Because they are specifically created to demonstrate efficacy, therapeutic efficacy, tolerability, and pharmacodynamic features, clinical trials are also known as pharmacological trials. Clinical trials are conducted through a number of stages. A clinical trial is a technique for testing new medications to see if they are both safe and effective. The entire process of creating a new drug, from drug discovery to FDA approval, typically takes at least ten years and costs $2.6 billion. FDA approval rates for potential drugs that enter Phase I clinical trials are less than 12%.

Keywords : Clinical Research Methods, Clinical Trial Methods, Statistics In Clinical Research.