Adipex (phentermine hydrochloride) is a 37.5 mg immediate release version of Phentermine Hydrochloride and is the most popular form of brand name Phentermine prescribed today. Adipex is white with blue specks. The Adipex pill is oblong, scored on one side, and labeled Adipex on the reverse. Adipex is an appetite suppressant that is commonly used in conjunction with diet and exercise to reduce weight.

Diethylproprion is the generic form of Tenuate. Diethylproprion is used as an appetite suppressant. Diethylproprion is used in conjunction with an overall diet plan to reduce weight.

Ionamin (phentermine hydrochloride) is set in a resin matrix compound and is manufactured by Medeva Pharmaceuticals. The resin compound in Ionamin allows the phentermine to release slowly into the system, but is not time-released per se. Some patients like Ionamin because they have fewer side effects. Ionamin is the only phentermine resin on the market; there are no generics.

Meridia (sibutramine hydrochloride monohydrate) is an FDA-approved oral prescription medication that is used for the medical management of obesity, including weight loss and the maintenance of weight loss. Meridia works by affecting appetite control centers in the brain.

Phentermine is a sympathomimetic amine. Phentermine stimulates the central nervous system (nerves and brain), which increases heart rate and blood pressure and decreases appetite. Phentermine comes in 15 mg & 30 mg capsules and 37.5 mg tablets. Being generic, Phentermine is typically less expensive than its commercially available name brands Ionamin and Adipex.

Tenuate (diethylpropion hydrochloride) is a sympathomimetic amine. Tenuate is also known as an "anorectic" or an "anorexigenic" drug. Tenuate stimulates the central nervous system (nerves and brain), which increases your heart rate and blood pressure and decreases your appetite. Tenuate is used as a short-term supplement to diet and exercise in the treatment of obesity.

Xenical (orlistat) is a weight loss medication that inhibits the absorption of fat in your body rather than suppressing your appetite. Xenical is useful for long term use and has been shown to be effective for 1-2 years. Dietary fats are inhibited from being absorbed by using Xenical and this allows about 30% of the fat eaten in a meal to pass through the digestive tract undigested. Xenical helps to reduce and maintain your weight, as well as to minimize any weight regain.