When the smaller blood vessels in the lungs become more resistant to blood flow, the right ventricle must work harder to pump enough blood through the lungs. Without physical action to the penis, such as that occurring during sexual intercourse, tadalafil will not work to cause an erection. Since Cialis is used as needed, you are not likely to miss a dose. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. It may not be safe to breastfeed while using this medicine. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. The penis is one of the areas where this enzyme works. · What is Cialis? Cialis is a brand-name prescription medication. It’s FDA-approved to treat the following in males:* erectile dysfunction (ED), a condition in which you can’t get or keep an. What is generic Cialis? Generic Cialis is called tadalafil, which is the active ingredient in Cialis. Cialis is Food and Drug Administration (FDA) approved to treat erectile dysfunction. AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping AvailableFree Shipping · Real Doctors · Personalized Plan · Discreet PackagingTypes: Immune Support · Erectile Dysfunction · Sertraline · Testosterone · MEDICATIONS.