Imipenem is combined with cilastatin to
Imipenems rapidly inactivated by renal dehydropeptidase I, so it is combined with cilastatin, an inhibitor of this enzyme. Cilastatin, a reversible inhibitor of dehydropeptidase, increases the half life of imipenem and also inhibits the formation of nephrotoxic metabolite. Meropenem, doripenem and eapenemare not metabolized by renal dehydropeptidase