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Patients with ED report great success with Viagra, Levitra, and Cialis. All three drugs have been approved for the treatment of ED by the Food and Drug Administration, and are available through a regular or an online pharmacy. The NIH cites a wide range of conditions that account for almost three-quarters of reported cases of ED. Diabetes, kidney disease; chronic alcoholism, multiple sclerosis, atherosclerosis, vascular disease, and neurologic disease are common causes of ED. Viagra works at treating erectile dysfunction in the first place,by blocking two specific enzymes in the body, known as PDE5 and PDE6, which exist throughout the penis. Viagra (Sildenafil), also known as “The Blue Pill”, is available in 25mg, 50mg and 100mg pills. Viagra can be taken once per day, between 30 minutes to 4 hours before sexual intercourse.

Viagra, Levitra, Cialis or some other ED treatment drugs like Kamagra, Silagra, Zenegra or Caverta all work in the same principle i.e. increase blood flow to the penile tissues. After the infusion of any of these drugs in a patient’s body, upon sexual arousal, blood flow to the penile tissues increases which helps one get penile erection and maintain it. Kamagra, Silagra and Caverta contain same active component - Sildenafil citrate - as Viagra.