The pharmacist said a generic metoprolol extended release is now in the market because the patent
for Toprol XL has expired
. He showed me the difference between the regular generic metoprolol and generic extended release (succinate, I think). I tried the generic version for several days. It was supposed to be seamless but I felt weird with the generic. It didn't seem to have the same potency as the real Toprol XL. I got some dull neck pain from time to time.