Reductil is a drug that helps with weight loss. This drug contains sibutramine, which increases the levels of two chemicals in the brain called serotonin and noradrenaline, which can help you lose weight. This drug is useful for people with cataracts. To treat obesity, this medication must be taken along with diet and exercise. It works by regulating a person's appetite. Sibutramine increases chemicals in your brain that make you feel full, so you eat less and ultimately lose weight.