A_520 - In the development of drugs, it is important that they are tested periodically both before and during marketing, on people of both sexes when not specific for one sex, of different nationalities, ethnicities and with different diets and lifestyles, to correctly evaluate their effects and impact. So as with software, even with drugs, the modification of external environmental factors can alter their functioning. The test results are also useful for facilitating the use of the drug for various types of people and optimizing its use.