Sildenafil Citrate is a medication used to treat erection issues (erectile dysfunction). Sildenafil is sometimes used to treat aspiratory hypertension (hypertension in the veins that supply the lungs). If you have erection issues, sildenafil works by briefly expanding blood stream to your private area when you get physically invigorated. In pneumonic hypertension, it works by loosening up veins in the chest. Suppose you purchase sildenafil for erectile dysfunction. Sildenafil for pneumonic hypertension can be called by the brand name Revatio. This medication is accessible on remedy, and you can get it from most pharmacies. It comes as standard tablets, chewable tablets, and fluid you swallow.