If you mean which brand of vardenafil 20 mg has fewer side effects, there isn't good evidence that one legitimate brand of vardenafil 20 mg has fewer side effects than another. The active drug and dose are what matter most. Vilitra 20 contains vardenafil 20 mg. 1 1mg +1 To reduce side effects: 20 mg is the highest usual vardenafil dose; 10 mg may cause fewer side effects while still working for many men. Common effects include headache, flushing, stuffy nose, indigestion, dizziness and visual changes. 1 1mg Don't combine it with nitrates or other ED medicines. Avoid taking more than one dose in 24 hours. If you've had side effects from Vilitra 10, tell me which side effect you experienced (headache, dizziness, flushing, vision changes, etc.). I can suggest which ED medicine/dose is generally less likely to cause that particular problem.