Lasix is a diuretic that acts to decrease the free water content of the body. Typically, patients with congestive heart failure or poor peripheral circulation use lasix to decrease the swelling in the lower extremities. Lasix should be taken as prescribed to prevent lower extremity swelling so patients do not develop complications such as ulcers or cellulitis (bacterial infections of the skin).
You husband’s redness and swelling in the big toe could be a sign of localized swelling and inflammation due to him not taking his lasix for a few days. However, patients who experience these symptoms could also have gout, arthritis, or an acute injury. You should therefore it might be worthwhile for him to be evaluated by his doctor to rule out gouty attack or arthritis.