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Sildenafil is meant to relax muscles ensuring an increased blood flow in certain areas of the body. Sildenafil is the generic name of Viagra. This drug is effective for erectile dysfunction treatment. There is also another brand name of sildenafil – Revatio – that is prescribed to treat pulmonary arterial hypertension and to improve exercise capacity both in women and men. In some cases sildenafil is used for other purposes as well.

Vardenafil is meant for muscle relaxation. This compound also causes an increase of the flow of blood to definite areas of the body. Vardenafil is effective for treatment of sexual disability (known as erectile dysfunction or impotence) in males. Besides, vardenafil can also be taken by patients having other symptoms.

Tadalafil is used to relax muscles of the body and to increase the flow of blood to certain areas. Tadalafil is effective for erectile dysfunction treatment (i.e. impotence treatment). In some cases tadalafil is used for other purposes than those mentioned here.