Reductil icon images for your medical websites. Reductil is an appetite suppressant that is used as a weight control medication. It is indicated for the management of obesity. Reductil works by blocking the nerve cells that release and reabsorb serotonin, thus increasing serotonin levels. The increased serotonin acts in the brain and enhances feelings of fullness so that you eat less. By eating less, you consequently lose weight. This medicine can help you reduce weight or maintain a lower weight by suppressing your appetite. Reductil should be prescribed only for individuals who have attempted seriously to lose weight by diet, exercise, and other behavioural modification.