Question: are lisinopril and fosinopril the same?
Answer: Lisinopril, like enalapril, contains pyrrolidone ring of proline, whereas fosinopril contains a bicyclic ring that accounts for its higher lipophilicity. Fosinopril which is more lipophilic exhibits a plasma protein binding of more than 90% whereas lisinopril which is least lipophilic exhibits minimal protein binding.