Psychological factors like stress, depression, or anxiety can also contribute. Many men want to know how to get prescription ED pills without a doctor or other medical professional. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. A phone or video consultation is sometimes required for legal purposes. For more information, work with a member of our medical team who can order lab tests to look for any critical underlying problems.Compare generic Levitra (vardenafil) prices available at Canadian and international online pharmacies with local U.S. pharmacy coupon prices. The lowest price on test1.ru for generic Levitra (vardenafil) 20 mg is $ per tablet for 90 tablets at PharmacyChecker-accredited online pharmacies. Levitra. Used for Erectile Dysfunction. Vardenafil is a first-choice medication for erectile dysfunction (ED). It’s no longer sold under the brand name Levitra, but it’s available as generic tablets and orally disintegrating tablets (ODTs). Common side effects of vardenafil include headache, flushing, and stuffy nose. Levitra (vardenafil): This medication is taken one hour before sex and can last up to 24 hours. It’s available in 10 mg and 20 mg tablets. Stendra (avanafil): This is an as-needed medication taken 30 minutes before sex and can last up to six hours. It’s available in 50 mg, mg, and mg tablets.