Finally, we checked customer reviews to better understand user experiences with each platform. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. Tadalafil Cialis. Common ones include: Flushing of the skin.Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available as mints or pills. Prices range from $3 to $ per dose or $82 to $ for a monthly supply, depending on the medication. Take pills that help you get an erection. These pills are called PDE-5 inhibitors. They include sildenafil (such as Viagra), tadalafil (such as Cialis), and vardenafil (such as Levitra). Check with your doctor to see if it’s safe for you to take one of these medicines with your other medicines. These medicines all work well for ED. 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. Generic versions of sildenafil, vardenafil and tadalafil are available.