- Drugs that cause blood glucose levels to increase may diminish the effectiveness of Glucovance therapy. When these drugs are stopped, patients should be closely observed for signs of low blood glucose. These drugs include
- Cimetidine (Tagamet), by decreasing the elimination of metformin from the body, can increase the amount of metformin in the blood by 40%. This may increase the frequency of side effects from metformin.
- Contrast media used for radiological procedures may reduce kidney function which reduces elimination of metformin, leading to increased concentrations of metformin in the blood. Metformin should be stopped 48 hours before and after use of contrast media.
- Alcohol consumption increases the effect of metformin on lactate production, increasing the risk of lactic acidosis.
- Certain drugs may increase the blood glucose lowering actions of glyburide. It is possible that hypoglycemia (low blood glucose) and symptoms from hypoglycemia may result. Such drugs include
- Coadministration of glyburide with bosentan (Tracleer) may cause an abnormal increase in liver enzymes. Therefore, concomitant use of these agents is not recommended.
- Colesevelam (Welchol) may reduce blood levels of glyburide. Patients are advised to take glyburide 1 hour before or 4 hours after colesevelam administration to minimize the risk of their interaction.
Quick GuideDiabetes Diet: Healthy Meal Plans for Diabetes-Friendly Eating
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