It reduces tissue hyperemia, edema, and nasal congestion commonly associated with colds or allergies.
From the en.wikipedia.org
The drugs worked by preventing post-exercise hyperemia, an increased flow of blood, in the skeletal muscle during the critical 90-minute recovery period after exercise.
From the sciencedaily.com
In rats, inhalation of yttrium citrate caused pulmonary edema and dyspnea, while inhalation of yttrium chloride caused liver edema, pleural effusions, and pulmonary hyperemia.