Medicinal chemistry is an interdisciplinary field of study combining aspects of organic chemistry, physical chemistry, pharmacology, microbiology, biochemistry, as well as computational chemistry. Medicinal chemistry is concerned with the discovery, design, synthesis, and interactions of a pharmaceutical agent (drug) with the body.Medicinal chemistry is mainly concerned with small organic molecules both natural and synthetic. Compounds in clinical use are primarily small organic compounds. Organometallic compounds, biopharmaceuticals, and inorganic compounds are also used in medicine as therapeutics.It deals with the design and synthesis of drugs or medicines based on an understanding of how these work in our body. Chemical substances of natural or synthetic origin which are used for curing diseases and reducing sufferings from pain are called medicines or drugs.