Psychological factors like stress, depression, or anxiety can also contribute. This boosts blood flow and helps you get an erection from sexual activity. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Finding an online ED provider can feel overwhelming. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED.You can buy it under its generic name or under the brand names Levitra and Staxyn. Vardenafil is FDA approved to treat erectile dysfunction (ED). It works by allowing more . Viagra and Cialis are the most popular ED (erectile dysfunction) drugs in the world, but they’re not the only ones. They’re equally safe and effective, but they differ a bit in how . Levitra (vardenafil hydrochloride) is an oral medication taken to treat erectile dysfunction (ED). It’s in the same class of drugs as other popular ED medications, including Viagra .