Tadalafil (Cialis) is the medication that is used for treating male sexual dysfunctions like impotence or erectile dysfunction and is taken orally. How does it work? It blocks phosphodiesterase-PDE5 in the body that actually prevents blood from flowing into the penis and, thus, helps to achieve and maintain erection which is necessary for sexual intercourse. This is Cialis professional use, but Tadalafil can be also available in other brands for treating blood pressure problems. It may be not listed in the approved labeling of the drug, but still can be prescribed by your doctor. Yet, you shouldn’t start such treatment on your own or by recommendations of your friends. This must be done only if it is prescribed or recommended by your health care provider after the professional examination. You can order Cialis either by prescription or in the Internet by entering “Cialis online pharmacy”.  The second variant is very easy and comfortable as this will help you to see and compare the Cialis cost proposed by different websites and save some money by choosing the best variant. A very important thing that you should always take into account and bear in mind is that the information about the drug including the dosage, the way of use and precautions may be not enough for the right and safe treatment. That is why before you start the course or just take the pill, consult your health care provider. Discuss your health problems, tell about other medications that you take and allergy is there is any.