To understand the concept of clinical trials, read the following procedure that has been divided into four phases. To make a treatment eligible for approval, it is essential that the first three phases are successful.
This phase evaluates the efficacy of the intervention in a bigger group of people, which can be up to several thousand people. Here, comparisons are made against other similar treatments for the identical condition, while observing for objectionable effects. Once the study is completed in the third phase, regulatory approval can be received for the drug or a specific therapy so that it can be used in clinical practice. Sometimes for regulatory approval, more than one third phase study is required.
Once a new drug or treatment has received regulatory approval and it is allowed to use, further research and studies are performed to analyse the effectiveness and gather more information to check if there are any objectionable effects. Late third and fourth Phase studies are often compared to see how successfully it’s working.
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