Floppy Iris Syndrome

I had been taking Doxazosin for BPH and switched to Alfuzosin prior to cataract surgery, to try to avoid Floppy Iris Syndrome. The operation went smoothly and I did not have that syndrome. However, I am now looking forward to my second cataract surgery and I want to switch back to Doxazosin, which is more effective. Do I still run the risk of Floppy Iris Syndrome, or have we proven that I will not get it? Or should I not switch back to Doxazosin?