tadalafil tadarise 40 mg is an erectile dysfunction drug that treats the problem of erections and makes men sexually fit and strong. The medicine is available in various strengths and dosages at leading drugstores, online pharmacies and medical supply stores. This medication is a member of a group of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increase in blood flow causes an erection.