When prevention fails, medicinal treatment of obesity may become a necessit
y Any strategic medicinal development must recognize that obesity is a chro
nic, stigmatized and costly disease that is increasing in prevalence. Becau
se obesity can rarely be cured, treatment strategies are effective only as
long as they are used, and combined therapy may be more effective than mono
therapy. For a drug to have significant impact on body weight it must ultim
ately reduce energy intake, Increase energy expenditure, or both, Currently
approved drugs for long-term treatment of obesity include sibutramine, whi
ch inhibits food intake, and orlistat, which blocks fat digestion.