yeah I only ever buy cheapo Pholcodine its a cough suppressant so only "works" with unproductive coughs and its cheap as well.
The trouble with herbal stuff is that its not regulated in the same way as meds (if at all!) You can go in to Holland and Barret (or other such places) and buy a whole load of herbal (so obviously safe!) crap and you haven't a clue as to what damage it might do you if you take too much or in combination with an other herbal product or med.
Best stick to Crystals and Homeopathy to be on the safe side!