Despite what any company may tell you, the best appetite suppressant is none at all. These pills even when subscribed by a doctor can be extremely dangerous, especially if you're experiencing any sort of medical problems. Most appetite suppressants are nothing more than a chemical that can cause damage to your body even if it's taken properly.
It's better to skip the pills, prescribed or not and control your appetite using exercise and willpower than take the easy way out of things. What's your opinion?