A common name for drug design is rational drug design or just rational design. The study of molecule shape is defined as figuring out how molecules adhere to cell receptors or connect to other molecules to trigger a certain reaction .It is supported by Instead of blindly evaluating hundreds of molecules to discover if one or more of them bind cellular or molecular targets, one might use the shape or architecture of the molecules themselves. The drug is an organic substance. When a biomolecule attaches to the target site, it can either inhibit or increase the activity of the biomolecule, producing a therapeutic effect. Development of drug is an very complex process which can take up to around 5-10 years and cost $1.8 billion.