Hyperosmotic agents quickly reduce pressure by lowering the fluid volume inside the eye to serve as an emergency treatment or before surgery. They are administered either orally or intravenously, and the effect is temporary, so they are not a substitute for other treatments.
Side effects may include fluid and electrolyte imbalance, dry mouth, metabolic acidosis, electrolyte loss, urinary retention, peripheral edema, headache, blurred vision, nausea or vomiting, hypotension, and tachycardia.

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