Why are some molecules called bioactive molecules?Give two examples of such molecules

The molecules that can be have an effect on a living organism are called bioactive molecules.
Examples of bioactive molecules are:
(i) Cyclosporin-A: It is used as an immunosuppressive agent in organ-transplant patients.It is produced by Trichoderma polysloprum.
(ii)Statins: Statins are produced by the yeast Monascus purpureus and have been commercialized as cholestrol-lowering agents.