Stop trying to source, really. If you're trying to be funny, you're not. Keep it serious. We have a social thread in BDD and tons of other social threads throughout BL if you want more light-hearted conversation.
That Robitussin looks like an extended-release formulation of DXM. If DXM is listed as the only active ingredient than it is the same old DXM you're used to, only its released over a longer period of time. I'm going to edit the link out of your post, OP.
I'm going to go ahead and close this because it doesn't really fall into the BDD guidelines and is a pretty open and shut case.