Cialis (Tadalafil) is the medication which is used for treatment of the erectile dysfunctions (impotence) in men. Impotence is the inability or serious difficulty to get and maintain erection which will be strong enough for sexual act. Its causes can be different, like physiological or psychological disorders, bad habits or style of life, depression, stress and so on. Fortunately, the erectile dysfunction can be not only relieved but also treated. And Cialis is one of the most spread and common medications used for relieving this problem. It is proved to be well-tolerated and safe. At the same time, there are some health conditions that may not allow you to take Tadalafil or may require special dose, established by your doctor. So, if you have ever had or have any of the following, you may be not allowed to take these pills or will need individual dosage: kidney or liver problems,blood cell problems,heart problems, stroke, l ow or high blood pressure, a deformed penis shape, retinitis pigmentosa, an allergy to Cialis, Tadalafil or any other component of the medication, an erection for more than 4 hours,severe vision loss. This list may be incomplete, that is why you should better share with your doctor your health condition. After this, you can order Cialis either by Cialis prescription or online, on special pharmacological websites.