A method for treating a patient suffering from a condition with an active compound comprising the steps of (a) treating the patient intranasally with an effective amount of MMP-9 or a functionally equivalent fragment, wherein the tight junctions of the patient's nasal epithelial cells are modulated or wherein the basal lamina of the patient is partially digested and type IV collagen of the patient is degraded or wherein access to the patient's perineural, perivascular, or lymphatic compartment spaces is facilitated and (b) treating the patient intranasally with an active compound is disclosed.
