Hyaluronidases are a family of enzymes that degrade hyaluronic acid.
By catalyzing the hydrolysis of hyaluronic acid, a major constituent of the interstitial barrier, hyaluronidase lowers the viscosity of hyaluronic acid, thereby increasing tissue permeability. It is, therefore, used in medicine in conjunction with other drugs in order to speed their dispersion and delivery. The most common application is in ophthalmic surgery, in which it is used in combination with local anesthetics. It also increases the absorption rate of parenteral fluids given by hypodermoclysis, and is an adjunct in subcutaneous urography for improving resorption of radiopaque agents. Hyalurodinase is also used for extravasation of hyperosmolar solutions. Usually a 0.2 ml of the drug is injected around the area of extravasation. A total of 1 ml is used.
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