These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Do you want a drug that will be effective all weekend? Therefore the use of such treatments in combination with Cialis is not recommended. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. It may be difficult to remain firm despite wanting to have sex. You can report an adverse event either online, by regular mail or by fax, using the contact information at the bottom of this page. Can Cialis be used with other treatments for impotence?Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection. What is tadalafil? Tadalafil is a generic prescription medication. It may be used to treat the following conditions in adults: erectile dysfunction (ED) benign prostatic . What is tadalafil? Tadalafil is a generic prescription medication. It may be used to treat the following conditions in adults: erectile dysfunction (ED) benign prostatic hyperplasia (BPH) pulmonary.