The system of drug clinical trials has gradually become the basic pillar of pharmacotherapy principles denoted as evidence-based medicine. It serves, in particular, to ensure the efficacy and safety of newly introduced drugs.
The definition of drug clinical trials covers several basic factors, such as pharmacodynamics, pharmacokinetics, adverse effects, drug safety and efficacy and, in particular, testing systematicness. The clinical trial itself is carried out in four basic stages.
Each of them consists of a set of studies with rationally follow up one another.