Cialis is a brand-name prescription medication. It’s FDA-approved to treat the following in men:

erectile dysfunction (ED), a condition in which you can’t get or keep an erection
symptoms of benign prostatic hyperplasia (BPH), a prostate condition that may cause problems with urination
ED and symptoms of BPH together
Cialis comes as a tablet that you swallow. It’s available in four strengths: 2.5 mg, 5 mg, 10 mg, 20 mg.