Levitra may be taken with or without meals. What is Levitra? Common side effects may include: flushing sudden warmth, redness, or tingly feeling ; stuffy nose, sinus pain; upset stomach; or back pain. What are the possible side effects of Levitra? Have low blood pressure or have high blood pressure that is not controlled. If you get an erection that lasts more than 4 hours, get medical help right away. This is not a complete list of side effects and others may occur.About Vardenafil (Levitra) for ED. Levitra (vardenafil hydrochloride) is an oral medication taken to treat erectile dysfunction (ED). It’s in the same class of drugs as other popular ED. Find everything you need to know about Levitra (Vardenafil), including what it is used for, warnings, reviews, side effects, and interactions. Learn more about Levitra (Vardenafil) at.  · General Dose Information. For most patients, the recommended starting dose of LEVITRA is 10 mg, taken orally, as needed, approximately 60 minutes before sexual activity. The dose may be increased to a maximum recommended dose of 20 mg or decreased to 5 mg based on efficacy and side effects.