Acomplia, now available in Europe, is proving very effective (not a stimulant) for people maintaining losses of 10 to 20 pounds over time. It supresses food cravings, like the opposite of marijuana. Some users do become depressed and can't tolerate, but most can tolerate. This one is going to be big and will be available in Thailand in a year or so.
http://www.ukmedix.co.uk/acomplia/