How much do you want to lose? What is your weight and bodyfat%? (roughly)
If you were to use a Clen/Winny stack, you could greatly reduce calories while on the stack, still have plenty of energy to workout, and burn the fat. The key is to take in fewer calories than you are expending. The greater that imbalance is, the faster you will lose weight. But even more important is to lose more fat and retain muscle.
However, like bushboy said, the drugs are not going to do anything for you unless you are willing to sweat for it. The drugs can only help. You have to bust ass for what you want.