Clinical Research Organization are responsible for the clinical trials occurring at with different phases.Clinical trials are performed to test the effectiveness of a drug before it is sold in the market. Clinical trials identify the drug dosage, their side effects, long-term risks, benefits and the tolerance to the drug by an average patient. The clinical trials are also performed to improve the quality of the medicines available and to find newer treatment methods that could be efficient and beneficial. Many clinical trials are done to test if the new drug or medicine is safe and effective for people to use. Sometimes, they are done to check and compare with the treatments available and see which is better. The treatments followed now are termed as the ’standard treatments’. Sometimes the clinical trials are performed by changing these standard treatments and see how effective is the outcome.