From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. This medicine is also used to treat erectile dysfunction and signs and symptoms of BPH. Tadalafil can be synthesized starting from D – tryptophan methyl ester and piperonal via a Pictet—Spengler reaction. Benign prostatic hypertrophy is a condition in which the prostate gland becomes enlarged, obstructing the free flow of urine.Tadalafil’s effect on sexual ability may last up to 36 hours. The second way to treat ED is to take tadalafil regularly, once a day every day. If you take it this way, you may attempt sexual Missing: samples. Cialis (tadalafil) is a prescription medication for those with erectile dysfunction. Many providers sell Cialis online — learn about the safest and most discreet providers here. Tadalafil (Cialis) is a phosphodiesterase-5 enzyme (PDE-5) inhibitor. It works by blocking PDE This is a protein in your body that breaks down the molecules that normally cause an erection. When it blocks PDE-5, tadalafil (Cialis) helps an erection occur by allowing certain muscles in the penis to relax and the penis to fill with test1.rug: samples.