I have been taking efexor XL for about 2 weeks now. I was put on 75mg one a day capsules. I was also curious after doing some research and finding out that there was another called efexor XR.
I'm about 80% sure that XR is the latest drug produced by Wyeth, and I'm 100% sure it stands for Extended release.
As for XL, I'm still trying to find out what it stands for, and also what the differences are, between the two.
Will be sure to let you know when I find out.