This book is a comprehensive guide to Targeted Drug Delivery (TDD), also known as Intrathecal Drug Delivery (IDD), and offers an overview to this unique form of treatment. The medication is delivered by intrathecal pumps and is less common than some other techniques for interventional pain management, but is essential in conditions such as refractory pain, cancer pain, multifocal pain, severe spasticity, and in patients who are not candidates for surgical correction of their underlying condition.