Fiona is a medical advisor working for US HEALTHCARE and has an experience of over seven years in the company. He does practical researches on various medications that help in the treatment of multiple dysfunctions in a body. Currently, John is studying cures and medicines for Erectile Dysfunction. He is digging deep into the ingredients of Levitra 40mg, which is an effective cure for Erectile Dysfunction and is also approved by the FDA. John mentions that Levitra 40 functions in the body by improving the blood flow, which is then channeled towards the penis to form an erection on sexual stimulation. He suggests taking these pills without mixing it up with alcohol and at least 30 minutes before sexual activity.