The active ingredient in Alli is orlistat, and alternatives to Alli include the prescription medications Xenical and lorcaserin. These weight loss products work by reducing the appetite, and that reduction combined with exercise produces weight loss, explains Drugs.com.
As another weight loss alternative, rimonabant has demonstrated the ability to reduce weight by 4.7 kilograms as compared to patients given a placebo, although the drug does increase the risk of depressive symptoms The Lancet reports.
Qsymia is an alternative to Alli that is available with a prescription. It is taken in pill form, and it works by decreasing the appetite while at the same time increasing energy used by the body, according to the Qsymia website These weight loss supplements or prescriptions should be used in combination with consultation with a doctor and an exercise regimen, notes Drugs.com.