Clenbuterol is a medicine used for treating asthma. But lately, it has been discovered to be used by people for weight loss. As it allows you to take in more oxygen supply easily, a person is able to workout longer. It dilates the air path of the person and increases the oxygen intake in the body. It also reduces blood pressure. After the use of Clenbuterol people did notice loss of body fat and gaining of muscle strength. But the effect lasts only for up to six days without the medicine. So if the steroid is stopped the effect is lost as well. Also, it is addictive in nature and therefore has been banned for use.