I take a medicine called Vyvanse for ADHD and it was wondering if anyone else took it and experienced the same adverse sexual side effects as I do. While the medicine makes me incredibly horny all the time, my ability to perform steeply declines when I am on it. I find it very hard to maintain an erection on this medicine but when I am off it I have no problem at all maintaining one during intercourse. The curious thing is that it increases my sex drive but decreases my ability to preform. So does anyone else have the same problem with this medicine or and other types that treat ADD or ADHD?