They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. Common ones include: Flushing of the skin. Fact checked by Heather Mercer Print Many of us want the option of purchasing our prescription drugs from online drugstores because the practice seems convenient and money-saving. This boosts blood flow and helps you get an erection from sexual activity. Just be sure you use the correct address to access their prescription capabilities. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED.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* . 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 . Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems, including nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, and some .