. Therefore, GLUCOVANCE should be administered at least 4 hours prior to colesevelam.
Recommendations for Use in Renal Impairment
Assess renal function prior to initiation of GLUCOVANCE and periodically thereafter.
GLUCOVANCE is contraindicated in patients with an estimated glomerular filtration rate (eGFR) below 30 mL/minute/1.73 m2.
Initiation of GLUCOVANCE in patients with an eGFR between 30 – 45 mL/minute/1.73 m2 is not recommended.
In patients taking GLUCOVANCE whose eGFR later falls below 45 mL/min/1.73 m2, assess the benefit risk of continuing therapy.
Discontinue GLUCOVANCE if the patient’s eGFR later falls below 30 mL/minute/1.73 m2
Discontinuation for Iodinated Contrast Imaging Procedures
Discontinue GLUCOVANCE at the time of, or prior to, an iodinated contrast imaging procedure in patients with an eGFR between 30 and 60 mL/min/1.73 m2; in patients with a history of liver disease, alcoholism or heart failure; or in patients who will be administered intra-arterial iodinated contrast. Re-evaluate eGFR 48 hours after the imaging procedure; restart GLUCOVANCE if renal function is stable.
Specific Patient Populations
GLUCOVANCE is not recommended for use during pregnancy. The initial and maintenance dosing of GLUCOVANCE should be conservative in patients with advanced age, due to the potential for decreased renal function in this population. Any dosage adjustment requires a careful assessment of renal function.
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- Drug class: antidiabetic combinations