I was on Toprol XL for a little over a year with no bad side effects. My insurance co decided they didn't like Toprol any more and quit paying for it. I've been taking so-o many different meds since then. I am now taking Linsinopril (40mg) and Toprol XL (100mg) and everything seems to be going wonderful! I will be conscious of the side effects and keep a look out for them, hopefully I won't see them! So far I like Toprol XL WAY BETTER than Diltiazem (Cartia, Cardizem)!!!!