A nebulizer is used mostly on asthma patients. The machine is used mainly when someone is having an asthma attack. It helps the patient breathe more easily by opening up his or her lungs. Medicine is put in the cap of the nebulizer. After putting the medicine in, a mouth piece is put on the cap. The patient is to breathe out of his or her mouth into the mouthpiece to get the medicine once the machine is turned on. If the patient is very young and has trouble breathing through his or her mouth, the doctor will put a mask on the cap instead of the mouthpiece. With the mask, the patient can breathe either out of his or her mouth or nose. The medicine comes out in the form of cool flames. The treatment usually takes about 10 or 15 minutes. Different medicines are used on different people, and the doctor will prescribe the medicine right for you!