| abstract |
The present invention provides a drug delivery system that is a sustained drug delivery system targeting a tissue in the posterior segment of the eye accompanied by low degree of tissue invasiveness without need of frequent administration, and enables selective delivery of a drug to the posterior segment of the eye, thereby reducing influences due to transfer of the drug to the anterior segment. By administrating fine particles containing a drug to sub-Tenon, a drug delivery system enabling a drug to be selectively delivered to tissues in the posterior segment and an effective concentration to be kept can be constructed. |