Viagra (Sildenafil) is used to treat erectile disorder (impotence; inability to get or hold an erection) in guys. Sildenafil (Revatio) is used to enhance the potential to exercising in adults with pulmonary arterial hypertension (PAH; excessive blood pressure in the vessels wearing blood to the lungs, inflicting shortness of breath, dizziness, and tiredness). Children must not normally take Viagra, however in some instances; a health practitioner might also decide that sildenafil (Revatio) is the first-class remedy to treat a infant's circumstance.