An<unk>  is a drug that inhibits one or more<unk>  enzymes.<unk> s are one of two types of proteases (enzymes that break down proteins and peptides), the other being endopeptidases.<unk> s cleave peptide bonds of terminal amino acids, resulting in the release of a single amino acid or dipeptide from the peptide chain, whereas endoeptidases break non-terminal bonds (that is, they cut proteins/peptides into two chains). Some examples of<unk> s include amastatin, bestatin (ubenimex), puromycin, 1,10-phenanthroline, D-phenylalanine, ACE inhibitors, DPP-4 inhibitors, and exogenous MMP inhibitors like batimastat and marimastat. Various enkephalinase inhibitors, such as ketalorphan, spinorphin, and tynorphin, are mainly<unk> s.
Exopeptidase inhibitor
Endopeptidase inhibitor
Protease inhibitor 
Xanthine oxidase inhibitor
Topoisomerase inhibitor
Monoclonal antibody
CETP inhibitor
Antimetabolite