I was thinking extra coffee/caffeine would also be your best choice.
Meridia was designed for medically obese patients who usually do not move much. It will prob take away too much appetite, as in you prob wont be able to eat more than 2 bites a meal. Its a bit extreme.
Ive heard dexatrim or citramax.. but never tried.
you can also take a fiber sup which could fill you up a bit more, or some flax oil.