More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. This increase in blood flow results in a firmer, longer-lasting erection. Be sure the one you choose works in your state. But you also deserve to do that safely. Methodology We researched 19 online platforms for erectile dysfunction treatment to learn more about the process of ordering ED pills online.Here’s what to look for when you buy ED drugs online: A licensed pharmacy with an address in the U.S. (Check with your state board of pharmacy or the National Association of Boards of Pharmacy.)Missing: levitra. Vardenafil (Levitra): Uses, Alternatives, Side Effects & More – GoodRx feeling faint or weak, dizziness, blurry vision, feeling confused Erection lasting for more than 4 hours Headache (up to 15%) Flushing (up to 11%) Stuffy nose (up to 9%) Indigestion (up to 4%) —skin rash,, swelling of the face, lips, tongue, or throat. Pros & cons More options Takeaway Galina Trushina / Getty Images Levitra (vardenafil hydrochloride) is an oral medication taken to treat erectile dysfunction (ED). It’s in the same class of drugs.