Single-ingredient options like sildenafil or tadalafil work through one mechanism. Complete Tabs pair sildenafil with papaverine — a vasodilator — to support erections two ways, and add oxytocin to address arousal and intimacy, the parts of the experience a standalone ED pill doesn't target. The formulation is designed for men who haven't gotten the results they want from a single-ingredient ED medication, or who want to address erection, arousal, and intimacy together.