If Glucophage is unavailable, which drug may be substituted?

In the context of managing diabetes, Metformin is the generic name for Glucophage, which indicates that substituting Glucophage with Metformin would not change the drug; they are essentially the same. This is particularly relevant in scenarios where patients need to maintain consistent medication regimens for effective diabetes management.

The other options presented are different classes of medications used for treating diabetes, such as sulfonylureas (like Repaglinide), thiazolidinediones (like Troglitazone), and alpha-glucosidase inhibitors (like Acarbose). Each of these drugs works differently compared to Metformin and may not provide the same efficacy or safety profile as Metformin, thus making them unsuitable as direct substitutes for Glucophage.