Phentermine is high effective diet pill which generally suits to the patients above the age of 18 years. Obese with body mass index 30 or higher than that can use Phentermine however the doctor in some cases may prescribe Phentermine for the people with body mass index 27.

Developed in the 1950's, Phentermine gained approval from the FDA in 1959 as a short term slimming aid, and has been used by thousands of dieters in the last 45 years. Useful especially for people who have difficulty in losing weight because of a sluggish metabolism, it has revolutionised the experience of dieting, turning a long and often frustrating battle into a fast and reasonably pleasant process.

Xenical diet pill is a FDA approved prescription diet pill manufactured by Roche Laboratories.

It is a weight loss drug which works differently than other. While others diet pills such as Meridia, Phentermine and Acomplia act in the brain to suppress appetite, Xenical act in the stomach to stop the absorption of fats.

The Xenical principle of action for is different than other diet pills and is not an appetite suppressant. So, the side effects associated with these pills are also different.

In the U.S. alone, approximately 70 million people are obese, which directly or indirectly contributes to about $100 billion in healthcare costs and 300,000 deaths annually. In the U.S., obesity as a leading cause of preventable death is exceeded only by cigarette smoking. Because it increases the risk of other chronic diseases including atherosclerosis, coronary artery disease, diabetes, sleep apnea, respiratory problems, osteoarthritis, hypercholesterolemia, and some cancers, obesity demands a continued search for effective treatment.

Currently approved anti-obesity drugs include lipase inhibitors which reduce fat absorption, such as Xenical (orlistat), anorectics or appetite suppressants, such as phentermine and Meridia (silbutramine), a serotonin and noradrenaline re-uptake inhibitor. Other medications approved for other indications used off-label for obesity include Wellbutrin (bupropion), Procyglem (diazoxide), Tenuate (diethylpropion), Glucophage (metformin), Revia (naltrexone), Bontril (phendimetrazine) and Zoloft (sertraline).

The weight loss drug category may soon accept another member - Qnexa. The experimental drug showed impressive results in they're latest trials, as they're accredited with helping obese person lose up to 15% of their body weight without getting severe side effects often seen with other weight loss drugs.

Qnexa is a combination of two drugs that have already been approved for market: phentermine (Adipex), which is a commonly prescribed drug for weight loss and topiramate (Topamax), which is used to treat migraine and epilepsy. It has been formulated to be taken once daily.

Diet pills

available in several variable forms, including prescription drugs, over-the-counter drugs and herbal supplements.