These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Doses should be taken at least 24 hours apart. This means that when you get aroused, blood flows more easily into the penis and you get longer-lasting, firmer erections. Contact your medical provider if you experience any side effects during treatment. Patients taking indinavir, saquinavir, atazanavir or other potent CYP3A4 inhibitors such as clarithromycin, ketoconazole mg daily, or itraconazole mg daily should not exceed a dose of LEVITRA 2. Have pulmonary hypertension.Based in Florence, Kentucky, is the leader in Digital Pharmacy and a pioneer in affordable healthcare, providing incredible patient services since Levitra is a medication used for the treatment of erectile dysfunction. Find out how it works, when it should be taken, and what side effects may occur, here. The most common side effects with Levitra are. headache, flushing, stuffy or runny nose, indigestion, upset stomach, dizziness or back pain. These side effects usually go away after a few hours. Call your doctor if you get a side effect that bothers you or one that will not go away. Levitra may uncommonly cause.  · Levitra® mit dem Wirkstoff Vardenafil unterliegt der Verschreibungspflicht. In Deutschland gibt es das Medikament also nicht ohne Rezept zu kaufen. Im Internet finden sich dennoch zahlreiche Angebote zu rezeptfreien Potenzmitteln, so auch für Levitra®.