But is it legal and safe to purchase drugs from a pharmacy site? Kidney disease that needs to be treated with dialysis. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. A real pharmacy will always need to know your prescription. Many online pharmacies may also be unregistered.Q&A. Drug Images. What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with . Yes, it can be legal as long as certain rules are followed. Whether or not it is legal to purchase your prescription drugs online depends on various factors: your location, the . Orders were placed from 22 unique sites claiming to sell Viagra manufactured by Pfizer. Tablets received were assessed for chemical composition. Results: No site .