• If you are under 18. • If you are pregnant or breast-feeding. • If you are taking ciclosporin, used after organ transplants, for severe rheumatoid arthritis and some severe skin conditions. • If you are taking warfarin or other medicines used to thin the blood. • If you are allergic (hypersensitive) to orlistat or any of the ingredients of alli: see Chapter 6 for further information. • If you have cholestasis (condition where the flow of bile from the liver is blocked). • If you have problems absorbing food (chronic malabsorption syndrome) diagnosed by a doctor.