The most frequent generic Levitra effects are rather moderate and do not last long, for instance headache, facial flushing, stomach upset, indigestion, and dizziness. However, Vardenafil can lead to more serious adverse effects, albeit very rarely. These would include priapism (painfully long lasting erection), vision problems (blurry vision, color changes, sight loss) and hearing problems (hearing loss and ear ringing). The occurrence of any of those side effects calls for stoppage of generic Levitra treatment and medical attention.