Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostate hyperplasia. Learn about alternatives, dosage, side effects, and more. Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Learn about tadalafil (Cialis) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Does Cialis work better than Viagra? Cialis and Viagra are usually considered equally effective. But Cialis tends to work for a longer period than Viagra, lasting up to 36 hours. Prioritize your sexual health with Walgreens Virtual Healthcare. Get online treatments for erectile dysfunction, UTI's, and more from a Doctor or NP. Get erectile dysfunction treatment online at Amazon One Medical. Request prescription for ED pills like sildenafil (Viagra) with 24/7 telehealth care. Some common online retailers include BlueChew, hims, and Roman. Obtaining ED medications from BlueChew or other retailers starts with completing an online form, available on the company's website or through an app that you download.