How do you get a prescription for viagra (sildenafil) or cialis? Which is better?

Ed drugs. While both drugs are similar, cali's has a longer half life and some feel that is an advantage. Both drug companies have generous sample programs for these costly meds....My advice is to be seen by your doc for ED and try each one....Then choose the one you prefer....But if you're ED is a new problem then see your doc first....Stop smoking and loose weight are better than meds for ED for many pts.