Sildenafil, which is commonly known as Viagra is one of the most prescribed and used erectile dysfunction drug. It is important to understand that Viagra is not used to cure erectile dysfunction in men. It is indicated only with the purpose to improve erection in patients with ED. Sildenafil citrate – the active ingredient of Viagra can also be indicated for the treatment of pulmonary arterial hypertension.

The best place to buy Viagra online is definitely the websites of those companies that manufacture this drug. You can easily find many online pharmacy with Viagra where you can purchase the drug after providing Viagra prescription.

Since Viagra belongs to an Rx group of drugs, it requires to provide a valid prescription from a doctor. This helps avoid unauthorized usage of Viagra by patients whom viagra is contraindicated.