These are commonly prescribed for an enlarged prostate or male pattern baldness. Other medications for ED, such as sildenafil , tadalafil and Stendra , offer similar effects to Levitra. Call your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. 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. Follow all directions on your prescription label and read all medication guides or instruction sheets. This boosts blood flow and helps you get an erection from sexual activity.Common side effects of Levitra include facial flushing (reddening), headaches, stomach upset, diarrhea, flu-like symptoms, and nausea. Serious side effects of Levitra include . 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 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 .