For example, an analgesic drug with a high therapeutic range can be of little use if it undergoes a rapid decomposition in the gastrointestinal tract and/or it fails to reach the general circulation and/or it is too irritating to be administered parenterally. Therefore, the final goal in the drug development process is to develop an optimal dosage form to achieve the desired therapeutic goals. The optimal dosage form is defined as one that provides the maximum therapeutic effect with the least amount of drug and achieves the best results consistently. In other words, a large number of factors play an important role in determining the activity of a drug administered through a dosage form. These factors have an important influence on the effectiveness of the drug.