ABSTRACT
Since the advent of modern methods of treatment, drugs are administered in various dosage forms such as tablets, capsules, pills, creams, ointments, liquids, aerosols, injectables, suppositories, and so on to treat various diseases. Even today, these types of formulations are used as major pharmaceutical products. However, these conventional drug delivery systems (DDSs) may not provide maximum therapeutic responses always (Garg and Kokkoli 2005). The conventional type of dosage forms are required to be administered several times a day to achieve and then to maintain the minimum effective concentration of the drug at the site of action. This results in a uctuating drug level, adverse drug reaction, prior biodegradation of the drug, occurrence of drug toxicity, and patient noncompliance. Scientists are engaging in continuously developing new drug formulations to minimize those effects as effective tools against diseases (Garg and Kokkoli 2005). New generations of drugs are also developing due to improved knowledge of cellular biology
1.1 Introduction ......................................................................................................1 1.2 Classication of Targeted DDSs .......................................................................4 1.3 Approaches Involved in Drug Targeting ..........................................................4
