It is a department concerned with teaching the theoretical and scientific foundations of the effect of drugs and chemicals on cells, tissues and the entire body. And studying their beneficial and harmful effects, with the aim of improving the way drugs are tested and giving the greatest benefit in treating disease. Also, pharmacology is the basis of much research and development of new drugs. As for toxicology, it is closely related to pharmacology, but it specializes in studying the harmful effects of drugs. and other chemicals on biological systems.