Fast erection alkaloids  series---- second-generation phosphodiesterase5 (PDE5) inhibitor for the treatment of male erectile dysfunction. Erectile rapid (within 30 minutes of onset), 100-150mg/time , effectiveness can sustain 16-20 hours . Small side-effects. “sildenafil” side-effects is not obviously within the recommended dosage. And the products can meet and through the inspection all over the world . It tastes bitter, completely soluble in water and alcohol. It can be made to tablet, pill, hard and soft capsules, chewable tablets ,cofffee, medicinal liquor and other formulations.