Levitra side effects can include:
Flushing (redness or warmth of the face, neck, or chest), headaches, stomach upset, diarrhea, flu-like symptoms (such as stuffy nose, sneezing, or sore throat), memory problems, muscle or back pain, nausea, low blood pressure, dizziness, blurred vision and changes in color vision, abnormal ejaculation, and prolonged erections (priapism).
More serious Vardenafil side effects:
A painful or prolonged erection lasting 4 or more hours, sudden decreased vision (including permanent blindness, in one or both eyes), a sudden decrease or loss of hearing, sometimes with ringing in the ears and dizziness.
If any side effects become unmanageable speak with your doctor or pharmacist for help in additional treatment. For any serious side effects speak with your doctor right away for further treatment options.