Why are certain drugs called enzyme inhibitors?

Explanation

Enzymes have active sites which bind the substrate for carrying our chemical reactions rapidly and effectively. The functional groups present at the active site of enzyme interact with functional groups of substrate involving ionic bonding, H-bonding, van der Waals interactions, etc. Some drugs interfere with this interaction by blocking the binding site of enzyme and prevent the binding of actual substrate with the enzyme. This inhibits the catalytic activity of the enzyme and the drugs which inhibit the catalytic activity of enzymes are called enzyme inhibitors.