Vilitra 20 mg contains vardenafil 20 mg, a PDE5 inhibitor. It can occasionally cause visual changes because vardenafil can also inhibit PDE6, an enzyme involved in light detection in the retina. D DailyMed +1 Possible effects include: Temporary changes in color perception, especially a blue/green tint. Blurred or altered vision, light sensitivity, or eye discomfort. These effects are generally temporary and are most noticeable around the time the drug reaches its peak concentration. D DailyMed More serious eye problems are rare, but Vilitra 20 mg vision loss has been reported with PDE5 inhibitors, including vardenafil. If you experience sudden loss or significant reduction of vision in one or both eyes, stop taking it and seek urgent medical attention. D DailyMed Also, 20 mg is the maximum recommended vardenafil dose, and it should not be taken more than once a day. D DailyMed If you're asking because Vilitra 20 is causing a blue tint or blurred vision for you, tell me what you're experiencing and how long after taking it the symptoms start.