Leg Edema: Could It Be Due to the 'Medicine' You Take? Finding the Unexpected Culprit

Modern medicine explains the insights of Donguibogam in scientific terms. Fluid balance, which corresponds to the concept of water pathways, depends on complex interactions among blood flow, the lymphatic system, kidney function, and hormonal regulation. Certain medications that influence these systems can induce edema, most notably calcium channel blockers, which are antihypertensives, and corticosteroids, which have potent anti-inflammatory effects. Calcium channel blockers relax vascular smooth muscle to dilate vessels and lower blood pressure. As small vessels at the arterial ends dilate, pressure inside the capillaries increases, much like water pressure rising when a tap is opened wider. This elevated pressure causes fluid to leave the vessels and collect in surrounding tissues, with gravity drawing it primarily into the ankles and legs. This type of swelling tends to worsen toward the evening and typically appears symmetrically in both legs. Corticosteroids are used to manage inflammation and suppress the immune system. However, they also exert mineralocorticoid activity, prompting the kidneys to reabsorb sodium and water. This accumulation of salt and water can lead to systemic edema, often manifesting as facial fullness known as moon face or as sudden weight gain. Nonsteroidal anti-inflammatory drugs can also induce edema by decreasing kidney blood flow and reducing sodium excretion. Certain antidepressants, diabetes medications, and hormone preparations may cause fluid retention as well. If you suspect drug-induced edema, do not discontinue or alter your medication on your own. Consult your physician to determine the cause and adjust your prescription, as modifying the drug or dosage can often resolve the swelling.