Alli products are available at Walgreen's, CVS, Rite-Aid, Walmart and Target, as of 2105. They are also available for purchase through online retailers such as Amazon.com and Drugstore.com, according to Alli's website.
Alli is an over-the-counter weight loss drug approved by the U.S. Food and Drug Administration, states the manufacturer. It is also available by prescription in a stronger dose under the brand name Xenical, states WebMD. Alli is not a stimulant or an appetite suppressant capsule. Instead, it blocks about 25 percent of the fat ingested. Alli increases weight loss results by 50 percent, so for every two pounds a person loses on his own, Alli increases this to three pounds, according to its website. Users of Alli are still required to eat a low-fat, low-calorie diet for the drug to work.
Because Alli blocks the intestines from absorbing the fat, some side effects include loose, oily stools, excess flatulence and stomach cramps, warns WebMD. These side-effects increase when one eats a particularly fatty meal.
Users take Alli three times a day, once before each meal that contains fat, or up to one hour after eating.
Those using Alli should take vitamins, especially vitamins A, D, K and E, advises WebMD. These vitamins are hard to absorb without an adequate amount of fat in the bloodstream.