It's the latest weight-loss pill or herbal supplement that has people talking and you wondering whether it really works. Certainly the appeal of losing weight quickly is hard to pass up.But do these pills and products lighten anything but your wallet? And are they a safe option for weight loss? Here's a look at some over-the-counter weight-loss pills and what they will and won't do for you.Types of Weight Loss PillsThere are two basic types of weight loss or diet pills: prescription pills and non-prescription pills.Prescription Pills - Weight Loss DrugsPrescription weight loss pills are like drugs. They are closely regulated and require FDA approval. Examples of such weight loss pills include Xenical (Orlistat), Phentermine/ Fentermine and Meridia (Sibutramine). These pills are typically subjected to a range of clinical tests to prove their effectiveness for weight reduction and to monitor side effects and health risks.    Three major categories for this are- appetite suppressants, fat burners and fat blockers. Although all of the mentioned are very popular, fat blockers are now available more easily and have gained enormous popularity in a short period of time. Xenical in particular has been very popular. Some have even referred this to be among the best weight loss pills ever. Xenical which is the brand name for Orlistat works by blocking a pancreatic enzyme called lipase and subsequently inhibiting fat absorption.So does Xenical live up to the mark of being considered among the best weight loss pills? Clinical studies have proven that Xenical works on varying degrees on different people, but it does work. The variation is determined by compliance, diet and exercise. In one year clinical trials between 35.5% and 54.8% of the subjects achieved atleast a 5% reduction in body mass. Upto 24.8% actually achieved atleast a 10% reduction in body mass!! The most impressive finding was the reduction of incidence of type II diabetes in almost 37% of the subjects. It was because of these findings that Xenical is considered among the best weight loss pills ever.As scientists start to tap into the earth and realize the possibilities that can come from it, we will start to see more natural organic products for our health start to come out. Luckily for those looking to lose weight quickly and keep it off there are products out there that work differently then prescription drugs. These herbal weight loss pills work WITH your body and help you lose weight and keep it off.Do Weight Loss Pills Work?Weight loss pills can be effective and sometimes it does not work. When these pills are used under the supervision of medical department along with the exercise program and proper diet, these pills are effective for the short term. The body is adapted to various weight loss pills, so it provides less benefit to the people.