HI,
I used to take atenol, but I asked my DR to change me to Lisinopril,
Many drugs are losing favor with the new cardiac Doc due to clinical studies. Its really hard for DR's
to understand the complex relationship of many types of med being prescribed at the same time.
remember most clincal trials are done on one class of med alone.

http://en.wikipedia.org/wiki/Atenolol

Doug