Which adverse reaction is commonly associated with insulin administration?

Weight gain is a commonly associated adverse reaction with insulin administration. Insulin plays a crucial role in regulating glucose metabolism and is critical for energy utilization in the body. When insulin is administered, it facilitates the uptake of glucose into cells, leading to increased energy storage. While this is beneficial for patients with diabetes in preventing hyperglycemia, one of the side effects of insulin therapy can be an increase in body weight. This occurs because insulin promotes lipogenesis, the process of converting glucose into fat, and can also lead to increased appetite in some individuals.

The other options listed, such as diarrhea, constipation, and dizziness, are not commonly linked to insulin administration. While patients may experience a variety of side effects with different medications, the direct relationship between insulin and weight gain is well documented in clinical practice, making it a significant consideration in the management of diabetes, especially in patient education and treatment planning.