Recent heart or blood vessel problems. See if they have a recommended mail-order pharmacy you can use. They are found only online; not all of them are registered pharmacies and sell drugs legally, so buying from them is potentially unsafe. Have a licensed pharmacist on staff to answer your questions. Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Severe liver disease.Many online companies claim to sell Viagra without a prescription, but this is illegal. What many of these sites actually sell is counterfeit Viagra. It is worth noting that these kinds . Orders were placed from 22 unique sites claiming to sell Viagra manufactured by Pfizer. Tablets received were assessed for chemical composition. Results: No site . 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 .