http://www.medications.com/effect/view/40461 I am a 24 year old female. I got diagnosed with walking pneumonia after having a chest X ray at my doctors office. The doctor prescribed z-pak. I went home and took the first 2 pills and about 2-3 hours after taking it I suddenly experienced uncontrolled ra Wed, 10 Jun 2009 00:13:21 -0400 http://www.medications.com/effect/view/40461?item=20489 If you look at the posts on this board, heart arrythmia wasn't a very common side-effect until 2008-2009. I had a similar but more extreme reaction. Can you remember if you used the generic, or not? http://www.medications.com/effect/view/40461?item=20489