Alli is available online at Drugstore.com and Amazon.com and at pharmacies throughout the United States, including Walgreens, CVS, Wal-Mart, Rite-Aid and Target as of 2015, according to GlaxoSmithKline. The U.S. Food and Drug Administration approved the nonprescription weight-loss aid for adults to use in conjunction with low-fat, reduced-calorie meal plans.
Alli prevents the digestive system from absorbing approximately 25 percent of the fat a person consumes, which enhances weight loss, explains GlaxoSmithKline. For every 2 pounds of weight a patient loses, Alli helps the patient lose an additional pound. The medication does not impact the body's central nervous system or cardiovascular system directly because only a small amount enters the bloodstream.