I'm a big believer in eating right for your type. And since I don't know your type, I'll offer a quick couple of suggestions. You can go the way of the diet pill, but they have long ranging side effects down the road. Any drug that messes with the neurotransmitters of your brain can be a problem later on. Many of today's depressions are linked to drugs taken earlier in life, such as diet pills, high blood pressure drugs, etc. If you have blood pressure issues you'll want to stay away from diet pills, including ephedra.
Anyway, I lost 50 pounds the first 3 months and 3 pounds more or less every week for a total loss of 120 pounds in 10 months by doing the following:
1200 calories a day of lean meat, green veggies, only 2 fruits, no dairy, bread, or sugar. This sounds rather odious, BUT....the secret ingredient is amino acids taken in the form of high protein drinks. They absolutely kill the hunger pangs, and enable you to stay merrily on a low calorie but nutritious diet till the weight is gone. I have 3 fruit drinks during the day, and a hot mocha at bedtime. I sleep well, and never crave anything or feel deprived. Two disclaimers though...1.) a friend tried it and hated it. Turns out she did better on a lesser protein, more vegetarian diet. 2.) If you do it properly, the cost of the drinks might be more than you are willing to pay. But I gladly pay it, for it is a true miracle for me. It is the ONLY way that has ever worked for me. When you get to the weight you want, you add the calories back in, and if you want to discontinue the drinks, take amino acid capsules, especially L-Glutamine, which conquers the sweet tooth.
Hope this helps some. I have an aversion to diet pills such as phentermine, as they left me with unwanted problems. Good luck.