Progress of Preparation Method of Solid Implant

Implantable drug delivery system (IDDS) is a type of sustained and controlled release preparations which act on the lesion sites directly through in vivo implantation or subcutaneous injection. The methods and processes of its preparation are various, so the preparation methods of solid implants are classified and the characteristics of them are reviewed according to the existent documents, which provides a reference for the preparation and application of solid implants.