In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an erection. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis).Interactions What drugs and food should I avoid while taking Levitra Vardenafil? Common side effects may include: flushing sudden warmth, redness, or tingly feeling ; stuffy nose, sinus pain; upset stomach; or back pain. Remove an orally disintegrating Staxyn tablet from the package only when you are ready to use the medicine. Avoid medication errors by using only the form and strength your doctor prescribes. Since vardenafil is used as needed, you are not likely to be on a dosing schedule.Vardenafil can typically work to help an erection occur and last longer for anywhere between. In one study, people who took vardenafil reported that it worked for up to after taking a dose. If your erection lasts for longer than . In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an erection. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis).  · Vardenafil is used to treat men with erectile dysfunction (sexual impotence). It belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly.Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. Call your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. Vardenafil may cause side effects. An erection will not occur just by taking a pill. Avoid consuming grapefruit products and orange marmalades. After you remove the tablet from the blister package, immediately place it on your tongue and close your mouth.