Whose Alli are you?

Alli is part of the drug Orlistat, but in a weaker dosage from its sister drug, Xenical. This drug has been around for quite some time, but I have not heard of complications extending from the use of Xenical. So why now, with Alli? Perhaps the marketing professionals are being more forthcoming in order to target a more mature audience? I wonder...does it really work?