Like all other ED drugs available, Cenforce 100 sildenafil citrate requires a prescription. ED medications are classified as restricted substances because to their nature. They are very different from one another even if they take on different guises and incarnations. Any medication can have the intended results if taken as directed by a physician; nevertheless, even branded drugs can have serious side effects if self-decisions are made about the kind and quantity of prescription. Therefore, it is important to discuss it with a doctor.