More stimulants?
All appetite suppressants are stimulants to some degree, their sympathomimetic effects on the gastrointestinal system are what lead to reduced hunger. It would be very nice to have a sympathomimetic drug that is specific to the GI tract only, but for now it seems like ephedrine & amphetamines are the best options available.
The other way to control hunger is by keeping your stomach full of low/no-calorie foods, like green vegetables & fiber. Metamucil caught on to this and has been promoting their fiber supplements as "appetite control"