Side effects Headache, flushing, stuffy/runny nose, or dizziness may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may also occur.The medicine can help achieve an erection when sexual stimulation occurs. This rare side effect has also occurred with Viagra and Cialis, although only a tiny number of users are affected. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. This could potentially be a sign of non-arteritic anterior ischemic optic neuropathy NAION — a condition in which damage to the optic nerve causes permanent loss of vision, to some degree, in either one or both eyes. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. · The Most Common Side Effects of Levitra. Headaches. Headaches are by far the most common side effect of Levitra. In fact, headaches are the most common side . Common side effects of Levitra include facial flushing (reddening), headaches, stomach upset, diarrhea, flu-like symptoms, and nausea. Serious side effects of Levitra include . Common ones include: Flushing of the skin. Headache. Upset stomach. Visual changes, such as blue tinge to vision, sensitivity to light or blurred sight. Stuffy or .Generic versions of sildenafil, vardenafil and tadalafil are available. Vardenafil is taken only when needed, about 60 minutes before sexual activity. We strive to use primary sources and refrain from using tertiary references. Recent heart or blood vessel problems. In research, a typical dose of Levitra produces a drop of 7 mmHg in systolic blood pressure and 8 mmHg in diastolic blood pressure. Levitra can also interact with alpha-blockers, a type of medications used to treat hypertension high blood pressure and symptoms of benign prostatic hyperplasia BPH. Staxyn vardenafil disintegrating tablets should not be used in place of Levitra vardenafil regular tablets.