The most common method of medical therapy is the administration of drugs. Billions of dollars are spent annually on the development of safer and more effective medicines. Considerable efforts are also made in enhancing the methods used to deliver these drugs. Commonly medicine is delivered to the body through pills, inhalers and injections. Goals in finding new delivery methods include: reducing systemic effects on the body, increasing localized effects, reducing the need for needle injections and minimizing the burden for those who need regularly administered drugs, such as diabetics.