Just so you guys know, the active ingredient in Buckley’s is Dextromethorphan. The same cough suppressent in any cough medicine with DM in the name. 2 teaspoons (10ml) of Robitussin DM gives you the same amount of DM.
Granted, Buckleys has some other non-medicinal ingredients that may make it work better and taste like rotten ass when you first swallow it (like camphor and menthol) but you can get the same drug in other cough medicines.
I’m not saying don’t use Buckley’s. (I myself have a bottle of it in my desk.) I’m just saying that you can get the same drug in lots of other medicines if need be.