If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Sexual activity may be a strain on your heart, especially if you have heart disease. John’s wort. Talk to your doctor about which dosing schedule is right for you.1. What is Cialis used to treat? Cialis is approved for the treatment of men who experience difficulty having and maintaining an erection (impotence). 2. How does Cialis work? . Tadalafil is its active ingredient and is available as a generic drug. The FDA has approved Cialis to treat ED, symptoms of BPH, or combined ED and BPH in males .  · Description and Brand Names Drug information provided by: Merative, Micromedex ® US Brand Name Adcirca Cialis Descriptions Tadalafil is used to treat .