I hate to worry you with it Icon, but have you checked if Zyban is an allowable drug for an Australian pilot. It used not to be!
I honestly do not know, I don't even know where to go to look for it (can someone provide a link).
It doesn't matter because due to some mild side effects which are a bit weird I choose not to fly while on it, I only have a couple of weeks to go on the course, then I was hoping to get back in the air with a fresh medical, but I don't see it happening so smoothly.
I thought the fact the DAME prescribed it during my aviation medical examination would mean its ok. The regs do say check with your DAME before flying with any meds right.