There's been a lot in the press recently about slimming pills and crash dieting with professional advice difficult to come by on the internet. From what I've seen, there are just as many sites offering bogus advice as those which offer proven medical facts and realistic advice.
Phentermine is a popular drug, particularly in the USA which acts as an appetitie suppressant. The name is short for phenyl-tertiary-butylamine and has proven to be effective for weight loss in obese pateients when combined with exercise and behavioural modification. But would it work for you?
I'd always recommend someone considering taking drugs like this to talk to their GP before making any serious decisions but a good starting point could be one of the many websites focussed on the Phentermine Diet. There are lots out there so be careful but ones like Consumer Price Watch are popular and probably one of the most relaible sources of info.