Vilitra 10 mg (vardenafil) can cause flushing (warmth or redness of the face/neck) in some people. It's a known side effect of PDE-5 inhibitors such as vardenafil. It happens because vardenafil can cause some blood vessels to relax and widen, increasing blood flow and sometimes producing: Facial warmth/redness Headache Nasal congestion Dizziness Indigestion Flushing is usually mild and temporary. Heavy alcohol use can make flushing and dizziness more noticeable. If flushing is accompanied by fainting, severe dizziness, chest pain, difficulty breathing, or a severe allergic reaction, seek urgent medical attention. Also, don't take vardenafil with nitrate medicines such as nitroglycerin/GTN or isosorbide because of the risk of a dangerous drop in blood pressure.