Vardenafil usually works for 4 to 5 hours. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. When a man is sexually stimulated, his body’s normal response is to increase blood flow to his penis to produce an erection. What Is Cialis? Though this growth is not cancerous, prostate cancer and BPH can co-occur.Cialis is used for the treatment of erectile dysfunction (ED). It increases blood flow to the penis following sexual stimulation and allows men to keep an erection hard enough for . The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 . Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Another brand of tadalafil is Adcirca, which is used to .