Hi TAVARESM79,
Alli, the 60mg orlistat formulation, is intended for over-the counter use.
Zenical, the 120mg orlistat formulation, requires a prescription.
One dose of Alli will block about 25% of the fat with minimal treatment effects, while the 120mg dose blocks about 35% of the fat with a doubling of the risk.
Sophia De Monte RPh