Sildenafil citrate Cas No.: 171599-83-0 What is sildenafil citrate? Sildenafil citrate is a drug in the phosphodiesterase type 5 inhibitor group. Such compounds are primarily associated with potency drugs – this is their main use. It is sildenafil citrate that is the active compound contained in the famous blue pill, or Viagra. This substance is … Continue reading Sildenafil citrate – how does it support brain function?