Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. If you have symptoms of an enlarged prostate gland, such as difficulty peeing or needing to pee urgently, tadalafil works by relaxing the muscles in the prostate and bladder. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. It affects the way the medicine works. Finding an online ED provider can feel overwhelming. Yes, ED pills can cause side effects.Vision changes. Muscle pain. But there are some differences. With Viagra, there is a higher risk of vision changes than with Cialis. Among people who take Viagra or sildenafil, 3% get blue vision that lasts a few hours. On the other hand, Cialis has a slightly higher risk of muscle pain than Viagra and vardenafil. Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your individual plan. AdLearn the truth about male enhancement and how to achieve optimum results naturally. Male UltraCore is the #1 Rated premium male enhancement pill for maximum resultsIndustry Leaders · Watch Video · Fully Equipped · Custom Formulation.