I have recently started taking 5mg of Cialis daily. The results have been great, best erections in years. After a week I started experiencing horrible back pain, to the point where I couldn't hardly get up. it took a few days but I finally figured out it is the Cialis and it is a known side effect. I have quit taking it and the pain has lessoned every day. Has anyone experienced the pain and did it go away over time? I'll give it a few days and try again but hate to give it up because its working wonderfully. Any input would be appreciated, thanks.