Cialis, the brand name for tadalafil, is a medication primarily used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). It belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors, which work by relaxing the blood vessels, improving blood flow to certain areas of the body.

 

For erectile dysfunction, Cialis helps men achieve and maintain an erection by increasing blood flow to the penis during sexual stimulation. It is unique among ED medications because it can be taken daily in a lower dose or as needed, with effects lasting up to 36 hours, earning it the nickname "the weekend pill."

 

In the treatment of benign prostatic hyperplasia, Cialis helps relieve symptoms such as difficulty in urinating, a weak stream, and the need to urinate frequently or urgently. It works by relaxing the smooth muscles in the bladder and prostate, improving urinary flow.