First: cocaine is a stimulant and has no sedative effects. If you're gunna talk drugs talk, at least name the right ones. Any of the benzodiazapines would have been a good choice, along with some of the antihistamines. The opiates too are pretty sedating, and alcohol is the most commonly used of all.
Second: Drugs talk is bad!
So hush with that, foo'!
Edit:
Also, a lot of antipsychotics (such as haloperidol, clozapine, chlorpromazine) are sedating, which is why they were called the Major Tranquilizers for many years until they realised that in the public mindset, tranqs were something you shot into lions with a dart gun, and not sick people.
Edit2:
Whisky does this to moderators, guys... it makes them cranky and pedantic and weird, and the effects can only be counteracted with pizza. Mmmm, pizza.