*In silico* **screening**

This is the most advanced technique for drug discovery. It entails virtual screening or docking of compounds on the 3-D- structure of a known receptor based on homologies of the test drug molecules with a known test parent drug. *In silico* screening can form a basis for the modifi‐ cation of a known drug molecule to determine possible therapeutic applications and may lead to the development of putative drugs against new targets.
