If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately or get emergency medical treatment, and avoid sexual activity until your doctor tells you otherwise. Ask your doctor if you are not sure whether any of your medications contain nitrates. This increased blood flow can cause an erection. Click here for an email preview. Take tadalafil exactly as directed. Brand-name versions of the drug approved for PAH include Adcirca.Tadalafil (Adcirca) is used to improve the ability to exercise in people with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, . Find patient medical information for Cialis oral on MD including its uses, side effects and safety, interactions, pictures, warnings and user ratings.  · 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 erection symptoms of.