Which of the following is a common side effect of metformin?

Hyperglycemia, or elevated blood sugar levels, is not a side effect of metformin; rather, the drug is specifically used to lower blood glucose in individuals with type 2 diabetes. Its primary function is to improve insulin sensitivity and decrease hepatic glucose production, thereby reducing hyperglycemic episodes.

Hypotension, or low blood pressure, is not a recognized side effect of metformin. The medication does not influence blood pressure directly; instead, it primarily targets blood glucose levels. Patients may experience hypotension due to other medications or conditions, but it is not linked to metformin use.

Bradycardia, which refers to a slower than normal heart rate, is not associated with metformin. Metformin's mechanism of action does not affect heart rate or cardiac function directly. Any occurrences of bradycardia in patients would likely be attributed to other factors or medications unrelated to metformin.