Side effects of hemorheologic agents may include:

Hemorheologic agents are medications that influence the flow properties of blood, primarily used in conditions where blood flow is impaired. Among the common side effects of these agents, dizziness and headache can occur. These symptoms are often the result of changes in blood viscosity or alterations in circulation dynamics. When blood flow changes, it can lead to variations in oxygen delivery to the brain or changes in intracranial pressure, both of which can manifest as dizziness and headaches.

In contrast, while weight gain, constant fatigue, and excessive sweating may occur with various medications, they are not typically associated with hemorheologic agents. Weight gain might be more related to medications that affect metabolism or fluid retention, and constant fatigue could stem from a range of issues unrelated to the changes induced by hemorheologic agents. Excessive sweating is often linked to specific hormonal or environmental factors rather than the pharmacological class of hemorheologic agents. Therefore, the side effects of dizziness and headache are more aligned with the pharmacodynamics of these medications, making them the correct choice in this context.