Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels. Take tadalafil at around the same time every day. FDA encourages anyone aware of a serious side effect, including consumers or patients, to make a MedWatch report. Tadalafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. Can Cialis be used with other treatments for impotence? Cialis Daily helps to prevent erectile dysfunction 24 hours a day. Both Cialis and Viagra work in this way. · Drug Images. 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 Missing: legal. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED) and enlarged prostates, just hit pharmacies. Prices for the generic, Welcome! You’re in GoodRx Provider Mode. Now, you’ll enjoy a streamlined experience created specifically for healthcare providers. Learn more about Provider Mode. close. Health Conditions. Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in those assigned .