Filitra 20 is a drug containing the active ingredient vardenafil, which is used to treat erectile dysfunction in men. It may cause some side effects like headache, dizziness and back pain. Therefore, it is important to avoid Filitra if you have any allergies or have consumed alcohol or grapefruit juice before taking it. Furthermore, Filitra Professional should be taken only after consulting with a doctor as its active ingredient might interact with other drugs and increase the blood levels of vardenafil.