Fast way to lose weight through medicine?

Hi , due to a sudden change of plans , i will be getting married in January 2007, as a result i now have to lose about 10 - 15 kgs. I reside in India and live a busy life. i would highly appreciate it if some one could prescribe any medicine available in India that would help me get rid of this weight fast without any side effects. I dont have time to go to the gymn but do situps every day. Please help me , i dont wanna look like a hippo in my pretty white wedding dress.