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Treatments Pharmacologic in Knowledge Evolving• 1 chapter

Iontophoresis

Finally, iontophoresis should be mentioned as a potent drug delivery system which could be suitable for different drug concepts, such as gene therapy, liposomeor nanoparticle-encapsulated proteins, or other drug molecules.18 Iontophoresis could be defined as an enforced penetration of charged molecules through a tissue border by applying an electrical field. Iontophoresis generally enhances drug delivery by two mechanisms: electrophoresis and electroosmosis. Iontophoresis is a noninvasive, well-tolerated and safe method. Ocular iontophoresis is classified according to the site of application of the low electrical current for a limited period of time into transcorneal, corneoscleral, or trans­ scleral iontophoresis. Transscleral iontophoresis appears to be more suitable for drug transfer to the posterior segment. The properties of the sclera (hydration, leakiness, low electrical resistance) make iontophoretic delivery feasible at low electric currents or voltages for agents such as nonsteroidal anti-inflammatory drugs, corticoids, immunosuppressive agents, and oligonucleotides. In vivo studies have demonstrated its therapeutic efficiency for antisense oligonucleotides in the model of endotoxin-induced uveitis.

A few ocular iontophoresis systems have been investigated recently: Ocuphor (Iomed), Eyegate II Delivery System (EyeGate Pharma), and Visulex (Aciont). These new devices are relatively easy to handle and avoid the adverse effects frequently observed in the past. Eyegate II Delivery System is the first that was used in patients. The iontophoretic technique has the huge advantage of being noninvasive in comparison to intraocular injection drug administration. Hence, the duration of drug action is less prolonged than with intravitreally injected controlled release systems. This could be surpassed in the future by combining iontophoresis with encapsulated drug transport vehicles such as nanoparticles or liposomes. Consequently the enforced and increased intraocular drug penetration resulting from iontophoresis could be combined with the effect of a slow, controlled and targeted drug release obtained by the liposome or other similar encapsulated drug vehicles.

Ocular pharmacology and drug delivery technology is currently facing tremendous challenges and opportunities. Nowadays, drug delivery techniques and pharmacological therapies are clinical routine treatments which, only a decade ago, appeared absolutely futuristic. There is no doubt that further new molecules and treatment strategies with new pathophysiological insights will culminate in a new revolutionary pharmacotherapy.

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