I have been taking Norvasc (5mg) for over 5 years and never had problems with controlling my blood pressure. The doctor wants to change it to Benicar to protect my kidneys. I have read so many negative side effects of Benicar and lisinopril that I don't want to change. Benicar is much more expensive and I know my insurance is going to change to lisinopril to save money. Any thoughts on keep using norvasc?